2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1771
The ECM detects that the TP sensor 1 voltage is greater than 4.75 V for greater than 1 s.
P0220
The TP sensor 2 voltage is less than 0.25 V or greater than 4.59 V for greater than 1 s.
P0222
The ECM detects that the TP sensor 2 voltage is less than 0.25 V for greater than 1 s.
P0223
The ECM detects that the TP sensor 2 voltage is greater than 4.59 V for greater than 1 s.
P2135
The difference between the TP sensor 1 and TP sensor 2 exceeds a predetermined value for greater than 2 s.
Action Taken When the DTC Sets
* DTC P0120, P0122, P0123, P0220, P0222, P0223, and P2135 are Type A DTCs.
* The control module commands the TAC system to operate in the Reduced Engine Power mode.
* A message center or an indicator displays Reduced Engine Power.
* Under certain conditions the control module commands the engine OFF.
Conditions for Clearing the MIL/DTC
DTCs P0120, P0122, P0123, P0220, P0222, P0223, and P2135 are Type A DTCs.
Diagnostic Aids
* If the Throttle Sweep Test is not available on the scan tool, observe the scan tool TP Sensor 1 and 2 Agree/Disagree parameter while
performing the following tests:
- Slowly depress the accelerator pedal to WOT and then slowly return the pedal to closed throttle. Repeat the procedure several times.
- Rapidly depress the accelerator pedal from the rest position to the wide open throttle position (WOT) and release pedal. Repeat the
procedure several times.
The TP Sensor 1 and 2 Agree/Disagree parameter should display Agree. If Disagree is displayed, continue diagnosis in Circuit/System
Testing.
* A high resistance condition on the throttle position and throttle actuator control circuits could cause a DTC to set.
Reference Information
Schematic Reference
Engine Controls Schematics (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Throttle Actuator Control (TAC) System Description (See: Powertrain Management/Computers and Control Systems/Description and
Operation/Throttle Actuator Control (TAC) System Description)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code
(DTC) Type Definitions)
Saturday, October 31, 2020
2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1770
2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1770
DTC P0223
- Throttle Position (TP) Sensor 2 Circuit High Voltage
DTC P2135
- Throttle Position (TP) Sensor 1-2 Correlation
Diagnostic Fault Information
Typical Scan Tool Data
Circuit/System Description
The throttle body assembly contains 2 throttle position (TP) sensors. The TP sensors are mounted to the throttle body assembly and are not
serviceable. The TP sensors provide a signal voltage that changes relative to throttle blade angle. The engine control module (ECM) supplies the TP
sensors with a common 5 V reference circuit, a common low reference circuit, and two independent signal circuits.
The TP sensors have opposite functionality. TP sensor 1 signal voltage decreases and TP sensor 2 signal voltage increases as the accelerator pedal
increases to wide open throttle (WOT).
Conditions for Running the DTC
* DTC P0641 or P0651 is not set.
* The run/crank or powertrain relay voltage is greater than 6 V and reduced power is not active.
* The ignition is ON or the engine is operating.
* DTC P0120, P0122, P0123, P0220, P0222, P0223, P2135 run continuously when the above conditions are met.
Conditions for Setting the DTC
P0120
TP sensor 1 voltage is less than 0.325 V or greater than 4.75 V for greater than 1 s.
P0122
The ECM detects that the TP sensor 1 voltage is less than 0.325 V for greater than 1 s.
DTC P0223
- Throttle Position (TP) Sensor 2 Circuit High Voltage
DTC P2135
- Throttle Position (TP) Sensor 1-2 Correlation
Diagnostic Fault Information
Typical Scan Tool Data
Circuit/System Description
The throttle body assembly contains 2 throttle position (TP) sensors. The TP sensors are mounted to the throttle body assembly and are not
serviceable. The TP sensors provide a signal voltage that changes relative to throttle blade angle. The engine control module (ECM) supplies the TP
sensors with a common 5 V reference circuit, a common low reference circuit, and two independent signal circuits.
The TP sensors have opposite functionality. TP sensor 1 signal voltage decreases and TP sensor 2 signal voltage increases as the accelerator pedal
increases to wide open throttle (WOT).
Conditions for Running the DTC
* DTC P0641 or P0651 is not set.
* The run/crank or powertrain relay voltage is greater than 6 V and reduced power is not active.
* The ignition is ON or the engine is operating.
* DTC P0120, P0122, P0123, P0220, P0222, P0223, P2135 run continuously when the above conditions are met.
Conditions for Setting the DTC
P0120
TP sensor 1 voltage is less than 0.325 V or greater than 4.75 V for greater than 1 s.
P0122
The ECM detects that the TP sensor 1 voltage is less than 0.325 V for greater than 1 s.
2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1769
2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1769
3. Turn ON the ignition, with the engine OFF.
4. Use the scan tool to verify the proper operation of the engine cooling system fans.
5. Turn OFF the ignition.
6. Verify the proper heat range, and the operation of the thermostat. Refer to Thermostat Diagnosis (See: Engine, Cooling and
Exhaust/Cooling System/Testing and Inspection/Symptom Related Diagnostic Procedures/Thermostat Diagnosis).
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the B34 ECT sensor.
2. Ignition OFF for 90 s, test for less than 5 ohm between the low reference circuit terminal A and ground.
瀚慖f greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20
ECM.
3. Ignition ON, verify the scan tool ECT parameter is colder than -39掳C (-38掳F).
瀚慖f greater than the specified range, test the signal circuit terminal B for a short to ground. If the circuit tests normal, replace the K20 ECM.
4. Install a 3 A fused jumper wire between the signal circuit terminal B and the low reference circuit terminal A. Verify the scan tool ECT
parameter is greater than 149掳C (300掳F).
瀚慖f less than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace
the K20 ECM.
5. If all circuits test normal, test or replace the B34 ECT sensor.
Component Testing
Measure and record the resistance of the ECT sensor at various ambient temperatures, then compare those measurements to the Temperature vs
Resistance table. Refer to Temperature Versus Resistance (See: Powertrain Management/Computers and Control
Systems/Specifications/Temperature Versus Resistance).
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Engine Coolant Temperature Sensor Replacement (See: Engine, Cooling and Exhaust/Cooling System/Engine - Coolant Temperature
Sensor/Switch/Coolant Temperature Sensor/Switch (For Computer)/Service and Repair)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, setup, and programming
P0120
DTC P0120, P0122, P0123, P0220, P0222, P0223, or P2135
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC P0120
- Throttle Position (TP) Sensor 1 Circuit
DTC P0122
- Throttle Position (TP) Sensor 1 Circuit Low Voltage
DTC P0123
- Throttle Position (TP) Sensor 1 Circuit High Voltage
DTC P0220
- Throttle Position (TP) Sensor 2 Circuit
DTC P0222
- Throttle Position (TP) Sensor 2 Circuit Low Voltage
3. Turn ON the ignition, with the engine OFF.
4. Use the scan tool to verify the proper operation of the engine cooling system fans.
5. Turn OFF the ignition.
6. Verify the proper heat range, and the operation of the thermostat. Refer to Thermostat Diagnosis (See: Engine, Cooling and
Exhaust/Cooling System/Testing and Inspection/Symptom Related Diagnostic Procedures/Thermostat Diagnosis).
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the B34 ECT sensor.
2. Ignition OFF for 90 s, test for less than 5 ohm between the low reference circuit terminal A and ground.
瀚慖f greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20
ECM.
3. Ignition ON, verify the scan tool ECT parameter is colder than -39掳C (-38掳F).
瀚慖f greater than the specified range, test the signal circuit terminal B for a short to ground. If the circuit tests normal, replace the K20 ECM.
4. Install a 3 A fused jumper wire between the signal circuit terminal B and the low reference circuit terminal A. Verify the scan tool ECT
parameter is greater than 149掳C (300掳F).
瀚慖f less than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace
the K20 ECM.
5. If all circuits test normal, test or replace the B34 ECT sensor.
Component Testing
Measure and record the resistance of the ECT sensor at various ambient temperatures, then compare those measurements to the Temperature vs
Resistance table. Refer to Temperature Versus Resistance (See: Powertrain Management/Computers and Control
Systems/Specifications/Temperature Versus Resistance).
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Engine Coolant Temperature Sensor Replacement (See: Engine, Cooling and Exhaust/Cooling System/Engine - Coolant Temperature
Sensor/Switch/Coolant Temperature Sensor/Switch (For Computer)/Service and Repair)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, setup, and programming
P0120
DTC P0120, P0122, P0123, P0220, P0222, P0223, or P2135
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC P0120
- Throttle Position (TP) Sensor 1 Circuit
DTC P0122
- Throttle Position (TP) Sensor 1 Circuit Low Voltage
DTC P0123
- Throttle Position (TP) Sensor 1 Circuit High Voltage
DTC P0220
- Throttle Position (TP) Sensor 2 Circuit
DTC P0222
- Throttle Position (TP) Sensor 2 Circuit Low Voltage
2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1768
2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1768
P0117
* The engine is running for greater than 10 s.
OR
* The ignition is ON when the intake air temperature (IAT) is less than 50掳C (122掳F).
* This DTC runs continuously when the above conditions are met.
P0118
* The engine is running for greater than 10 s.
OR
* The ignition is ON when the IAT is greater than 0掳C (32掳F).
* This DTC runs continuously when the above conditions are met.
Conditions for Setting the DTC
P0117
The ECM detects that the ECT is warmer than 150掳C (302掳F) for greater than 5 s.
P0118
The ECM detects that the ECT is colder than -60掳C (-76掳F) for greater than 5 s.
Action Taken When the DTC Sets
DTCs P0117 and P0118 are Type B DTCs.
Conditions for Clearing the MIL/DTC
DTCs P0117 and P0118 are Type B DTCs.
Reference Information
Schematic Reference
Engine Controls Schematics (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code
(DTC) Type Definitions)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Verification
Warning
Under pressure, the temperature of the solution in the radiator can be considerably higher, without boiling. Removing the radiator cap while the
engine is hot (pressure is high), will cause the solution to boil instantaneously, with explosive force. The solution will spew out over the engine,
fenders, and the person removing the cap. Serious bodily injury may result. Flammable antifreeze, such as alcohol, is not recommended for use at
any time. Flammable antifreeze could cause a serious fire.
1. Turn OFF the ignition.
2. Inspect the cooling system surge tank for the proper engine coolant level. Refer to Cooling System Leak Testing (See: Engine, Cooling and
Exhaust/Cooling System/Testing and Inspection/Component Tests and General Diagnostics) and Cooling System Draining and Filling (Static
Fill) (See: Engine, Cooling and Exhaust/Cooling System/Service and Repair/Cooling System Draining and Filling (Static Fill)).
P0117
* The engine is running for greater than 10 s.
OR
* The ignition is ON when the intake air temperature (IAT) is less than 50掳C (122掳F).
* This DTC runs continuously when the above conditions are met.
P0118
* The engine is running for greater than 10 s.
OR
* The ignition is ON when the IAT is greater than 0掳C (32掳F).
* This DTC runs continuously when the above conditions are met.
Conditions for Setting the DTC
P0117
The ECM detects that the ECT is warmer than 150掳C (302掳F) for greater than 5 s.
P0118
The ECM detects that the ECT is colder than -60掳C (-76掳F) for greater than 5 s.
Action Taken When the DTC Sets
DTCs P0117 and P0118 are Type B DTCs.
Conditions for Clearing the MIL/DTC
DTCs P0117 and P0118 are Type B DTCs.
Reference Information
Schematic Reference
Engine Controls Schematics (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code
(DTC) Type Definitions)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Verification
Warning
Under pressure, the temperature of the solution in the radiator can be considerably higher, without boiling. Removing the radiator cap while the
engine is hot (pressure is high), will cause the solution to boil instantaneously, with explosive force. The solution will spew out over the engine,
fenders, and the person removing the cap. Serious bodily injury may result. Flammable antifreeze, such as alcohol, is not recommended for use at
any time. Flammable antifreeze could cause a serious fire.
1. Turn OFF the ignition.
2. Inspect the cooling system surge tank for the proper engine coolant level. Refer to Cooling System Leak Testing (See: Engine, Cooling and
Exhaust/Cooling System/Testing and Inspection/Component Tests and General Diagnostics) and Cooling System Draining and Filling (Static
Fill) (See: Engine, Cooling and Exhaust/Cooling System/Service and Repair/Cooling System Draining and Filling (Static Fill)).
2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1767
2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1767
4. Install a 3 A fused jumper wire between the signal circuit terminal B and the low reference circuit terminal A. Verify the scan tool ECT
parameter is greater than 149掳C (300掳F).
瀚慖f less than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace
the K20 ECM.
5. If all circuits test normal, test or replace the B34 ECT sensor.
Component Testing
Measure and record the resistance of the ECT sensor at various ambient temperatures, then compare those measurements to the Temperature vs
Resistance table. Refer to Temperature Versus Resistance (See: Powertrain Management/Computers and Control
Systems/Specifications/Temperature Versus Resistance).
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Engine Coolant Temperature Sensor Replacement (See: Engine, Cooling and Exhaust/Cooling System/Engine - Coolant Temperature
Sensor/Switch/Coolant Temperature Sensor/Switch (For Computer)/Service and Repair)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, setup, and programming
P0118
DTC P0117 or P0118 (Without L96)
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC P0117
- Engine Coolant Temperature (ECT) Sensor Circuit Low Voltage
DTC P0118
- Engine Coolant Temperature (ECT) Sensor Circuit High Voltage
Diagnostic Fault Information
Typical Scan Tool Data
Circuit/System Description
The engine coolant temperature (ECT) sensor is a variable resistor that measures the temperature of the engine coolant. The engine control module
(ECM) supplies 5 V to the ECT signal circuit and supplies a ground to the low reference circuit.
Conditions for Running the DTC
4. Install a 3 A fused jumper wire between the signal circuit terminal B and the low reference circuit terminal A. Verify the scan tool ECT
parameter is greater than 149掳C (300掳F).
瀚慖f less than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace
the K20 ECM.
5. If all circuits test normal, test or replace the B34 ECT sensor.
Component Testing
Measure and record the resistance of the ECT sensor at various ambient temperatures, then compare those measurements to the Temperature vs
Resistance table. Refer to Temperature Versus Resistance (See: Powertrain Management/Computers and Control
Systems/Specifications/Temperature Versus Resistance).
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Engine Coolant Temperature Sensor Replacement (See: Engine, Cooling and Exhaust/Cooling System/Engine - Coolant Temperature
Sensor/Switch/Coolant Temperature Sensor/Switch (For Computer)/Service and Repair)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, setup, and programming
P0118
DTC P0117 or P0118 (Without L96)
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC P0117
- Engine Coolant Temperature (ECT) Sensor Circuit Low Voltage
DTC P0118
- Engine Coolant Temperature (ECT) Sensor Circuit High Voltage
Diagnostic Fault Information
Typical Scan Tool Data
Circuit/System Description
The engine coolant temperature (ECT) sensor is a variable resistor that measures the temperature of the engine coolant. The engine control module
(ECM) supplies 5 V to the ECT signal circuit and supplies a ground to the low reference circuit.
Conditions for Running the DTC
2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1766
2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1766
P0118
The ECM detects that the ECT is colder than -60掳C (-76掳F) for greater than 5 s.
Action Taken When the DTC Sets
DTCs P0117 and P0118 are Type B DTCs.
Conditions for Clearing the MIL/DTC
DTCs P0117 and P0118 are Type B DTCs.
Reference Information
Schematic Reference
Engine Controls Schematics (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code
(DTC) Type Definitions)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Verification
Warning
Under pressure, the temperature of the solution in the radiator can be considerably higher, without boiling. Removing the radiator cap while the
engine is hot (pressure is high), will cause the solution to boil instantaneously, with explosive force. The solution will spew out over the engine,
fenders, and the person removing the cap. Serious bodily injury may result. Flammable antifreeze, such as alcohol, is not recommended for use at
any time. Flammable antifreeze could cause a serious fire.
1. Turn OFF the ignition.
2. Inspect the cooling system surge tank for the proper engine coolant level. Refer to Cooling System Leak Testing (See: Engine, Cooling and
Exhaust/Cooling System/Testing and Inspection/Component Tests and General Diagnostics) and Cooling System Draining and Filling (Static
Fill) (See: Engine, Cooling and Exhaust/Cooling System/Service and Repair/Cooling System Draining and Filling (Static Fill)).
3. Turn ON the ignition, with the engine OFF.
4. Use the scan tool to verify the proper operation of the engine cooling system fans.
5. Turn OFF the ignition.
6. Verify the proper heat range, and the operation of the thermostat. Refer to Thermostat Diagnosis (See: Engine, Cooling and
Exhaust/Cooling System/Testing and Inspection/Symptom Related Diagnostic Procedures/Thermostat Diagnosis).
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the B34 ECT sensor.
2. Ignition OFF for 90 s, test for less than 5 ohm between the low reference circuit terminal A and ground.
瀚慖f greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20
ECM.
3. Ignition ON, verify the scan tool ECT parameter is colder than -39掳C (-38掳F).
瀚慖f greater than the specified range, test the signal circuit terminal B for a short to ground. If the circuit tests normal, replace the K20 ECM.
P0118
The ECM detects that the ECT is colder than -60掳C (-76掳F) for greater than 5 s.
Action Taken When the DTC Sets
DTCs P0117 and P0118 are Type B DTCs.
Conditions for Clearing the MIL/DTC
DTCs P0117 and P0118 are Type B DTCs.
Reference Information
Schematic Reference
Engine Controls Schematics (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code
(DTC) Type Definitions)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Verification
Warning
Under pressure, the temperature of the solution in the radiator can be considerably higher, without boiling. Removing the radiator cap while the
engine is hot (pressure is high), will cause the solution to boil instantaneously, with explosive force. The solution will spew out over the engine,
fenders, and the person removing the cap. Serious bodily injury may result. Flammable antifreeze, such as alcohol, is not recommended for use at
any time. Flammable antifreeze could cause a serious fire.
1. Turn OFF the ignition.
2. Inspect the cooling system surge tank for the proper engine coolant level. Refer to Cooling System Leak Testing (See: Engine, Cooling and
Exhaust/Cooling System/Testing and Inspection/Component Tests and General Diagnostics) and Cooling System Draining and Filling (Static
Fill) (See: Engine, Cooling and Exhaust/Cooling System/Service and Repair/Cooling System Draining and Filling (Static Fill)).
3. Turn ON the ignition, with the engine OFF.
4. Use the scan tool to verify the proper operation of the engine cooling system fans.
5. Turn OFF the ignition.
6. Verify the proper heat range, and the operation of the thermostat. Refer to Thermostat Diagnosis (See: Engine, Cooling and
Exhaust/Cooling System/Testing and Inspection/Symptom Related Diagnostic Procedures/Thermostat Diagnosis).
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the B34 ECT sensor.
2. Ignition OFF for 90 s, test for less than 5 ohm between the low reference circuit terminal A and ground.
瀚慖f greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20
ECM.
3. Ignition ON, verify the scan tool ECT parameter is colder than -39掳C (-38掳F).
瀚慖f greater than the specified range, test the signal circuit terminal B for a short to ground. If the circuit tests normal, replace the K20 ECM.
2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1765
2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1765
* Engine Coolant Temperature Sensor Replacement (See: Engine, Cooling and Exhaust/Cooling System/Engine - Coolant Temperature
Sensor/Switch/Coolant Temperature Sensor/Switch (For Computer)/Service and Repair)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, setup, and programming
P0117
DTC P0117 or P0118 (Without L96)
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC P0117
- Engine Coolant Temperature (ECT) Sensor Circuit Low Voltage
DTC P0118
- Engine Coolant Temperature (ECT) Sensor Circuit High Voltage
Diagnostic Fault Information
Typical Scan Tool Data
Circuit/System Description
The engine coolant temperature (ECT) sensor is a variable resistor that measures the temperature of the engine coolant. The engine control module
(ECM) supplies 5 V to the ECT signal circuit and supplies a ground to the low reference circuit.
Conditions for Running the DTC
P0117
* The engine is running for greater than 10 s.
OR
* The ignition is ON when the intake air temperature (IAT) is less than 50掳C (122掳F).
* This DTC runs continuously when the above conditions are met.
P0118
* The engine is running for greater than 10 s.
OR
* The ignition is ON when the IAT is greater than 0掳C (32掳F).
* This DTC runs continuously when the above conditions are met.
Conditions for Setting the DTC
P0117
The ECM detects that the ECT is warmer than 150掳C (302掳F) for greater than 5 s.
* Engine Coolant Temperature Sensor Replacement (See: Engine, Cooling and Exhaust/Cooling System/Engine - Coolant Temperature
Sensor/Switch/Coolant Temperature Sensor/Switch (For Computer)/Service and Repair)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, setup, and programming
P0117
DTC P0117 or P0118 (Without L96)
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC P0117
- Engine Coolant Temperature (ECT) Sensor Circuit Low Voltage
DTC P0118
- Engine Coolant Temperature (ECT) Sensor Circuit High Voltage
Diagnostic Fault Information
Typical Scan Tool Data
Circuit/System Description
The engine coolant temperature (ECT) sensor is a variable resistor that measures the temperature of the engine coolant. The engine control module
(ECM) supplies 5 V to the ECT signal circuit and supplies a ground to the low reference circuit.
Conditions for Running the DTC
P0117
* The engine is running for greater than 10 s.
OR
* The ignition is ON when the intake air temperature (IAT) is less than 50掳C (122掳F).
* This DTC runs continuously when the above conditions are met.
P0118
* The engine is running for greater than 10 s.
OR
* The ignition is ON when the IAT is greater than 0掳C (32掳F).
* This DTC runs continuously when the above conditions are met.
Conditions for Setting the DTC
P0117
The ECM detects that the ECT is warmer than 150掳C (302掳F) for greater than 5 s.
2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1764
2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1764
Schematic Reference
Engine Controls Schematics (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code
(DTC) Type Definitions)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Verification
1. Ignition OFF, inspect the cooling system surge tank for the proper coolant level. Refer to Cooling System Leak Testing (See: Engine,
Cooling and Exhaust/Cooling System/Testing and Inspection/Component Tests and General Diagnostics) and Cooling System Draining and
Filling (Static Fill) (See: Engine, Cooling and Exhaust/Cooling System/Service and Repair/Cooling System Draining and Filling (Static Fill)
).
2. Inspect the thermostatically-controlled coolant heater, if equipped, for damage or modifications. Test for proper operation of the coolant
heater. Refer to Coolant Heater Inoperative (See: Engine, Cooling and Exhaust/Cooling System/Testing and Inspection/Symptom Related
Diagnostic Procedures/Coolant Heater Inoperative).
3. Ignition OFF for 8 h or greater.
4. Ignition ON, observe the scan tool IAT and ECT sensor parameters. The ECT, IAT, and ambient temperature should be within 6掳C (11掳F) of
each other.
5. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the
conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the B34 ECT sensor.
2. Ignition OFF for 90 s, test for less than 5 ohm between the low reference circuit terminal A and ground.
瀚慖f greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20
ECM.
3. Ignition ON, verify the scan tool ECT parameter is colder than -39掳C (-38掳F).
瀚慖f greater than the specified range, test the signal circuit terminal B for a short to ground. If the circuit tests normal, replace the K20 ECM.
4. Install a 3 A fused jumper wire between the signal circuit terminal B and the low reference circuit terminal A. Verify the scan tool ECT
parameter is greater than 149掳C (300掳F).
瀚慖f less than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace
the K20 ECM.
5. If all circuits test normal, test or replace the B34 ECT sensor.
6. Inspect for the proper operation of the OEM block heater cord by verifying that the thermostat has turned OFF the heater at temperatures
warmer than -10掳 (+14掳F).
Component Testing
Measure and record the resistance of the ECT sensor at various ambient temperatures, then compare those measurements to the Temperature Versus
Resistance (See: Powertrain Management/Computers and Control Systems/Specifications/Temperature Versus Resistance).
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
Schematic Reference
Engine Controls Schematics (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code
(DTC) Type Definitions)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Verification
1. Ignition OFF, inspect the cooling system surge tank for the proper coolant level. Refer to Cooling System Leak Testing (See: Engine,
Cooling and Exhaust/Cooling System/Testing and Inspection/Component Tests and General Diagnostics) and Cooling System Draining and
Filling (Static Fill) (See: Engine, Cooling and Exhaust/Cooling System/Service and Repair/Cooling System Draining and Filling (Static Fill)
).
2. Inspect the thermostatically-controlled coolant heater, if equipped, for damage or modifications. Test for proper operation of the coolant
heater. Refer to Coolant Heater Inoperative (See: Engine, Cooling and Exhaust/Cooling System/Testing and Inspection/Symptom Related
Diagnostic Procedures/Coolant Heater Inoperative).
3. Ignition OFF for 8 h or greater.
4. Ignition ON, observe the scan tool IAT and ECT sensor parameters. The ECT, IAT, and ambient temperature should be within 6掳C (11掳F) of
each other.
5. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the
conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the B34 ECT sensor.
2. Ignition OFF for 90 s, test for less than 5 ohm between the low reference circuit terminal A and ground.
瀚慖f greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20
ECM.
3. Ignition ON, verify the scan tool ECT parameter is colder than -39掳C (-38掳F).
瀚慖f greater than the specified range, test the signal circuit terminal B for a short to ground. If the circuit tests normal, replace the K20 ECM.
4. Install a 3 A fused jumper wire between the signal circuit terminal B and the low reference circuit terminal A. Verify the scan tool ECT
parameter is greater than 149掳C (300掳F).
瀚慖f less than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace
the K20 ECM.
5. If all circuits test normal, test or replace the B34 ECT sensor.
6. Inspect for the proper operation of the OEM block heater cord by verifying that the thermostat has turned OFF the heater at temperatures
warmer than -10掳 (+14掳F).
Component Testing
Measure and record the resistance of the ECT sensor at various ambient temperatures, then compare those measurements to the Temperature Versus
Resistance (See: Powertrain Management/Computers and Control Systems/Specifications/Temperature Versus Resistance).
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1763
2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1763
DTC P0116
- Engine Coolant Temperature (ECT) Sensor Performance
Diagnostic Fault Information
Typical Scan Tool Data
Circuit/System Description
The engine coolant temperature (ECT) sensor is a variable resistor that measures the temperature of the engine coolant. The engine control module
(ECM) supplies 5 V to the ECT sensor signal circuit, and supplies a ground to the low reference circuit. The ECM uses this high side coolant
rationality diagnostic to determine if the input from the ECT sensor is skewed warmer than normal. The internal clock of the ECM will record the
amount of time the ignition is OFF. If the calibrated ignition OFF timer is met at start-up, the ECM will compare the temperature difference
between the ECT and the intake air temperature (IAT), to determine if the temperatures are within an acceptable operating range of each other.
Conditions for Running the DTC
* DTCs P0112, P0113, P0117, P0118, P0502, P0503, P0601, P0603, P062F, P2610 are not set.
* The vehicle has had a minimum ignition OFF time of 8 h.
* The ignition is ON.
* The start-up IAT is greater than -7掳C (+19掳F).
* The Fuel Level Sensor is greater than 5 %.
* This DTC runs once per cold start when the above conditions are met.
Conditions for Setting the DTC
* The ECM detects a temperature difference at power-up that indicates that the ECT sensor is 30掳C (54掳F) greater than the IAT sensor.
OR
* The ECM detects a temperature difference at power-up that indicates that the ECT sensor is 10掳C (18掳F) greater than the IAT sensor, and the
time spent cranking the engine is greater than 10 s, when the fuel level is greater than 5 %.
OR
* With the power-up IAT more than -7掳C (+19掳F), the ECM detects a temperature difference at power-up that indicates that the ECT sensor is
20掳C (36掳F) greater than the IAT sensor. Then the vehicle must be driven for more than 6 min and 40 s at greater than 40 km/h (25 mph). If
the IAT sensor then decreases greater than 4掳C (7掳F), an engine block heater was detected and the test is aborted. If the IAT sensor does not
decrease, an engine block heater was not detected and DTC P0116 will set.
Action Taken When the DTC Sets
DTC P0116 is a Type B DTC.
Conditions for Clearing the MIL/DTC
DTC P0116 is a Type B DTC.
Diagnostic Aids
* The use of non-thermostatically controlled aftermarket block heater will cause this DTC to set.
* Inspect the ECT sensor terminals for corrosion and for engine coolant leaking through the sensor. Engine coolant that is leaking through the
sensor will create a high resistance short to ground. This condition results in less voltage on the ECT sensor signal circuit, which is
interpreted by the ECM as a warmer ECT.
* An IAT sensor that is skewed colder at various ambient temperatures due to greater resistance than is normal will increase the range between
these two sensors. Measure and record the resistance of the IAT sensor at various ambient temperatures, then compare those measurements to
the Temperature vs Resistance table. Refer to Temperature Versus Resistance (See: Powertrain Management/Computers and Control
Systems/Specifications/Temperature Versus Resistance).
* A slight to moderate resistance in the IAT sensor signal circuit or low reference circuit will increase the range between these two sensors.
This condition results in a greater voltage on the IAT sensor signal circuit, which is interpreted by the ECM as a colder IAT.
DTC P0116
- Engine Coolant Temperature (ECT) Sensor Performance
Diagnostic Fault Information
Typical Scan Tool Data
Circuit/System Description
The engine coolant temperature (ECT) sensor is a variable resistor that measures the temperature of the engine coolant. The engine control module
(ECM) supplies 5 V to the ECT sensor signal circuit, and supplies a ground to the low reference circuit. The ECM uses this high side coolant
rationality diagnostic to determine if the input from the ECT sensor is skewed warmer than normal. The internal clock of the ECM will record the
amount of time the ignition is OFF. If the calibrated ignition OFF timer is met at start-up, the ECM will compare the temperature difference
between the ECT and the intake air temperature (IAT), to determine if the temperatures are within an acceptable operating range of each other.
Conditions for Running the DTC
* DTCs P0112, P0113, P0117, P0118, P0502, P0503, P0601, P0603, P062F, P2610 are not set.
* The vehicle has had a minimum ignition OFF time of 8 h.
* The ignition is ON.
* The start-up IAT is greater than -7掳C (+19掳F).
* The Fuel Level Sensor is greater than 5 %.
* This DTC runs once per cold start when the above conditions are met.
Conditions for Setting the DTC
* The ECM detects a temperature difference at power-up that indicates that the ECT sensor is 30掳C (54掳F) greater than the IAT sensor.
OR
* The ECM detects a temperature difference at power-up that indicates that the ECT sensor is 10掳C (18掳F) greater than the IAT sensor, and the
time spent cranking the engine is greater than 10 s, when the fuel level is greater than 5 %.
OR
* With the power-up IAT more than -7掳C (+19掳F), the ECM detects a temperature difference at power-up that indicates that the ECT sensor is
20掳C (36掳F) greater than the IAT sensor. Then the vehicle must be driven for more than 6 min and 40 s at greater than 40 km/h (25 mph). If
the IAT sensor then decreases greater than 4掳C (7掳F), an engine block heater was detected and the test is aborted. If the IAT sensor does not
decrease, an engine block heater was not detected and DTC P0116 will set.
Action Taken When the DTC Sets
DTC P0116 is a Type B DTC.
Conditions for Clearing the MIL/DTC
DTC P0116 is a Type B DTC.
Diagnostic Aids
* The use of non-thermostatically controlled aftermarket block heater will cause this DTC to set.
* Inspect the ECT sensor terminals for corrosion and for engine coolant leaking through the sensor. Engine coolant that is leaking through the
sensor will create a high resistance short to ground. This condition results in less voltage on the ECT sensor signal circuit, which is
interpreted by the ECM as a warmer ECT.
* An IAT sensor that is skewed colder at various ambient temperatures due to greater resistance than is normal will increase the range between
these two sensors. Measure and record the resistance of the IAT sensor at various ambient temperatures, then compare those measurements to
the Temperature vs Resistance table. Refer to Temperature Versus Resistance (See: Powertrain Management/Computers and Control
Systems/Specifications/Temperature Versus Resistance).
* A slight to moderate resistance in the IAT sensor signal circuit or low reference circuit will increase the range between these two sensors.
This condition results in a greater voltage on the IAT sensor signal circuit, which is interpreted by the ECM as a colder IAT.
2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1762
2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1762
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code
(DTC) Type Definitions)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Verification
1. Engine idling, observe the scan tool IAT Sensor parameter. The reading should be between -38 to +149掳C (-36 to +300F) depending on the
current ambient temperature and the vehicle operating conditions.
2. Operate the vehicle within the Conditions for Running the DTC to verify that the DTC does not reset. You may also operate the vehicle
within the conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the MAF/IAT sensor.
2. Ignition OFF, all vehicles systems OFF, this may take up to for 2 min, test for less than 5 ohm between the IAT low reference circuit terminal
A and ground.
瀚慖f greater than the specified range, test the IAT low reference circuit for an open/high resistance. If the circuit tests normal, replace the
ECM.
3. Ignition ON, verify the scan tool IAT parameter is colder than -39掳C (-38掳F).
瀚慖f warmer than the specified range, test the IAT signal circuit terminal B for a short to ground. If the circuit tests normal, replace the
ECM.
4. Install a 3 A fused jumper wire between the IAT signal circuit terminal B and ground. Verify the scan tool IAT parameter is warmer than 149
掳C (300掳F).
瀚慖f colder than the specified range, test the IAT signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal,
replace the ECM.
5. If all circuits test normal, test or replace the MAF/IAT sensor.
Component Testing
Measure and record the resistance of the IAT sensor at various ambient temperatures, and then compare those measurements to the Temperature
Versus Resistance (See: Powertrain Management/Computers and Control Systems/Specifications/Temperature Versus Resistance) table.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Mass Airflow Sensor with Intake Air Temperature Sensor Replacement (See: Powertrain Management/Computers and Control Systems/Air
Flow Meter/Sensor/Service and Repair)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, programming, and setup
P0116
DTC P0116 (Without L96)
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code
(DTC) Type Definitions)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Verification
1. Engine idling, observe the scan tool IAT Sensor parameter. The reading should be between -38 to +149掳C (-36 to +300F) depending on the
current ambient temperature and the vehicle operating conditions.
2. Operate the vehicle within the Conditions for Running the DTC to verify that the DTC does not reset. You may also operate the vehicle
within the conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the MAF/IAT sensor.
2. Ignition OFF, all vehicles systems OFF, this may take up to for 2 min, test for less than 5 ohm between the IAT low reference circuit terminal
A and ground.
瀚慖f greater than the specified range, test the IAT low reference circuit for an open/high resistance. If the circuit tests normal, replace the
ECM.
3. Ignition ON, verify the scan tool IAT parameter is colder than -39掳C (-38掳F).
瀚慖f warmer than the specified range, test the IAT signal circuit terminal B for a short to ground. If the circuit tests normal, replace the
ECM.
4. Install a 3 A fused jumper wire between the IAT signal circuit terminal B and ground. Verify the scan tool IAT parameter is warmer than 149
掳C (300掳F).
瀚慖f colder than the specified range, test the IAT signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal,
replace the ECM.
5. If all circuits test normal, test or replace the MAF/IAT sensor.
Component Testing
Measure and record the resistance of the IAT sensor at various ambient temperatures, and then compare those measurements to the Temperature
Versus Resistance (See: Powertrain Management/Computers and Control Systems/Specifications/Temperature Versus Resistance) table.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Mass Airflow Sensor with Intake Air Temperature Sensor Replacement (See: Powertrain Management/Computers and Control Systems/Air
Flow Meter/Sensor/Service and Repair)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, programming, and setup
P0116
DTC P0116 (Without L96)
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1761
2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1761
Circuit/System Description
The intake air temperature (IAT) sensor, a part of the mass air flow (MAF) sensor assembly, is a variable resistor. The IAT sensor has a signal
circuit and a low reference circuit. The IAT sensor measures the temperature of the air entering the engine. The engine control module (ECM)
supplies 5 V to the IAT signal circuit, and a ground for the IAT low reference circuit.
Conditions for Running the DTC
P0112
* DTCs P0116, P0117, P0118, P0125, P0128, P0722, P0723 are not set.
* The engine is running for greater than 10 s.
* The engine coolant temperature (ECT) is colder than 150掳C (302掳F).
* This DTC runs continuously when the above conditions are met.
P0113
* DTCs P0101, P0102, P0103, P0116, P0117, P0118, P0125, P0128, P0722, P0723 are not set.
* The engine is running for greater than 10 s.
* The ECT is warmer than -40掳C (-40掳F).
* The MAF Sensor signal is equal to or greater than 512 g/s.
* This DTC runs continuously when the above conditions are met.
Conditions for Setting the DTC
P0112
The ECM detects that the IAT sensor signal is warmer than 149掳C (300掳F) for greater than 5 s.
P0113
The ECM detects that the IAT sensor signal is colder than -39掳C (-38掳F) for greater than 5 s.
Action Taken When the DTC Sets
DTCs P0112 and P0113 are Type B DTCs.
Conditions for Clearing the MIL/DTC
DTCs P0112 and P0113 are Type B DTCs.
Diagnostic Aids
* With the ignition ON, the engine OFF, if the engine is cold, a properly functioning IAT sensor will gradually increase the scan tool IAT
Sensor parameter. This is due to the heat that is generated by the mass air flow (MAF) sensor heating elements.
* Depending on the ambient temperature, an IAT sensor signal circuit or low reference circuit that is shorted to the MAF sensor signal circuit
can cause a DTC P0113 to set. This condition causes a rapid fluctuation in the IAT Sensor parameter.
* An IAT sensor signal circuit that is shorted to the MAF sensor ignition circuit can cause a DTC P0113 to set.
Reference Information
Schematic Reference
Engine Controls Schematics (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
Circuit/System Description
The intake air temperature (IAT) sensor, a part of the mass air flow (MAF) sensor assembly, is a variable resistor. The IAT sensor has a signal
circuit and a low reference circuit. The IAT sensor measures the temperature of the air entering the engine. The engine control module (ECM)
supplies 5 V to the IAT signal circuit, and a ground for the IAT low reference circuit.
Conditions for Running the DTC
P0112
* DTCs P0116, P0117, P0118, P0125, P0128, P0722, P0723 are not set.
* The engine is running for greater than 10 s.
* The engine coolant temperature (ECT) is colder than 150掳C (302掳F).
* This DTC runs continuously when the above conditions are met.
P0113
* DTCs P0101, P0102, P0103, P0116, P0117, P0118, P0125, P0128, P0722, P0723 are not set.
* The engine is running for greater than 10 s.
* The ECT is warmer than -40掳C (-40掳F).
* The MAF Sensor signal is equal to or greater than 512 g/s.
* This DTC runs continuously when the above conditions are met.
Conditions for Setting the DTC
P0112
The ECM detects that the IAT sensor signal is warmer than 149掳C (300掳F) for greater than 5 s.
P0113
The ECM detects that the IAT sensor signal is colder than -39掳C (-38掳F) for greater than 5 s.
Action Taken When the DTC Sets
DTCs P0112 and P0113 are Type B DTCs.
Conditions for Clearing the MIL/DTC
DTCs P0112 and P0113 are Type B DTCs.
Diagnostic Aids
* With the ignition ON, the engine OFF, if the engine is cold, a properly functioning IAT sensor will gradually increase the scan tool IAT
Sensor parameter. This is due to the heat that is generated by the mass air flow (MAF) sensor heating elements.
* Depending on the ambient temperature, an IAT sensor signal circuit or low reference circuit that is shorted to the MAF sensor signal circuit
can cause a DTC P0113 to set. This condition causes a rapid fluctuation in the IAT Sensor parameter.
* An IAT sensor signal circuit that is shorted to the MAF sensor ignition circuit can cause a DTC P0113 to set.
Reference Information
Schematic Reference
Engine Controls Schematics (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1760
2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1760
1. Ignition OFF, disconnect the harness connector at the MAF/IAT sensor.
2. Ignition OFF, all vehicles systems OFF, this may take up to for 2 min, test for less than 5 ohm between the IAT low reference circuit terminal
A and ground.
瀚慖f greater than the specified range, test the IAT low reference circuit for an open/high resistance. If the circuit tests normal, replace the
ECM.
3. Ignition ON, verify the scan tool IAT parameter is colder than -39掳C (-38掳F).
瀚慖f warmer than the specified range, test the IAT signal circuit terminal B for a short to ground. If the circuit tests normal, replace the
ECM.
4. Install a 3 A fused jumper wire between the IAT signal circuit terminal B and ground. Verify the scan tool IAT parameter is warmer than 149
掳C (300掳F).
瀚慖f colder than the specified range, test the IAT signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal,
replace the ECM.
5. If all circuits test normal, test or replace the MAF/IAT sensor.
Component Testing
Measure and record the resistance of the IAT sensor at various ambient temperatures, and then compare those measurements to the Temperature
Versus Resistance (See: Powertrain Management/Computers and Control Systems/Specifications/Temperature Versus Resistance) table.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Mass Airflow Sensor with Intake Air Temperature Sensor Replacement (See: Powertrain Management/Computers and Control Systems/Air
Flow Meter/Sensor/Service and Repair)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, programming, and setup
P0113
DTC P0112 or P0113
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC P0112
- Intake Air Temperature (IAT) Sensor Circuit Low Voltage
DTC P0113
- Intake Air Temperature (IAT) Sensor Circuit High Voltage
Diagnostic Fault Information
Typical Scan Tool Data
1. Ignition OFF, disconnect the harness connector at the MAF/IAT sensor.
2. Ignition OFF, all vehicles systems OFF, this may take up to for 2 min, test for less than 5 ohm between the IAT low reference circuit terminal
A and ground.
瀚慖f greater than the specified range, test the IAT low reference circuit for an open/high resistance. If the circuit tests normal, replace the
ECM.
3. Ignition ON, verify the scan tool IAT parameter is colder than -39掳C (-38掳F).
瀚慖f warmer than the specified range, test the IAT signal circuit terminal B for a short to ground. If the circuit tests normal, replace the
ECM.
4. Install a 3 A fused jumper wire between the IAT signal circuit terminal B and ground. Verify the scan tool IAT parameter is warmer than 149
掳C (300掳F).
瀚慖f colder than the specified range, test the IAT signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal,
replace the ECM.
5. If all circuits test normal, test or replace the MAF/IAT sensor.
Component Testing
Measure and record the resistance of the IAT sensor at various ambient temperatures, and then compare those measurements to the Temperature
Versus Resistance (See: Powertrain Management/Computers and Control Systems/Specifications/Temperature Versus Resistance) table.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Mass Airflow Sensor with Intake Air Temperature Sensor Replacement (See: Powertrain Management/Computers and Control Systems/Air
Flow Meter/Sensor/Service and Repair)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, programming, and setup
P0113
DTC P0112 or P0113
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC P0112
- Intake Air Temperature (IAT) Sensor Circuit Low Voltage
DTC P0113
- Intake Air Temperature (IAT) Sensor Circuit High Voltage
Diagnostic Fault Information
Typical Scan Tool Data
2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1759
2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1759
* This DTC runs continuously when the above conditions are met.
P0113
* DTCs P0101, P0102, P0103, P0116, P0117, P0118, P0125, P0128, P0722, P0723 are not set.
* The engine is running for greater than 10 s.
* The ECT is warmer than -40掳C (-40掳F).
* The MAF Sensor signal is equal to or greater than 512 g/s.
* This DTC runs continuously when the above conditions are met.
Conditions for Setting the DTC
P0112
The ECM detects that the IAT sensor signal is warmer than 149掳C (300掳F) for greater than 5 s.
P0113
The ECM detects that the IAT sensor signal is colder than -39掳C (-38掳F) for greater than 5 s.
Action Taken When the DTC Sets
DTCs P0112 and P0113 are Type B DTCs.
Conditions for Clearing the MIL/DTC
DTCs P0112 and P0113 are Type B DTCs.
Diagnostic Aids
* With the ignition ON, the engine OFF, if the engine is cold, a properly functioning IAT sensor will gradually increase the scan tool IAT
Sensor parameter. This is due to the heat that is generated by the mass air flow (MAF) sensor heating elements.
* Depending on the ambient temperature, an IAT sensor signal circuit or low reference circuit that is shorted to the MAF sensor signal circuit
can cause a DTC P0113 to set. This condition causes a rapid fluctuation in the IAT Sensor parameter.
* An IAT sensor signal circuit that is shorted to the MAF sensor ignition circuit can cause a DTC P0113 to set.
Reference Information
Schematic Reference
Engine Controls Schematics (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code
(DTC) Type Definitions)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Verification
1. Engine idling, observe the scan tool IAT Sensor parameter. The reading should be between -38 to +149掳C (-36 to +300F) depending on the
current ambient temperature and the vehicle operating conditions.
2. Operate the vehicle within the Conditions for Running the DTC to verify that the DTC does not reset. You may also operate the vehicle
within the conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
* This DTC runs continuously when the above conditions are met.
P0113
* DTCs P0101, P0102, P0103, P0116, P0117, P0118, P0125, P0128, P0722, P0723 are not set.
* The engine is running for greater than 10 s.
* The ECT is warmer than -40掳C (-40掳F).
* The MAF Sensor signal is equal to or greater than 512 g/s.
* This DTC runs continuously when the above conditions are met.
Conditions for Setting the DTC
P0112
The ECM detects that the IAT sensor signal is warmer than 149掳C (300掳F) for greater than 5 s.
P0113
The ECM detects that the IAT sensor signal is colder than -39掳C (-38掳F) for greater than 5 s.
Action Taken When the DTC Sets
DTCs P0112 and P0113 are Type B DTCs.
Conditions for Clearing the MIL/DTC
DTCs P0112 and P0113 are Type B DTCs.
Diagnostic Aids
* With the ignition ON, the engine OFF, if the engine is cold, a properly functioning IAT sensor will gradually increase the scan tool IAT
Sensor parameter. This is due to the heat that is generated by the mass air flow (MAF) sensor heating elements.
* Depending on the ambient temperature, an IAT sensor signal circuit or low reference circuit that is shorted to the MAF sensor signal circuit
can cause a DTC P0113 to set. This condition causes a rapid fluctuation in the IAT Sensor parameter.
* An IAT sensor signal circuit that is shorted to the MAF sensor ignition circuit can cause a DTC P0113 to set.
Reference Information
Schematic Reference
Engine Controls Schematics (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code
(DTC) Type Definitions)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Verification
1. Engine idling, observe the scan tool IAT Sensor parameter. The reading should be between -38 to +149掳C (-36 to +300F) depending on the
current ambient temperature and the vehicle operating conditions.
2. Operate the vehicle within the Conditions for Running the DTC to verify that the DTC does not reset. You may also operate the vehicle
within the conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1758
2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1758
3. Install a jumper wire between the low reference circuit of the MAP sensor and ground.
4. Install a jumper wire at the MAP sensor signal circuit.
5. Connect a DMM between the jumper wire from the MAP sensor signal circuit and ground.
6. Install the J-35555 to the MAP sensor vacuum port. Slowly apply vacuum to the sensor while observing the voltage on the DMM. The
voltage should vary between 0-5.2 volts without any spikes or dropouts.
瀚慖f the voltage is not within the specified range or is erratic, replace the MAP sensor.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Manifold Absolute Pressure Sensor Replacement (See: Powertrain Management/Computers and Control Systems/Manifold
Pressure/Vacuum Sensor/Service and Repair)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, setup, and programming
P0112
DTC P0112 or P0113
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC P0112
- Intake Air Temperature (IAT) Sensor Circuit Low Voltage
DTC P0113
- Intake Air Temperature (IAT) Sensor Circuit High Voltage
Diagnostic Fault Information
Typical Scan Tool Data
Circuit/System Description
The intake air temperature (IAT) sensor, a part of the mass air flow (MAF) sensor assembly, is a variable resistor. The IAT sensor has a signal
circuit and a low reference circuit. The IAT sensor measures the temperature of the air entering the engine. The engine control module (ECM)
supplies 5 V to the IAT signal circuit, and a ground for the IAT low reference circuit.
Conditions for Running the DTC
P0112
* DTCs P0116, P0117, P0118, P0125, P0128, P0722, P0723 are not set.
* The engine is running for greater than 10 s.
* The engine coolant temperature (ECT) is colder than 150掳C (302掳F).
3. Install a jumper wire between the low reference circuit of the MAP sensor and ground.
4. Install a jumper wire at the MAP sensor signal circuit.
5. Connect a DMM between the jumper wire from the MAP sensor signal circuit and ground.
6. Install the J-35555 to the MAP sensor vacuum port. Slowly apply vacuum to the sensor while observing the voltage on the DMM. The
voltage should vary between 0-5.2 volts without any spikes or dropouts.
瀚慖f the voltage is not within the specified range or is erratic, replace the MAP sensor.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Manifold Absolute Pressure Sensor Replacement (See: Powertrain Management/Computers and Control Systems/Manifold
Pressure/Vacuum Sensor/Service and Repair)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, setup, and programming
P0112
DTC P0112 or P0113
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC P0112
- Intake Air Temperature (IAT) Sensor Circuit Low Voltage
DTC P0113
- Intake Air Temperature (IAT) Sensor Circuit High Voltage
Diagnostic Fault Information
Typical Scan Tool Data
Circuit/System Description
The intake air temperature (IAT) sensor, a part of the mass air flow (MAF) sensor assembly, is a variable resistor. The IAT sensor has a signal
circuit and a low reference circuit. The IAT sensor measures the temperature of the air entering the engine. The engine control module (ECM)
supplies 5 V to the IAT signal circuit, and a ground for the IAT low reference circuit.
Conditions for Running the DTC
P0112
* DTCs P0116, P0117, P0118, P0125, P0128, P0722, P0723 are not set.
* The engine is running for greater than 10 s.
* The engine coolant temperature (ECT) is colder than 150掳C (302掳F).
2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1757
2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1757
Schematic Reference
Engine Controls Schematics (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code
(DTC) Type Definitions)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Special Tools
* J-35555 Metal Mityvac
* J-23738-A Mityvac
Circuit/System Verification
* Use the scan tool and compare the MAP Sensor parameter to a known good vehicle, under various operating conditions.
* Use the scan tool and compare the MAP Sensor parameter at ignition ON, with the engine OFF, to the Altitude vs Barometric Pressure table.
Refer to Altitude Versus Barometric Pressure (See: Powertrain Management/Computers and Control Systems/Specifications/Altitude
Versus Barometric Pressure).
Circuit/System Testing
Important: All electrical components and accessories must be turned OFF and allowed to power down.
1. Ignition OFF, disconnect the MAP harness connector at the MAP sensor.
2. Ignition OFF, test for less than 5 ohms between the low reference circuit and ground.
瀚慖f greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit and ground.
瀚慖f less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal,
replace the ECM.
瀚慖f greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.
4. Verify the scan tool MAP Sensor parameter is less than 12 kPa.
瀚慖f greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
5. Install a 3A fused jumper wire between the signal circuit and the 5-volt reference circuit. Verify the scan tool MAP Sensor parameter is
greater than 103 kPa.
瀚慖f less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace
the ECM.
6. If all circuits test normal, test or replace the MAP sensor.
Component Testing
Important: You must perform the Circuit/System Testing in order to verify the integrity of the MAP sensor circuits before proceeding
with the Component Testing.
1. Turn ON the ignition, with the engine OFF, and remove the MAP sensor.
2. Install a 3A fused jumper wire between the 5-volt reference circuit and the corresponding terminal of the MAP sensor.
Schematic Reference
Engine Controls Schematics (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code
(DTC) Type Definitions)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Special Tools
* J-35555 Metal Mityvac
* J-23738-A Mityvac
Circuit/System Verification
* Use the scan tool and compare the MAP Sensor parameter to a known good vehicle, under various operating conditions.
* Use the scan tool and compare the MAP Sensor parameter at ignition ON, with the engine OFF, to the Altitude vs Barometric Pressure table.
Refer to Altitude Versus Barometric Pressure (See: Powertrain Management/Computers and Control Systems/Specifications/Altitude
Versus Barometric Pressure).
Circuit/System Testing
Important: All electrical components and accessories must be turned OFF and allowed to power down.
1. Ignition OFF, disconnect the MAP harness connector at the MAP sensor.
2. Ignition OFF, test for less than 5 ohms between the low reference circuit and ground.
瀚慖f greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit and ground.
瀚慖f less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal,
replace the ECM.
瀚慖f greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.
4. Verify the scan tool MAP Sensor parameter is less than 12 kPa.
瀚慖f greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
5. Install a 3A fused jumper wire between the signal circuit and the 5-volt reference circuit. Verify the scan tool MAP Sensor parameter is
greater than 103 kPa.
瀚慖f less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace
the ECM.
6. If all circuits test normal, test or replace the MAP sensor.
Component Testing
Important: You must perform the Circuit/System Testing in order to verify the integrity of the MAP sensor circuits before proceeding
with the Component Testing.
1. Turn ON the ignition, with the engine OFF, and remove the MAP sensor.
2. Install a 3A fused jumper wire between the 5-volt reference circuit and the corresponding terminal of the MAP sensor.
2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1756
2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1756
Circuit Description
The manifold absolute pressure (MAP) sensor measures the pressure inside the intake manifold. Pressure in the intake manifold is affected by
engine speed, throttle opening, air temperature, and barometric pressure (BARO). A diaphragm within the MAP sensor is displaced by the pressure
changes that occur from the varying load and operating conditions of the engine. The sensor translates this action into electrical resistance. The
MAP sensor wiring includes 3 circuits. The engine control module (ECM) supplies a regulated 5 volts to the sensor on a 5-volt reference circuit.
The ECM supplies a ground on a low reference circuit. The MAP sensor provides a signal voltage to the ECM, relative to the pressure changes, on
the MAP sensor signal circuit. The ECM converts the signal voltage input to a pressure value.
Under normal operation the highest pressure that can exist in the intake manifold is equal to BARO. This occurs when the vehicle is operated at
wide-open throttle (WOT) or when the ignition is ON while the engine is OFF. Under these conditions, the ECM uses the MAP sensor to determine
the current BARO. The lowest manifold pressures occur when the vehicle is idling or decelerating. MAP can range from 10 kPa, when pressures
are low, to as much as 104 kPa when pressures are high, depending on the BARO. The ECM monitors the MAP sensor signal for pressure outside
of the normal range.
Conditions for Running the DTC
P0107
* DTCs P0641, P0651, P1516, P2101, P2125, P2135, P2138, P2176 are not set.
* The engine speed is greater than 400 RPM.
* The throttle angle is greater than 0 percent when the engine speed is less than 800 RPM.
OR
* The throttle angle is greater than 13 percent when the engine speed is greater than 800 RPM.
* This DTC runs continuously when the above conditions are met.
P0108
* DTCs P1516, P2101, P2125, P2135, P2138, P2176 are not set.
* The engine has been running for a period of time that is determined by the start-up engine coolant temperature (ECT). The time ranges from
8 seconds at less than -30掳C (-22掳F) to 3 seconds at greater than 30掳C (86掳F).
* The throttle angle is less than 1 percent when the engine speed is less than 1,200 RPM.
OR
* The throttle angle is less than 20 percent when the engine speed is greater than 1,200 RPM.
* This DTC runs continuously when the above conditions are met.
Conditions for Setting the DTC
P0107
The ECM detects that the MAP sensor voltage is less than 0.1 volt for more than 4 seconds.
P0108
The ECM detects that the MAP sensor voltage is more than 4.9 volts for greater than 4 seconds.
Action Taken When the DTC Sets
DTCs P0107 and P0108 are Type B DTCs.
Conditions for Clearing the MIL/DTC
DTCs P0107 and P0108 are Type B DTCs.
Diagnostic Aids
Verify the integrity of the MAP sensor system by inspecting for the following conditions:
* Intake manifold vacuum leaks
* Any damage to the MAP sensor housing
* Any damage to the MAP sensor seal
* A loose or improperly installed MAP sensor
* A restriction in the vacuum source of the MAP sensor
Circuit Description
The manifold absolute pressure (MAP) sensor measures the pressure inside the intake manifold. Pressure in the intake manifold is affected by
engine speed, throttle opening, air temperature, and barometric pressure (BARO). A diaphragm within the MAP sensor is displaced by the pressure
changes that occur from the varying load and operating conditions of the engine. The sensor translates this action into electrical resistance. The
MAP sensor wiring includes 3 circuits. The engine control module (ECM) supplies a regulated 5 volts to the sensor on a 5-volt reference circuit.
The ECM supplies a ground on a low reference circuit. The MAP sensor provides a signal voltage to the ECM, relative to the pressure changes, on
the MAP sensor signal circuit. The ECM converts the signal voltage input to a pressure value.
Under normal operation the highest pressure that can exist in the intake manifold is equal to BARO. This occurs when the vehicle is operated at
wide-open throttle (WOT) or when the ignition is ON while the engine is OFF. Under these conditions, the ECM uses the MAP sensor to determine
the current BARO. The lowest manifold pressures occur when the vehicle is idling or decelerating. MAP can range from 10 kPa, when pressures
are low, to as much as 104 kPa when pressures are high, depending on the BARO. The ECM monitors the MAP sensor signal for pressure outside
of the normal range.
Conditions for Running the DTC
P0107
* DTCs P0641, P0651, P1516, P2101, P2125, P2135, P2138, P2176 are not set.
* The engine speed is greater than 400 RPM.
* The throttle angle is greater than 0 percent when the engine speed is less than 800 RPM.
OR
* The throttle angle is greater than 13 percent when the engine speed is greater than 800 RPM.
* This DTC runs continuously when the above conditions are met.
P0108
* DTCs P1516, P2101, P2125, P2135, P2138, P2176 are not set.
* The engine has been running for a period of time that is determined by the start-up engine coolant temperature (ECT). The time ranges from
8 seconds at less than -30掳C (-22掳F) to 3 seconds at greater than 30掳C (86掳F).
* The throttle angle is less than 1 percent when the engine speed is less than 1,200 RPM.
OR
* The throttle angle is less than 20 percent when the engine speed is greater than 1,200 RPM.
* This DTC runs continuously when the above conditions are met.
Conditions for Setting the DTC
P0107
The ECM detects that the MAP sensor voltage is less than 0.1 volt for more than 4 seconds.
P0108
The ECM detects that the MAP sensor voltage is more than 4.9 volts for greater than 4 seconds.
Action Taken When the DTC Sets
DTCs P0107 and P0108 are Type B DTCs.
Conditions for Clearing the MIL/DTC
DTCs P0107 and P0108 are Type B DTCs.
Diagnostic Aids
Verify the integrity of the MAP sensor system by inspecting for the following conditions:
* Intake manifold vacuum leaks
* Any damage to the MAP sensor housing
* Any damage to the MAP sensor seal
* A loose or improperly installed MAP sensor
* A restriction in the vacuum source of the MAP sensor
2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1755
2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1755
5. Install a 3A fused jumper wire between the signal circuit and the 5-volt reference circuit. Verify the scan tool MAP Sensor parameter is
greater than 103 kPa.
瀚慖f less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace
the ECM.
6. If all circuits test normal, test or replace the MAP sensor.
Component Testing
Important: You must perform the Circuit/System Testing in order to verify the integrity of the MAP sensor circuits before proceeding
with the Component Testing.
1. Turn ON the ignition, with the engine OFF, and remove the MAP sensor.
2. Install a 3A fused jumper wire between the 5-volt reference circuit and the corresponding terminal of the MAP sensor.
3. Install a jumper wire between the low reference circuit of the MAP sensor and ground.
4. Install a jumper wire at the MAP sensor signal circuit.
5. Connect a DMM between the jumper wire from the MAP sensor signal circuit and ground.
6. Install the J-35555 to the MAP sensor vacuum port. Slowly apply vacuum to the sensor while observing the voltage on the DMM. The
voltage should vary between 0-5.2 volts without any spikes or dropouts.
瀚慖f the voltage is not within the specified range or is erratic, replace the MAP sensor.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Manifold Absolute Pressure Sensor Replacement (See: Powertrain Management/Computers and Control Systems/Manifold
Pressure/Vacuum Sensor/Service and Repair)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, setup, and programming
P0108
DTC P0107 or P0108
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC P0107
- Manifold Absolute Pressure (MAP) Sensor Circuit Low Voltage
DTC P0108
- Manifold Absolute Pressure (MAP) Sensor Circuit High Voltage
Diagnostic Fault Information
Typical Scan Tool Data
5. Install a 3A fused jumper wire between the signal circuit and the 5-volt reference circuit. Verify the scan tool MAP Sensor parameter is
greater than 103 kPa.
瀚慖f less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace
the ECM.
6. If all circuits test normal, test or replace the MAP sensor.
Component Testing
Important: You must perform the Circuit/System Testing in order to verify the integrity of the MAP sensor circuits before proceeding
with the Component Testing.
1. Turn ON the ignition, with the engine OFF, and remove the MAP sensor.
2. Install a 3A fused jumper wire between the 5-volt reference circuit and the corresponding terminal of the MAP sensor.
3. Install a jumper wire between the low reference circuit of the MAP sensor and ground.
4. Install a jumper wire at the MAP sensor signal circuit.
5. Connect a DMM between the jumper wire from the MAP sensor signal circuit and ground.
6. Install the J-35555 to the MAP sensor vacuum port. Slowly apply vacuum to the sensor while observing the voltage on the DMM. The
voltage should vary between 0-5.2 volts without any spikes or dropouts.
瀚慖f the voltage is not within the specified range or is erratic, replace the MAP sensor.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Manifold Absolute Pressure Sensor Replacement (See: Powertrain Management/Computers and Control Systems/Manifold
Pressure/Vacuum Sensor/Service and Repair)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, setup, and programming
P0108
DTC P0107 or P0108
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC P0107
- Manifold Absolute Pressure (MAP) Sensor Circuit Low Voltage
DTC P0108
- Manifold Absolute Pressure (MAP) Sensor Circuit High Voltage
Diagnostic Fault Information
Typical Scan Tool Data
2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1754
2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1754
Conditions for Clearing the MIL/DTC
DTCs P0107 and P0108 are Type B DTCs.
Diagnostic Aids
Verify the integrity of the MAP sensor system by inspecting for the following conditions:
* Intake manifold vacuum leaks
* Any damage to the MAP sensor housing
* Any damage to the MAP sensor seal
* A loose or improperly installed MAP sensor
* A restriction in the vacuum source of the MAP sensor
Reference Information
Schematic Reference
Engine Controls Schematics (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code
(DTC) Type Definitions)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Special Tools
* J-35555 Metal Mityvac
* J-23738-A Mityvac
Circuit/System Verification
* Use the scan tool and compare the MAP Sensor parameter to a known good vehicle, under various operating conditions.
* Use the scan tool and compare the MAP Sensor parameter at ignition ON, with the engine OFF, to the Altitude vs Barometric Pressure table.
Refer to Altitude Versus Barometric Pressure (See: Powertrain Management/Computers and Control Systems/Specifications/Altitude
Versus Barometric Pressure).
Circuit/System Testing
Important: All electrical components and accessories must be turned OFF and allowed to power down.
1. Ignition OFF, disconnect the MAP harness connector at the MAP sensor.
2. Ignition OFF, test for less than 5 ohms between the low reference circuit and ground.
瀚慖f greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit and ground.
瀚慖f less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal,
replace the ECM.
瀚慖f greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.
4. Verify the scan tool MAP Sensor parameter is less than 12 kPa.
瀚慖f greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
Conditions for Clearing the MIL/DTC
DTCs P0107 and P0108 are Type B DTCs.
Diagnostic Aids
Verify the integrity of the MAP sensor system by inspecting for the following conditions:
* Intake manifold vacuum leaks
* Any damage to the MAP sensor housing
* Any damage to the MAP sensor seal
* A loose or improperly installed MAP sensor
* A restriction in the vacuum source of the MAP sensor
Reference Information
Schematic Reference
Engine Controls Schematics (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code
(DTC) Type Definitions)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Special Tools
* J-35555 Metal Mityvac
* J-23738-A Mityvac
Circuit/System Verification
* Use the scan tool and compare the MAP Sensor parameter to a known good vehicle, under various operating conditions.
* Use the scan tool and compare the MAP Sensor parameter at ignition ON, with the engine OFF, to the Altitude vs Barometric Pressure table.
Refer to Altitude Versus Barometric Pressure (See: Powertrain Management/Computers and Control Systems/Specifications/Altitude
Versus Barometric Pressure).
Circuit/System Testing
Important: All electrical components and accessories must be turned OFF and allowed to power down.
1. Ignition OFF, disconnect the MAP harness connector at the MAP sensor.
2. Ignition OFF, test for less than 5 ohms between the low reference circuit and ground.
瀚慖f greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit and ground.
瀚慖f less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal,
replace the ECM.
瀚慖f greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.
4. Verify the scan tool MAP Sensor parameter is less than 12 kPa.
瀚慖f greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1753
2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1753
Diagnostic Fault Information
Typical Scan Tool Data
Circuit Description
The manifold absolute pressure (MAP) sensor measures the pressure inside the intake manifold. Pressure in the intake manifold is affected by
engine speed, throttle opening, air temperature, and barometric pressure (BARO). A diaphragm within the MAP sensor is displaced by the pressure
changes that occur from the varying load and operating conditions of the engine. The sensor translates this action into electrical resistance. The
MAP sensor wiring includes 3 circuits. The engine control module (ECM) supplies a regulated 5 volts to the sensor on a 5-volt reference circuit.
The ECM supplies a ground on a low reference circuit. The MAP sensor provides a signal voltage to the ECM, relative to the pressure changes, on
the MAP sensor signal circuit. The ECM converts the signal voltage input to a pressure value.
Under normal operation the highest pressure that can exist in the intake manifold is equal to BARO. This occurs when the vehicle is operated at
wide-open throttle (WOT) or when the ignition is ON while the engine is OFF. Under these conditions, the ECM uses the MAP sensor to determine
the current BARO. The lowest manifold pressures occur when the vehicle is idling or decelerating. MAP can range from 10 kPa, when pressures
are low, to as much as 104 kPa when pressures are high, depending on the BARO. The ECM monitors the MAP sensor signal for pressure outside
of the normal range.
Conditions for Running the DTC
P0107
* DTCs P0641, P0651, P1516, P2101, P2125, P2135, P2138, P2176 are not set.
* The engine speed is greater than 400 RPM.
* The throttle angle is greater than 0 percent when the engine speed is less than 800 RPM.
OR
* The throttle angle is greater than 13 percent when the engine speed is greater than 800 RPM.
* This DTC runs continuously when the above conditions are met.
P0108
* DTCs P1516, P2101, P2125, P2135, P2138, P2176 are not set.
* The engine has been running for a period of time that is determined by the start-up engine coolant temperature (ECT). The time ranges from
8 seconds at less than -30掳C (-22掳F) to 3 seconds at greater than 30掳C (86掳F).
* The throttle angle is less than 1 percent when the engine speed is less than 1,200 RPM.
OR
* The throttle angle is less than 20 percent when the engine speed is greater than 1,200 RPM.
* This DTC runs continuously when the above conditions are met.
Conditions for Setting the DTC
P0107
The ECM detects that the MAP sensor voltage is less than 0.1 volt for more than 4 seconds.
P0108
The ECM detects that the MAP sensor voltage is more than 4.9 volts for greater than 4 seconds.
Action Taken When the DTC Sets
DTCs P0107 and P0108 are Type B DTCs.
Diagnostic Fault Information
Typical Scan Tool Data
Circuit Description
The manifold absolute pressure (MAP) sensor measures the pressure inside the intake manifold. Pressure in the intake manifold is affected by
engine speed, throttle opening, air temperature, and barometric pressure (BARO). A diaphragm within the MAP sensor is displaced by the pressure
changes that occur from the varying load and operating conditions of the engine. The sensor translates this action into electrical resistance. The
MAP sensor wiring includes 3 circuits. The engine control module (ECM) supplies a regulated 5 volts to the sensor on a 5-volt reference circuit.
The ECM supplies a ground on a low reference circuit. The MAP sensor provides a signal voltage to the ECM, relative to the pressure changes, on
the MAP sensor signal circuit. The ECM converts the signal voltage input to a pressure value.
Under normal operation the highest pressure that can exist in the intake manifold is equal to BARO. This occurs when the vehicle is operated at
wide-open throttle (WOT) or when the ignition is ON while the engine is OFF. Under these conditions, the ECM uses the MAP sensor to determine
the current BARO. The lowest manifold pressures occur when the vehicle is idling or decelerating. MAP can range from 10 kPa, when pressures
are low, to as much as 104 kPa when pressures are high, depending on the BARO. The ECM monitors the MAP sensor signal for pressure outside
of the normal range.
Conditions for Running the DTC
P0107
* DTCs P0641, P0651, P1516, P2101, P2125, P2135, P2138, P2176 are not set.
* The engine speed is greater than 400 RPM.
* The throttle angle is greater than 0 percent when the engine speed is less than 800 RPM.
OR
* The throttle angle is greater than 13 percent when the engine speed is greater than 800 RPM.
* This DTC runs continuously when the above conditions are met.
P0108
* DTCs P1516, P2101, P2125, P2135, P2138, P2176 are not set.
* The engine has been running for a period of time that is determined by the start-up engine coolant temperature (ECT). The time ranges from
8 seconds at less than -30掳C (-22掳F) to 3 seconds at greater than 30掳C (86掳F).
* The throttle angle is less than 1 percent when the engine speed is less than 1,200 RPM.
OR
* The throttle angle is less than 20 percent when the engine speed is greater than 1,200 RPM.
* This DTC runs continuously when the above conditions are met.
Conditions for Setting the DTC
P0107
The ECM detects that the MAP sensor voltage is less than 0.1 volt for more than 4 seconds.
P0108
The ECM detects that the MAP sensor voltage is more than 4.9 volts for greater than 4 seconds.
Action Taken When the DTC Sets
DTCs P0107 and P0108 are Type B DTCs.
2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1752
2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1752
瀚慖f less than the specified range, test the signal circuit terminal B for a short to ground or an open/high resistance. If the circuit tests
normal, replace the ECM.
9. If all circuits test normal, test or replace the MAP sensor.
Component Testing
Note: You must perform the Circuit/System Testing in order to verify the integrity of the MAP sensor circuits before proceeding with the
Component Testing.
Skewed Sensor Test
1. Using the following steps and referencing the table below will determine if the MAP sensor is skewed.
2. Ignition ON, engine OFF, observe the MAP sensor scan tool parameter.
3. Use the observed MAP Sensor Scan Tool parameter that is closest to a value that is indicated in the first column.
4. Using the J-23738-A or the J-35555 to apply 5 in Hg of vacuum to the MAP sensor, the parameter in the first column should decrease by 17
kPa. The acceptable range is indicated in the second column.
5. Using the J-23738-A or the J-35555 to apply 10 in Hg of vacuum to the MAP sensor, the parameter in the first column should decrease by 34
kPa. The acceptable range is indicated in the third column.
Erratic Signal Test
1. Ignition OFF, remove the MAP sensor.
2. Install a 3 A fused jumper wire between the 5 V reference circuit terminal C and the corresponding terminal of the MAP sensor.
3. Install a jumper wire between the low reference terminal A of the MAP sensor and ground.
4. Install a jumper wire at terminal B of the MAP sensor.
5. Connect a DMM between the jumper wire from the terminal B of the MAP sensor and ground.
6. Ignition ON, with the J-23738-A or J-35555, slowly apply vacuum to the sensor while observing the voltage on the DMM. The voltage
should vary between 4.9-0.2 V without any spikes or dropouts.
瀚慖f the voltage is erratic, replace the MAP sensor.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Manifold Absolute Pressure Sensor Replacement (See: Powertrain Management/Computers and Control Systems/Manifold
Pressure/Vacuum Sensor/Service and Repair)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, setup, and programming.
P0107
DTC P0107 or P0108
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC P0107
- Manifold Absolute Pressure (MAP) Sensor Circuit Low Voltage
DTC P0108
- Manifold Absolute Pressure (MAP) Sensor Circuit High Voltage
瀚慖f less than the specified range, test the signal circuit terminal B for a short to ground or an open/high resistance. If the circuit tests
normal, replace the ECM.
9. If all circuits test normal, test or replace the MAP sensor.
Component Testing
Note: You must perform the Circuit/System Testing in order to verify the integrity of the MAP sensor circuits before proceeding with the
Component Testing.
Skewed Sensor Test
1. Using the following steps and referencing the table below will determine if the MAP sensor is skewed.
2. Ignition ON, engine OFF, observe the MAP sensor scan tool parameter.
3. Use the observed MAP Sensor Scan Tool parameter that is closest to a value that is indicated in the first column.
4. Using the J-23738-A or the J-35555 to apply 5 in Hg of vacuum to the MAP sensor, the parameter in the first column should decrease by 17
kPa. The acceptable range is indicated in the second column.
5. Using the J-23738-A or the J-35555 to apply 10 in Hg of vacuum to the MAP sensor, the parameter in the first column should decrease by 34
kPa. The acceptable range is indicated in the third column.
Erratic Signal Test
1. Ignition OFF, remove the MAP sensor.
2. Install a 3 A fused jumper wire between the 5 V reference circuit terminal C and the corresponding terminal of the MAP sensor.
3. Install a jumper wire between the low reference terminal A of the MAP sensor and ground.
4. Install a jumper wire at terminal B of the MAP sensor.
5. Connect a DMM between the jumper wire from the terminal B of the MAP sensor and ground.
6. Ignition ON, with the J-23738-A or J-35555, slowly apply vacuum to the sensor while observing the voltage on the DMM. The voltage
should vary between 4.9-0.2 V without any spikes or dropouts.
瀚慖f the voltage is erratic, replace the MAP sensor.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Manifold Absolute Pressure Sensor Replacement (See: Powertrain Management/Computers and Control Systems/Manifold
Pressure/Vacuum Sensor/Service and Repair)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, setup, and programming.
P0107
DTC P0107 or P0108
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC P0107
- Manifold Absolute Pressure (MAP) Sensor Circuit Low Voltage
DTC P0108
- Manifold Absolute Pressure (MAP) Sensor Circuit High Voltage
2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1751
2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1751
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code
(DTC) Type Definitions)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Special Tools
* J-35555 Metal Mityvac
* J-23738-A Mityvac
Circuit/System Verification
1. If DTC P0641 or P0651 are set, refer to DTC P0641 or P0651 (ECM) (See: P Code Charts/P0641).
2. Verify that restrictions do not exist in the exhaust system. Refer to Restricted Exhaust (See: Engine, Cooling and Exhaust/Exhaust
System/Testing and Inspection/Restricted Exhaust).
3. Verify that the engine is in good mechanical condition. Refer to Symptoms - Engine Mechanical (See: Engine, Cooling and
Exhaust/Engine/Testing and Inspection/Symptom Related Diagnostic Procedures/Symptoms - Engine Mechanical) for the 4.8L, 5.3L, 6.0L
and 6.2L engine.
4. Ignition OFF for 90 s, determine the current vehicle testing altitude. Ignition ON, observe the scan tool BARO Sensor parameter. Compare
the parameter to the Altitude Versus Barometric Pressure (See: Powertrain Management/Computers and Control
Systems/Specifications/Altitude Versus Barometric Pressure) table. The BARO sensor pressure parameter should be within the specified
range indicated in the table.
5. A skewed MAP sensor will also cause the first and second intake manifold models to disagree with the actual MAP sensor measurements.
Use the scan tool and compare the MAP Sensor parameter to a known good vehicle under various operating conditions. The readings should
be within 3 kPa of the known good vehicle.
6. Ignition ON, observe the scan tool MAP sensor parameter. Start the engine. The MAP Sensor parameter should change.
瀚慖f the vehicle passes the Circuit System Verification Test, operate the vehicle within the Conditions for Running the DTC. You may also
operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records list.
Circuit/System Testing
Note: All electrical components and accessories must be turned OFF and allowed to power down.
1. Verify the integrity of the air induction system by inspecting for the following conditions:
* Any damaged components
* Loose or improper installation
* Improperly routed vacuum hoses
* Any vacuum leak
* Any type of restriction
* MAP sensor seal that is missing or damaged
2. Verify that restrictions do not exist in the MAP sensor vacuum source.
3. Verify that restrictions do not exist in the exhaust system. Refer to Restricted Exhaust (See: Engine, Cooling and Exhaust/Exhaust
System/Testing and Inspection/Restricted Exhaust).
4. Ignition OFF, disconnect the MAP harness connector at the MAP sensor.
5. Ignition OFF for 90 s, test for less than 5 ohm between the low reference circuit terminal A and ground.
瀚慖f greater than the specified value, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
6. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal C and ground.
瀚慖f less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal,
replace the ECM.
瀚慖f greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.
7. Verify the scan tool MAP Sensor parameter is less than 12 kPa.
瀚慖f greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
8. Install a 3 A fused jumper wire between the signal circuit terminal B and the 5 V reference circuit terminal C. Verify the scan tool MAP
Sensor parameter is greater than 103 kPa.
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code
(DTC) Type Definitions)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Special Tools
* J-35555 Metal Mityvac
* J-23738-A Mityvac
Circuit/System Verification
1. If DTC P0641 or P0651 are set, refer to DTC P0641 or P0651 (ECM) (See: P Code Charts/P0641).
2. Verify that restrictions do not exist in the exhaust system. Refer to Restricted Exhaust (See: Engine, Cooling and Exhaust/Exhaust
System/Testing and Inspection/Restricted Exhaust).
3. Verify that the engine is in good mechanical condition. Refer to Symptoms - Engine Mechanical (See: Engine, Cooling and
Exhaust/Engine/Testing and Inspection/Symptom Related Diagnostic Procedures/Symptoms - Engine Mechanical) for the 4.8L, 5.3L, 6.0L
and 6.2L engine.
4. Ignition OFF for 90 s, determine the current vehicle testing altitude. Ignition ON, observe the scan tool BARO Sensor parameter. Compare
the parameter to the Altitude Versus Barometric Pressure (See: Powertrain Management/Computers and Control
Systems/Specifications/Altitude Versus Barometric Pressure) table. The BARO sensor pressure parameter should be within the specified
range indicated in the table.
5. A skewed MAP sensor will also cause the first and second intake manifold models to disagree with the actual MAP sensor measurements.
Use the scan tool and compare the MAP Sensor parameter to a known good vehicle under various operating conditions. The readings should
be within 3 kPa of the known good vehicle.
6. Ignition ON, observe the scan tool MAP sensor parameter. Start the engine. The MAP Sensor parameter should change.
瀚慖f the vehicle passes the Circuit System Verification Test, operate the vehicle within the Conditions for Running the DTC. You may also
operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records list.
Circuit/System Testing
Note: All electrical components and accessories must be turned OFF and allowed to power down.
1. Verify the integrity of the air induction system by inspecting for the following conditions:
* Any damaged components
* Loose or improper installation
* Improperly routed vacuum hoses
* Any vacuum leak
* Any type of restriction
* MAP sensor seal that is missing or damaged
2. Verify that restrictions do not exist in the MAP sensor vacuum source.
3. Verify that restrictions do not exist in the exhaust system. Refer to Restricted Exhaust (See: Engine, Cooling and Exhaust/Exhaust
System/Testing and Inspection/Restricted Exhaust).
4. Ignition OFF, disconnect the MAP harness connector at the MAP sensor.
5. Ignition OFF for 90 s, test for less than 5 ohm between the low reference circuit terminal A and ground.
瀚慖f greater than the specified value, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
6. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal C and ground.
瀚慖f less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal,
replace the ECM.
瀚慖f greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.
7. Verify the scan tool MAP Sensor parameter is less than 12 kPa.
瀚慖f greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
8. Install a 3 A fused jumper wire between the signal circuit terminal B and the 5 V reference circuit terminal C. Verify the scan tool MAP
Sensor parameter is greater than 103 kPa.
2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1750
2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1750
Conditions for Running the DTC
* DTCs P0102, P0103, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0128, P0335, P0336 are not set.
* The engine is running.
* The IAT Sensor parameter is between -7 and +125掳C (+19 and 257掳F).
* The ECT Sensor parameter is between 70-125掳C (158-257掳F).
* This DTC runs continuously when the above conditions are met.
Conditions for Setting the DTC
The engine control module (ECM) detects that the MAP sensor pressure is not within range of the calculated pressure that is derived from the
system of models for more than 0.5 s.
Action Taken When the DTC Sets
DTC P0106 is a Type B DTC.
Conditions for Clearing the MIL/DTC
DTC P0106 is a Type B DTC.
Diagnostic Aids
Note: Verify that the engine is in good mechanical condition before continuing with this diagnostic.
* A skewed or stuck engine coolant temperature (ECT) or IAT sensor will cause the calculated models to be inaccurate and may cause this
DTC to run when it should not. Refer to Temperature Versus Resistance (See: Powertrain Management/Computers and Control
Systems/Specifications/Temperature Versus Resistance).
* The BARO that is used by the ECM to calculate the air flow models is initially based on the MAP sensor at ignition ON. When the engine is
running, the ECM will continually update the BARO value near wide open throttle using the MAP sensor and a calculation. A skewed MAP
sensor will cause the BARO value to be inaccurate. Use the scan tool and compare the BARO parameter at ignition ON to the Altitude vs.
Barometric Pressure Table. Refer to Altitude Versus Barometric Pressure (See: Powertrain Management/Computers and Control
Systems/Specifications/Altitude Versus Barometric Pressure).
* A skewed MAP sensor will also cause the first and second intake manifold models to disagree with the actual MAP sensor measurements.
Use the scan tool and compare the MAP Sensor parameter to a known good vehicle, under various operating conditions.
* Inspect for worn piston rings. Refer to Engine Compression Test (See: Engine, Cooling and Exhaust/Engine/Compression Check/Testing
and Inspection).
Reference Information
Schematic Reference
Engine Controls Schematics (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
Conditions for Running the DTC
* DTCs P0102, P0103, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0128, P0335, P0336 are not set.
* The engine is running.
* The IAT Sensor parameter is between -7 and +125掳C (+19 and 257掳F).
* The ECT Sensor parameter is between 70-125掳C (158-257掳F).
* This DTC runs continuously when the above conditions are met.
Conditions for Setting the DTC
The engine control module (ECM) detects that the MAP sensor pressure is not within range of the calculated pressure that is derived from the
system of models for more than 0.5 s.
Action Taken When the DTC Sets
DTC P0106 is a Type B DTC.
Conditions for Clearing the MIL/DTC
DTC P0106 is a Type B DTC.
Diagnostic Aids
Note: Verify that the engine is in good mechanical condition before continuing with this diagnostic.
* A skewed or stuck engine coolant temperature (ECT) or IAT sensor will cause the calculated models to be inaccurate and may cause this
DTC to run when it should not. Refer to Temperature Versus Resistance (See: Powertrain Management/Computers and Control
Systems/Specifications/Temperature Versus Resistance).
* The BARO that is used by the ECM to calculate the air flow models is initially based on the MAP sensor at ignition ON. When the engine is
running, the ECM will continually update the BARO value near wide open throttle using the MAP sensor and a calculation. A skewed MAP
sensor will cause the BARO value to be inaccurate. Use the scan tool and compare the BARO parameter at ignition ON to the Altitude vs.
Barometric Pressure Table. Refer to Altitude Versus Barometric Pressure (See: Powertrain Management/Computers and Control
Systems/Specifications/Altitude Versus Barometric Pressure).
* A skewed MAP sensor will also cause the first and second intake manifold models to disagree with the actual MAP sensor measurements.
Use the scan tool and compare the MAP Sensor parameter to a known good vehicle, under various operating conditions.
* Inspect for worn piston rings. Refer to Engine Compression Test (See: Engine, Cooling and Exhaust/Engine/Compression Check/Testing
and Inspection).
Reference Information
Schematic Reference
Engine Controls Schematics (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1749
2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1749
P0106
DTC P0106
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptor
DTC P0106
- Manifold Absolute Pressure (MAP) Sensor Performance
Diagnostic Fault Information
Typical Scan Tool Data
Circuit Description
The intake flow rationality diagnostic provides the within-range rationality check for the mass air flow (MAF), manifold absolute pressure (MAP),
and the throttle position (TP) sensors. This is an explicit model-based diagnostic containing 4 separate models for the intake system.
* The throttle model describes the flow through the throttle body and is used to estimate the MAF through the throttle body as a function of
barometric pressure (BARO), TP, intake air temperature (IAT), and estimated MAP. The information from this model is displayed on the
scan tool as the MAF Performance Test parameter.
* The first intake manifold model describes the intake manifold and is used to estimate MAP as a function of the MAF into the manifold from
the throttle body and the MAF out of the manifold caused by engine pumping. The flow into the manifold from the throttle uses the MAF
estimate calculated from the above throttle model. The information from this model is displayed on the scan tool as the MAP Performance
Test 1 parameter.
* The second intake manifold model is identical to the first intake manifold model except that the MAF sensor measurement is used instead of
the throttle model estimate for the throttle air input. The information from this model is displayed on the scan tool as the MAP Performance
Test 2 parameter.
* The fourth model is created from the combination and additional calculations of the throttle model and the first intake manifold model. The
information from this model is displayed on the scan tool as the TP Performance Test parameter.
The estimates of MAF and MAP obtained from this system of models and calculations are then compared to the actual measured values from the
MAF, MAP, and the TP sensors and to each other to determine the appropriate DTC to fail. The following table illustrates the possible failure
combinations and the resulting DTC or DTCs.
P0106
DTC P0106
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptor
DTC P0106
- Manifold Absolute Pressure (MAP) Sensor Performance
Diagnostic Fault Information
Typical Scan Tool Data
Circuit Description
The intake flow rationality diagnostic provides the within-range rationality check for the mass air flow (MAF), manifold absolute pressure (MAP),
and the throttle position (TP) sensors. This is an explicit model-based diagnostic containing 4 separate models for the intake system.
* The throttle model describes the flow through the throttle body and is used to estimate the MAF through the throttle body as a function of
barometric pressure (BARO), TP, intake air temperature (IAT), and estimated MAP. The information from this model is displayed on the
scan tool as the MAF Performance Test parameter.
* The first intake manifold model describes the intake manifold and is used to estimate MAP as a function of the MAF into the manifold from
the throttle body and the MAF out of the manifold caused by engine pumping. The flow into the manifold from the throttle uses the MAF
estimate calculated from the above throttle model. The information from this model is displayed on the scan tool as the MAP Performance
Test 1 parameter.
* The second intake manifold model is identical to the first intake manifold model except that the MAF sensor measurement is used instead of
the throttle model estimate for the throttle air input. The information from this model is displayed on the scan tool as the MAP Performance
Test 2 parameter.
* The fourth model is created from the combination and additional calculations of the throttle model and the first intake manifold model. The
information from this model is displayed on the scan tool as the TP Performance Test parameter.
The estimates of MAF and MAP obtained from this system of models and calculations are then compared to the actual measured values from the
MAF, MAP, and the TP sensors and to each other to determine the appropriate DTC to fail. The following table illustrates the possible failure
combinations and the resulting DTC or DTCs.
2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1748
2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1748
Engine Controls Schematics (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code
(DTC) Type Definitions)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Special Tools
J 38522 Variable Signal Generator
Circuit/System Verification
* Engine idling, observe the scan tool MAF Sensor parameter. The reading should be between 2,000-3,900 Hz, depending on the engine
coolant temperature (ECT).
* A wide open throttle (WOT) acceleration from a stop should cause the MAF sensor parameter on the scan tool to increase rapidly. This
increase should be from 4-9 g/s at idle to greater than 180 g/s at the time of the 1-2 shift.
* Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the
conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the MAF/IAT sensor.
2. Ignition OFF, all vehicle systems OFF, this may take up to 2 min, test for less than 5 ohm between the ground circuit terminal E and ground.
瀚慖f greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal D and ground.
瀚慖f the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
4. Ignition ON, test for 4.8-5.2 V between the MAF signal circuit terminal C and ground.
瀚慖f less than the specified range, test the MAF signal circuit for a short to ground or an open/high resistance. If the circuit tests normal,
replace the ECM.
瀚慖f greater than the specified range, test the MAF signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
5. Ignition OFF, connect the red lead of the J 38522 to the MAF signal circuit terminal C at the MAF/IAT sensor harness connector. Connect
the battery voltage supply to B+, and the black lead to ground.
6. Set the J 38522 signal to 5 V, the Frequency to 5K, and the Duty Cycle to Normal.
7. Engine idling, observe the scan tool MAF Sensor parameter. The reading should be between 4,950-5,050 Hz.
瀚慖f not within the specified range, replace the ECM.
8. If all circuits test normal, replace the MAF/IAT sensor.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Mass Airflow Sensor with Intake Air Temperature Sensor Replacement (See: Powertrain Management/Computers and Control Systems/Air
Flow Meter/Sensor/Service and Repair)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, setup and programming
Engine Controls Schematics (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code
(DTC) Type Definitions)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Special Tools
J 38522 Variable Signal Generator
Circuit/System Verification
* Engine idling, observe the scan tool MAF Sensor parameter. The reading should be between 2,000-3,900 Hz, depending on the engine
coolant temperature (ECT).
* A wide open throttle (WOT) acceleration from a stop should cause the MAF sensor parameter on the scan tool to increase rapidly. This
increase should be from 4-9 g/s at idle to greater than 180 g/s at the time of the 1-2 shift.
* Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the
conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the MAF/IAT sensor.
2. Ignition OFF, all vehicle systems OFF, this may take up to 2 min, test for less than 5 ohm between the ground circuit terminal E and ground.
瀚慖f greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal D and ground.
瀚慖f the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
4. Ignition ON, test for 4.8-5.2 V between the MAF signal circuit terminal C and ground.
瀚慖f less than the specified range, test the MAF signal circuit for a short to ground or an open/high resistance. If the circuit tests normal,
replace the ECM.
瀚慖f greater than the specified range, test the MAF signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
5. Ignition OFF, connect the red lead of the J 38522 to the MAF signal circuit terminal C at the MAF/IAT sensor harness connector. Connect
the battery voltage supply to B+, and the black lead to ground.
6. Set the J 38522 signal to 5 V, the Frequency to 5K, and the Duty Cycle to Normal.
7. Engine idling, observe the scan tool MAF Sensor parameter. The reading should be between 4,950-5,050 Hz.
瀚慖f not within the specified range, replace the ECM.
8. If all circuits test normal, replace the MAF/IAT sensor.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Mass Airflow Sensor with Intake Air Temperature Sensor Replacement (See: Powertrain Management/Computers and Control Systems/Air
Flow Meter/Sensor/Service and Repair)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, setup and programming
2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1747
2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1747
Typical Scan Tool Data
Circuit/System Description
The mass air flow (MAF) sensor is integrated with the intake air temperature (IAT) sensor. The MAF sensor is an air flow meter that measures the
amount of air entering the engine. The engine control module (ECM) uses the MAF sensor signal to provide the correct fuel delivery for all engine
speeds and loads. A small quantity of air entering the engine indicates a deceleration or idle condition. A large quantity of air entering the engine
indicates an acceleration or high load condition.
The ECM applies 5 V to the MAF sensor on the MAF sensor signal circuit. The sensor uses the voltage to produce a frequency based on the inlet
air flow through the sensor bore. The frequency varies within a range of near 2,000 Hertz at idle to near 9,700 Hertz at maximum engine load.
Conditions for Running the DTC
* The engine is running for more than 1 s.
* The engine speed is at least 300 RPM.
* The ignition signal is greater than 9 V.
* The above conditions are met for greater than 1 s.
* These DTCs run continuously when the above conditions are met.
Conditions for Setting the DTC
P0102
The ECM detects that the MAF Sensor parameter is less than 1,500 Hz or 1.2 g/s for greater than 5 s.
P0103
The ECM detects that the MAF Sensor parameter is more than 14,500 Hz or 332 g/s for greater than 5 s.
Action Taken When the DTC Sets
DTCs P0102 and P0103 are Type B DTCs.
Conditions for Clearing the MIL/DTC
DTCs P0102 and P0103 are Type B DTCs.
Diagnostic Aids
* Verify the integrity of the air induction system by inspecting for the following conditions:
- Any water intrusion in the induction system
- Any contamination or debris on the sensing elements of the MAF sensor
- Damaged components
* Verify that any electrical aftermarket devices are properly connected and grounded. Refer to Checking Aftermarket Accessories (See:
Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Checking Aftermarket
Typical Scan Tool Data
Circuit/System Description
The mass air flow (MAF) sensor is integrated with the intake air temperature (IAT) sensor. The MAF sensor is an air flow meter that measures the
amount of air entering the engine. The engine control module (ECM) uses the MAF sensor signal to provide the correct fuel delivery for all engine
speeds and loads. A small quantity of air entering the engine indicates a deceleration or idle condition. A large quantity of air entering the engine
indicates an acceleration or high load condition.
The ECM applies 5 V to the MAF sensor on the MAF sensor signal circuit. The sensor uses the voltage to produce a frequency based on the inlet
air flow through the sensor bore. The frequency varies within a range of near 2,000 Hertz at idle to near 9,700 Hertz at maximum engine load.
Conditions for Running the DTC
* The engine is running for more than 1 s.
* The engine speed is at least 300 RPM.
* The ignition signal is greater than 9 V.
* The above conditions are met for greater than 1 s.
* These DTCs run continuously when the above conditions are met.
Conditions for Setting the DTC
P0102
The ECM detects that the MAF Sensor parameter is less than 1,500 Hz or 1.2 g/s for greater than 5 s.
P0103
The ECM detects that the MAF Sensor parameter is more than 14,500 Hz or 332 g/s for greater than 5 s.
Action Taken When the DTC Sets
DTCs P0102 and P0103 are Type B DTCs.
Conditions for Clearing the MIL/DTC
DTCs P0102 and P0103 are Type B DTCs.
Diagnostic Aids
* Verify the integrity of the air induction system by inspecting for the following conditions:
- Any water intrusion in the induction system
- Any contamination or debris on the sensing elements of the MAF sensor
- Damaged components
* Verify that any electrical aftermarket devices are properly connected and grounded. Refer to Checking Aftermarket Accessories (See:
Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Checking Aftermarket
Friday, October 30, 2020
2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1746
2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1746
J 38522 Variable Signal Generator
Circuit/System Verification
* Engine idling, observe the scan tool MAF Sensor parameter. The reading should be between 2,000-3,900 Hz, depending on the engine
coolant temperature (ECT).
* A wide open throttle (WOT) acceleration from a stop should cause the MAF sensor parameter on the scan tool to increase rapidly. This
increase should be from 4-9 g/s at idle to greater than 180 g/s at the time of the 1-2 shift.
* Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the
conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the MAF/IAT sensor.
2. Ignition OFF, all vehicle systems OFF, this may take up to 2 min, test for less than 5 ohm between the ground circuit terminal E and ground.
瀚慖f greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal D and ground.
瀚慖f the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
4. Ignition ON, test for 4.8-5.2 V between the MAF signal circuit terminal C and ground.
瀚慖f less than the specified range, test the MAF signal circuit for a short to ground or an open/high resistance. If the circuit tests normal,
replace the ECM.
瀚慖f greater than the specified range, test the MAF signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
5. Ignition OFF, connect the red lead of the J 38522 to the MAF signal circuit terminal C at the MAF/IAT sensor harness connector. Connect
the battery voltage supply to B+, and the black lead to ground.
6. Set the J 38522 signal to 5 V, the Frequency to 5K, and the Duty Cycle to Normal.
7. Engine idling, observe the scan tool MAF Sensor parameter. The reading should be between 4,950-5,050 Hz.
瀚慖f not within the specified range, replace the ECM.
8. If all circuits test normal, replace the MAF/IAT sensor.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Mass Airflow Sensor with Intake Air Temperature Sensor Replacement (See: Powertrain Management/Computers and Control Systems/Air
Flow Meter/Sensor/Service and Repair)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, setup and programming
P0103
DTC P0102 or P0103
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC P0102
- Mass Air Flow (MAF) Sensor Circuit Low Frequency
DTC P0103
- Mass Air Flow (MAF) Sensor Circuit High Frequency
Diagnostic Fault Information
J 38522 Variable Signal Generator
Circuit/System Verification
* Engine idling, observe the scan tool MAF Sensor parameter. The reading should be between 2,000-3,900 Hz, depending on the engine
coolant temperature (ECT).
* A wide open throttle (WOT) acceleration from a stop should cause the MAF sensor parameter on the scan tool to increase rapidly. This
increase should be from 4-9 g/s at idle to greater than 180 g/s at the time of the 1-2 shift.
* Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the
conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the MAF/IAT sensor.
2. Ignition OFF, all vehicle systems OFF, this may take up to 2 min, test for less than 5 ohm between the ground circuit terminal E and ground.
瀚慖f greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal D and ground.
瀚慖f the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
4. Ignition ON, test for 4.8-5.2 V between the MAF signal circuit terminal C and ground.
瀚慖f less than the specified range, test the MAF signal circuit for a short to ground or an open/high resistance. If the circuit tests normal,
replace the ECM.
瀚慖f greater than the specified range, test the MAF signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
5. Ignition OFF, connect the red lead of the J 38522 to the MAF signal circuit terminal C at the MAF/IAT sensor harness connector. Connect
the battery voltage supply to B+, and the black lead to ground.
6. Set the J 38522 signal to 5 V, the Frequency to 5K, and the Duty Cycle to Normal.
7. Engine idling, observe the scan tool MAF Sensor parameter. The reading should be between 4,950-5,050 Hz.
瀚慖f not within the specified range, replace the ECM.
8. If all circuits test normal, replace the MAF/IAT sensor.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Mass Airflow Sensor with Intake Air Temperature Sensor Replacement (See: Powertrain Management/Computers and Control Systems/Air
Flow Meter/Sensor/Service and Repair)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, setup and programming
P0103
DTC P0102 or P0103
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC P0102
- Mass Air Flow (MAF) Sensor Circuit Low Frequency
DTC P0103
- Mass Air Flow (MAF) Sensor Circuit High Frequency
Diagnostic Fault Information
2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1745
2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1745
speeds and loads. A small quantity of air entering the engine indicates a deceleration or idle condition. A large quantity of air entering the engine
indicates an acceleration or high load condition.
The ECM applies 5 V to the MAF sensor on the MAF sensor signal circuit. The sensor uses the voltage to produce a frequency based on the inlet
air flow through the sensor bore. The frequency varies within a range of near 2,000 Hertz at idle to near 9,700 Hertz at maximum engine load.
Conditions for Running the DTC
* The engine is running for more than 1 s.
* The engine speed is at least 300 RPM.
* The ignition signal is greater than 9 V.
* The above conditions are met for greater than 1 s.
* These DTCs run continuously when the above conditions are met.
Conditions for Setting the DTC
P0102
The ECM detects that the MAF Sensor parameter is less than 1,500 Hz or 1.2 g/s for greater than 5 s.
P0103
The ECM detects that the MAF Sensor parameter is more than 14,500 Hz or 332 g/s for greater than 5 s.
Action Taken When the DTC Sets
DTCs P0102 and P0103 are Type B DTCs.
Conditions for Clearing the MIL/DTC
DTCs P0102 and P0103 are Type B DTCs.
Diagnostic Aids
* Verify the integrity of the air induction system by inspecting for the following conditions:
- Any water intrusion in the induction system
- Any contamination or debris on the sensing elements of the MAF sensor
- Damaged components
* Verify that any electrical aftermarket devices are properly connected and grounded. Refer to Checking Aftermarket Accessories (See:
Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Checking Aftermarket
Accessories).
Reference Information
Schematic Reference
Engine Controls Schematics (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code
(DTC) Type Definitions)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
speeds and loads. A small quantity of air entering the engine indicates a deceleration or idle condition. A large quantity of air entering the engine
indicates an acceleration or high load condition.
The ECM applies 5 V to the MAF sensor on the MAF sensor signal circuit. The sensor uses the voltage to produce a frequency based on the inlet
air flow through the sensor bore. The frequency varies within a range of near 2,000 Hertz at idle to near 9,700 Hertz at maximum engine load.
Conditions for Running the DTC
* The engine is running for more than 1 s.
* The engine speed is at least 300 RPM.
* The ignition signal is greater than 9 V.
* The above conditions are met for greater than 1 s.
* These DTCs run continuously when the above conditions are met.
Conditions for Setting the DTC
P0102
The ECM detects that the MAF Sensor parameter is less than 1,500 Hz or 1.2 g/s for greater than 5 s.
P0103
The ECM detects that the MAF Sensor parameter is more than 14,500 Hz or 332 g/s for greater than 5 s.
Action Taken When the DTC Sets
DTCs P0102 and P0103 are Type B DTCs.
Conditions for Clearing the MIL/DTC
DTCs P0102 and P0103 are Type B DTCs.
Diagnostic Aids
* Verify the integrity of the air induction system by inspecting for the following conditions:
- Any water intrusion in the induction system
- Any contamination or debris on the sensing elements of the MAF sensor
- Damaged components
* Verify that any electrical aftermarket devices are properly connected and grounded. Refer to Checking Aftermarket Accessories (See:
Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Checking Aftermarket
Accessories).
Reference Information
Schematic Reference
Engine Controls Schematics (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code
(DTC) Type Definitions)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1744
2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1744
6. Ignition ON, test for 4.8-5.2 V between the MAF signal circuit terminal C and ground.
瀚慖f less than the specified range, test the MAF signal circuit for a short to ground or an open/high resistance. If the circuit tests normal,
replace the ECM.
瀚慖f greater than the specified range, test the MAF signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
7. Ignition OFF, connect the red lead of the J 38522 to the MAF signal circuit terminal C at the MAF/IAT sensor harness connector. Connect
the battery voltage supply to B+, and the black lead to ground.
8. Set the J 38522 Signal switch to 5 V, the Frequency switch to 5K, and the Duty Cycle switch to Normal.
9. Engine idling, observe the scan tool MAF Sensor parameter. The scan tool MAF Sensor parameter should be between 4,950-5,050 Hz.
瀚慖f not within the specified range, replace the ECM.
10. If all circuits test normal, test or replace the MAF/IAT sensor.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Mass Airflow Sensor with Intake Air Temperature Sensor Replacement (See: Powertrain Management/Computers and Control Systems/Air
Flow Meter/Sensor/Service and Repair)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, setup and programming
P0102
DTC P0102 or P0103
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC P0102
- Mass Air Flow (MAF) Sensor Circuit Low Frequency
DTC P0103
- Mass Air Flow (MAF) Sensor Circuit High Frequency
Diagnostic Fault Information
Typical Scan Tool Data
Circuit/System Description
The mass air flow (MAF) sensor is integrated with the intake air temperature (IAT) sensor. The MAF sensor is an air flow meter that measures the
amount of air entering the engine. The engine control module (ECM) uses the MAF sensor signal to provide the correct fuel delivery for all engine
6. Ignition ON, test for 4.8-5.2 V between the MAF signal circuit terminal C and ground.
瀚慖f less than the specified range, test the MAF signal circuit for a short to ground or an open/high resistance. If the circuit tests normal,
replace the ECM.
瀚慖f greater than the specified range, test the MAF signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
7. Ignition OFF, connect the red lead of the J 38522 to the MAF signal circuit terminal C at the MAF/IAT sensor harness connector. Connect
the battery voltage supply to B+, and the black lead to ground.
8. Set the J 38522 Signal switch to 5 V, the Frequency switch to 5K, and the Duty Cycle switch to Normal.
9. Engine idling, observe the scan tool MAF Sensor parameter. The scan tool MAF Sensor parameter should be between 4,950-5,050 Hz.
瀚慖f not within the specified range, replace the ECM.
10. If all circuits test normal, test or replace the MAF/IAT sensor.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Mass Airflow Sensor with Intake Air Temperature Sensor Replacement (See: Powertrain Management/Computers and Control Systems/Air
Flow Meter/Sensor/Service and Repair)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, setup and programming
P0102
DTC P0102 or P0103
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC P0102
- Mass Air Flow (MAF) Sensor Circuit Low Frequency
DTC P0103
- Mass Air Flow (MAF) Sensor Circuit High Frequency
Diagnostic Fault Information
Typical Scan Tool Data
Circuit/System Description
The mass air flow (MAF) sensor is integrated with the intake air temperature (IAT) sensor. The MAF sensor is an air flow meter that measures the
amount of air entering the engine. The engine control module (ECM) uses the MAF sensor signal to provide the correct fuel delivery for all engine
2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1743
2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1743
Repairs/Wiring Repairs)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code
(DTC) Type Definitions)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Special Tools
J 38522 Variable Speed Generator
Circuit/System Verification
1. Verify that DTC P0641 or P0651 is not set.
瀚慖f any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code
Descriptions/Diagnostic Trouble Code (DTC) List - Vehicle) for DTC P0641 or P0651 for further diagnosis.
2. Verify restrictions do not exist in the exhaust system. Refer to Restricted Exhaust (See: Engine, Cooling and Exhaust/Exhaust
System/Testing and Inspection/Restricted Exhaust).
3. Engine idling, observe the scan tool MAF Sensor parameter. The reading should be between 2,000-3,900 Hz depending on the ECT.
4. A wide open throttle (WOT) acceleration from a stop should cause the MAF Sensor parameter on the scan tool to increase rapidly. This
increase should be from 4-9 g/s at idle to greater than 180 g/s at the time of the 1-2 shift.
5. Use the scan tool and compare the MAF Sensor parameter to a known good vehicle under various operating conditions.
6. Ignition ON, observe the MAP sensor pressure parameter and compare to the Altitude Versus Barometric Pressure (See: Powertrain
Management/Computers and Control Systems/Specifications/Altitude Versus Barometric Pressure) table. The MAP sensor reading should be
within the specified range.
瀚慖f the MAP sensor pressure is not within the specified range, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic
Trouble Code Descriptions/Diagnostic Trouble Code (DTC) List - Vehicle) for DTC P0106 for further diagnosis.
7. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the
conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
1. Inspect for the following conditions:
* A dirty or deteriorating air filter element
* A leaking, loose, or cracked PCV pipe or seal
* A loose or disconnected charge air cooler hose or pipe
* A restricted or collapsed air intake duct
* A misaligned or damaged air intake duct
* Any objects blocking the air inlet probe of the MAF/IAT sensor
* Any contamination or debris on the sensing elements in the probe of the MAF/IAT sensor
* A cracked or damaged MAF sensor housing
* Any water intrusion in the induction system
* Any snow or ice build-up at the air cleaner, MAF or MAP sensors in cold climates
* An intake manifold leak
* A MAP sensor seal that is leaking, missing, or damaged
* An Intake Manifold Resonator with a leaking seal, or a cracked or broken housing
瀚慖f you find any of the above conditions, repair as necessary.
2. Ignition OFF, disconnect the harness connector at the MAF/IAT sensor.
3. Ignition OFF, all vehicle systems OFF, this may take up to 2 min, test for less than 5 ohm between the ground circuit terminal E and ground.
瀚慖f greater than the specified range, test the ground circuit for an open/high resistance.
4. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 5 ohm
between the IAT sensor low reference circuit terminal A and ground.
瀚慖f greater than the specified range, test the IAT sensor low reference circuit for an open/high resistance. If the circuit tests normal, replace
the ECM.
5. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal D and ground.
瀚慖f the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
Repairs/Wiring Repairs)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code
(DTC) Type Definitions)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Special Tools
J 38522 Variable Speed Generator
Circuit/System Verification
1. Verify that DTC P0641 or P0651 is not set.
瀚慖f any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code
Descriptions/Diagnostic Trouble Code (DTC) List - Vehicle) for DTC P0641 or P0651 for further diagnosis.
2. Verify restrictions do not exist in the exhaust system. Refer to Restricted Exhaust (See: Engine, Cooling and Exhaust/Exhaust
System/Testing and Inspection/Restricted Exhaust).
3. Engine idling, observe the scan tool MAF Sensor parameter. The reading should be between 2,000-3,900 Hz depending on the ECT.
4. A wide open throttle (WOT) acceleration from a stop should cause the MAF Sensor parameter on the scan tool to increase rapidly. This
increase should be from 4-9 g/s at idle to greater than 180 g/s at the time of the 1-2 shift.
5. Use the scan tool and compare the MAF Sensor parameter to a known good vehicle under various operating conditions.
6. Ignition ON, observe the MAP sensor pressure parameter and compare to the Altitude Versus Barometric Pressure (See: Powertrain
Management/Computers and Control Systems/Specifications/Altitude Versus Barometric Pressure) table. The MAP sensor reading should be
within the specified range.
瀚慖f the MAP sensor pressure is not within the specified range, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic
Trouble Code Descriptions/Diagnostic Trouble Code (DTC) List - Vehicle) for DTC P0106 for further diagnosis.
7. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the
conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
1. Inspect for the following conditions:
* A dirty or deteriorating air filter element
* A leaking, loose, or cracked PCV pipe or seal
* A loose or disconnected charge air cooler hose or pipe
* A restricted or collapsed air intake duct
* A misaligned or damaged air intake duct
* Any objects blocking the air inlet probe of the MAF/IAT sensor
* Any contamination or debris on the sensing elements in the probe of the MAF/IAT sensor
* A cracked or damaged MAF sensor housing
* Any water intrusion in the induction system
* Any snow or ice build-up at the air cleaner, MAF or MAP sensors in cold climates
* An intake manifold leak
* A MAP sensor seal that is leaking, missing, or damaged
* An Intake Manifold Resonator with a leaking seal, or a cracked or broken housing
瀚慖f you find any of the above conditions, repair as necessary.
2. Ignition OFF, disconnect the harness connector at the MAF/IAT sensor.
3. Ignition OFF, all vehicle systems OFF, this may take up to 2 min, test for less than 5 ohm between the ground circuit terminal E and ground.
瀚慖f greater than the specified range, test the ground circuit for an open/high resistance.
4. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 5 ohm
between the IAT sensor low reference circuit terminal A and ground.
瀚慖f greater than the specified range, test the IAT sensor low reference circuit for an open/high resistance. If the circuit tests normal, replace
the ECM.
5. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal D and ground.
瀚慖f the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1742
2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1742
Conditions for Running the DTCs
* DTCs P0102, P0103, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0128, P0335, P0336 are not set.
* The engine speed is between 450-8,000 RPM.
* The IAT Sensor parameter is between -20 and +125掳C (-4 and +257掳F).
* The ECT Sensor parameter is between 70 and 125掳C (158 and 257掳F).
* This DTC runs continuously within the enabling conditions.
Conditions for Setting the DTC
The engine control module (ECM) detects that the actual measured airflow from the MAF, MAP, and TP sensors is not within range of the
calculated airflow that is derived from the system of models for more than 0.5 s.
Action Taken When the DTC Sets
DTCs P0101 and P1101 are Type B DTCs.
Conditions for Clearing the MIL/DTC
DTCs P0101 and P1101 are Type B DTCs.
Diagnostic Aids
* A steady or intermittent high resistance of 15 ohm or greater on the ignition voltage circuit will cause the MAF sensor signal to be increased
by as much as 60 g/s. To pinpoint this condition perform a voltage drop test on the circuit.
* Any type of contamination on the MAF sensor heating elements will degrade the proper operation of the sensor. Certain types of
contaminants act as a heat insulator, which will impair the response of the sensor to airflow changes. Water or snow can create the opposite
effect, and cause the signal to increase rapidly.
* Depending on the current ambient temperature, and the vehicle operating conditions, a MAF sensor signal circuit that is shorted to the IAT
signal circuit will increase or decrease the MAF sensor signal that is interpreted by the ECM. Additionally it may cause a rapid fluctuation in
the IAT Sensor parameter.
* A skewed or stuck engine coolant temperature (ECT) or IAT sensor will cause the calculated models to be inaccurate and may cause this
DTC to run when it should not. Refer to Temperature Versus Resistance (See: Powertrain Management/Computers and Control
Systems/Specifications/Temperature Versus Resistance).
Reference Information
Schematic Reference
Engine Controls Schematics (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Conditions for Running the DTCs
* DTCs P0102, P0103, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0128, P0335, P0336 are not set.
* The engine speed is between 450-8,000 RPM.
* The IAT Sensor parameter is between -20 and +125掳C (-4 and +257掳F).
* The ECT Sensor parameter is between 70 and 125掳C (158 and 257掳F).
* This DTC runs continuously within the enabling conditions.
Conditions for Setting the DTC
The engine control module (ECM) detects that the actual measured airflow from the MAF, MAP, and TP sensors is not within range of the
calculated airflow that is derived from the system of models for more than 0.5 s.
Action Taken When the DTC Sets
DTCs P0101 and P1101 are Type B DTCs.
Conditions for Clearing the MIL/DTC
DTCs P0101 and P1101 are Type B DTCs.
Diagnostic Aids
* A steady or intermittent high resistance of 15 ohm or greater on the ignition voltage circuit will cause the MAF sensor signal to be increased
by as much as 60 g/s. To pinpoint this condition perform a voltage drop test on the circuit.
* Any type of contamination on the MAF sensor heating elements will degrade the proper operation of the sensor. Certain types of
contaminants act as a heat insulator, which will impair the response of the sensor to airflow changes. Water or snow can create the opposite
effect, and cause the signal to increase rapidly.
* Depending on the current ambient temperature, and the vehicle operating conditions, a MAF sensor signal circuit that is shorted to the IAT
signal circuit will increase or decrease the MAF sensor signal that is interpreted by the ECM. Additionally it may cause a rapid fluctuation in
the IAT Sensor parameter.
* A skewed or stuck engine coolant temperature (ECT) or IAT sensor will cause the calculated models to be inaccurate and may cause this
DTC to run when it should not. Refer to Temperature Versus Resistance (See: Powertrain Management/Computers and Control
Systems/Specifications/Temperature Versus Resistance).
Reference Information
Schematic Reference
Engine Controls Schematics (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
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