2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2428

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2428

Control Module References (See: Testing and Inspection/Programming and Relearning)for scan tool information

Circuit/System Testing

1. Verify that DTC P0231, P0232 or P023F are not set.

瀚慖f any of those codes are set, refer to DTC P0231, P0232, or P023F (See: P Code Charts/P0231).

2. Ensure that the entire undercarriage of the vehicle is clean, especially around the area where the K27 fuel pump control module is located.

Clear all codes from the K27 fuel pump control module and test drive the vehicle. Verify that DTC P1255 or P064A do not set.

瀚慖f DTC P1255 or P064A reset, replace the K27 fuel pump control module.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

Control Module References (See: Testing and Inspection/Programming and Relearning)for fuel pump control module replacement, setup, and

programming

P1258

DTC P1258

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 P1258

- Engine Coolant Over temperature - Protection Mode Active

Circuit/System Description

The engine control module (ECM) uses the engine coolant temperature (ECT) sensor to monitor the engine for an over-termperature condition. This

condition occurs when the coolant temperature is above a calibrated value for a calibrated length of time. The ECM will disable half of the

cylinders by turning OFF the fuel injectors. By disabling half of cylinders, the ECM is able to reduce the temperature of the coolant.

Conditions for Running the DTC

The engine is operating.

Conditions for Setting the DTC

All V8

The coolant temperature is warmer than 129掳C (264掳F) for greater than 10 seconds.

6.0L-Hybrid

The coolant temperature is warmer than 132掳C (270掳F) for greater than 10 seconds.

Action Taken When the DTC Sets

* DTC P1258 is a Type A DTC.

* The engine will operate in the Overheated Engine Protection Operating Mode.

* The engine coolant temperature indicator lamp, if equipped, will illuminate.

* The driver information center (DIC), if equipped, may display a message.

* If the protection mode is active and an ECT sensor DTC sets, the protection mode will activate during the next drive cycle until the ECT

sensor DTC runs and passes.

Conditions for Clearing the DTC

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2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1833

Control Module References (See: Testing and Inspection/Programming and Relearning)for scan tool information

Circuit/System Verification

1. Ignition ON, observe the DTC information with a scan tool. Verify no B52 HO2S heater DTCs are set.

瀚慖f a B52 HO2S heater DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code

Descriptions/Diagnostic Trouble Code (DTC) List - Vehicle).

2. Engine running, observe the appropriate scan tool B52 HO2S voltage parameter. The reading should be within the range of 50-1,050 mV.

3. 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

Note: All modules must be powered down or misdiagnosis may result.

1. Ignition OFF, disconnect the harness connector at the appropriate B52 HO2S.

2. Ignition OFF, all vehicle systems OFF, this may take up to 2 minutes, 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 ECM.

3. Ignition ON, verify the appropriate scan tool B52 HO2S parameter is approximately 450 mV.

瀚慖f less than the specified value, test the signal circuit for a short to ground. If the circuit tests normal, replace the K20 ECM.

瀚慖f greater than the specified value, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.

4. Ignition ON, install a 3 A fused jumper wire between the signal circuit terminal B and ground. Verify the appropriate scan tool B52 HO2S

parameter is less than 60 mV.

瀚慖f greater than the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the K20 ECM.

5. If all circuits test normal, replace the appropriate B52 HO2S.

Repair Instructions

Caution: Refer to Heated Oxygen Sensor Resistance Learn Reset Caution (See: Powertrain Management/Computers and Control

Systems/Oxygen Sensor/Service Precautions/Heated Oxygen Sensor Resistance Learn Reset Caution).

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Heated Oxygen Sensor Replacement - Bank 1 Sensor 1 (1500 Series) (See: Powertrain Management/Computers and Control

Systems/Oxygen Sensor/Service and Repair)Heated Oxygen Sensor Replacement - Bank 1 Sensor 1 (2500 Series) (See: Powertrain

Management/Computers and Control Systems/Oxygen Sensor/Service and Repair)

* Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 (1500 Series) (See: Powertrain Management/Computers and Control

Systems/Oxygen Sensor/Service and Repair)Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 (2500 Series) (See: Powertrain

Management/Computers and Control Systems/Oxygen Sensor/Service and Repair)

* Heated Oxygen Sensor Replacement - Bank 2 Sensor 1 (1500 Series) (See: Powertrain Management/Computers and Control

Systems/Oxygen Sensor/Service and Repair)Heated Oxygen Sensor Replacement - Bank 2 Sensor 1 (2500 Series) (See: Powertrain

Management/Computers and Control Systems/Oxygen Sensor/Service and Repair)

* Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 (1500 Series) (See: Powertrain Management/Computers and Control

Systems/Oxygen Sensor/Service and Repair)Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 (2500 Series) (See: Powertrain

Management/Computers and Control Systems/Oxygen Sensor/Service and Repair)

* Control Module References (See: Testing and Inspection/Programming and Relearning)for ECM replacement, setup, and programming

P0160

DTC P0134, P0140, P0154, or P0160

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.

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2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 753

Control Module References (See: Testing and Inspection/Programming and Relearning)for scan tool information

Circuit/System Verification

Perform the Programming and Setup procedure for the control module that set DTC B3902. Verify the DTC does not reset after programming.

If the DTC resets, replace the appropriate control module.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

Control Module References (See: Testing and Inspection/Programming and Relearning)for instrument cluster, EBCM, HVAC control module,

SDM, ECM, or steering column lock control module replacement, setup, and programming

C0000

DTC C0000

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 C0000 71

- Vehicle Speed Information Circuit Invalid Data

Circuit/System Description

The wheel speeds are detected by active wheel speed sensors. Each wheel speed sensor receives a 12 V reference voltage from the electronic brake

control module (EBCM) and provides an alternating current square wave signal to the EBCM. As the wheel spins, the EBCM uses the frequency of

the square wave signal to calculate the wheel speed. The EBCM sends the wheel speed information as a high speed controller area network (CAN)

serial data message. Modules connected to the high speed CAN circuit monitor for the vehicle speed information.

Conditions for Running the DTC

System voltage is between 9-16 V.

Conditions for Setting the DTC

A supervised periodic message that includes the wheel speed serial data has not been received.

Action Taken When the DTC Sets

The electronic suspension control is disabled for the duration of the ignition cycle.

Conditions for Clearing the DTC

A current DTC clears when the diagnostic runs and passes.

Reference Information

Schematic Reference

Electronic Suspension Control Schematics (See: Steering and Suspension/Suspension/Suspension Control ( Automatic - Electronic

)/Diagrams/Electrical Diagrams)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)

Description and Operation

Electronic Suspension Control Description and Operation (See: Steering and Suspension/Suspension/Suspension Control ( Automatic - Electronic

)/Description and Operation)

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2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 871

Control Module References (See: Testing and Inspection/Programming and Relearning)for scan tool information

Special Tools

J-46079 Tire Pressure Monitor Diagnostic Tool

Circuit/System Verification

1. Using the J-46079 , activate each tire pressure sensor and record each sensors transmission data and physical location. Verify J-46079

displays the 8-digit ID number, accurate tire pressure +/- 27.6 kPa (4 psi), Learn Mode, and at least a 1/4 graph signal strength displayed.

瀚慖f any of the parameters listed above are not displayed, replace the suspect tire pressure sensor.

2. With the scan tool, verify tire pressure sensors ID and locations displayed on the scan tool match the IDs and locations recorded from the

special tool.

瀚慖f the IDs and locations do not match, perform the Tire Pressure Indicator Sensor Learn (See: Instrument Panel, Gauges and Warning

Indicators/Tire Monitoring System/Tire Pressure Sensor/Testing and Inspection).

3. Enable the TPM learn mode. Use the J-46079 in simulate mode to learn 4 simulated sensor transmissions into the BCM. Verify that all 4

simulated sensor locations, IDs, and tire pressures displayed on the TPM special tool match the corresponding scan tool parameters

displayed.

瀚慖f the scan tool does not match, replace the K9 BCM.

4. Test drive the vehicle above 40 km/h (25 mph) for greater than 2 minutes. With the scan tool, observe the suspect Pressure Sensor Mode data

parameter. Verify the sensor mode changes to Rolling.

瀚慖f the Pressure Sensor Mode does not change, replace the suspect tire pressure sensor.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Tire Pressure Indicator Sensor Replacement (See: Instrument Panel, Gauges and Warning Indicators/Tire Monitoring System/Tire Pressure

Sensor/Service and Repair)

* Tire Pressure Indicator Sensor Learn (See: Instrument Panel, Gauges and Warning Indicators/Tire Monitoring System/Tire Pressure

Sensor/Testing and Inspection)

* Control Module References (See: Testing and Inspection/Programming and Relearning)for BCM replacement, setup and programming.

C0775

DTC C0775

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 C0775 00

- Low Tire Pressure System Sensors Malfunction

Circuit/System Description

If the tire pressure sensor learn procedure has not been performed, the tire pressure monitor indicator icon on the instrument panel cluster (IPC) will

flash for 1 minute and then remain illuminated after the ignition switch is cycled ON and the IPC bulb check is complete. If equipped, the driver

information center (DIC) will also display a service tire monitor type message. Under these circumstances, DTC C0775 will be set and the tire

pressure sensor learn procedure will need to be performed for the system to function correctly.

Conditions for Running the DTC

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2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 862

Control Module References (See: Testing and Inspection/Programming and Relearning)for scan tool information

Circuit/System Testing

1. Verify that no DTCs are present in the ECM.

瀚慖f any DTC is present, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code Descriptions/Diagnostic

Trouble Code (DTC) List - Vehicle) to diagnose that DTC prior to this diagnostic.

2. Replace the K19 suspension control module and verify the DTC does not reset.

瀚慖f the DTC resets replace the K20 engine control module (ECM).

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

Control Module References (See: Testing and Inspection/Programming and Relearning)for control module replacement, setup and programming

C0750

DTC C0750, C0755, C0760, or C0765

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 C0750 03

- Left Front Tire Pressure Sensor Low Voltage

DTC C0750 29

- Left Front Tire Pressure Sensor Too Few Pulses

DTC C0750 39

- Left Front Tire Pressure Sensor Internal Malfunction

DTC C0755 03

- Right Front Tire Pressure Sensor Low Voltage

DTC C0755 29

- Right Front Tire Pressure Sensor Too Few Pulses

DTC C0755 39

- Right Front Tire Pressure Sensor Internal Malfunction

DTC C0760 03

- Left Rear Tire Pressure Sensor Low Voltage

DTC C0760 29

- Left Rear Tire Pressure Sensor Too Few Pulses

DTC C0760 39

- Left Rear Tire Pressure Sensor Internal Malfunction

DTC C0765 03

- Right Rear Tire Pressure Sensor Low Voltage

DTC C0765 29

- Right Rear Tire Pressure Sensor Too Few Pulses

DTC C0765 39

- Right Rear Tire Pressure Sensor Internal Malfunction

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2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 620

Control Module References (See: Testing and Inspection/Programming and Relearning)for scan tool information

Circuit/System Verification

Verify none of the following DTCs are set:

* DTC B3109

* DTC B3110

* DTC B3111

* DTC B3112

* DTC B3113

If any of the DTCs are set, replace the battery in the appropriate keyless entry transmitter. Operate the transmitter 3 consecutive times. If the DTC

resets, replace the keyless entry transmitter.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

Replacing Keys (See: Accessories and Optional Equipment/Antitheft and Alarm Systems/Service and Repair/Replacing Keys)

B3113

DTC B3109-B3113

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 B3109 00

- Keyless Entry Transmitter 1 Battery

DTC B3110 00

- Keyless Entry Transmitter 2 Battery

DTC B3111 00

- Keyless Entry Transmitter 3 Battery

DTC B3112 00

- Keyless Entry Transmitter 4 Battery

DTC B3113 00

- Keyless Entry Transmitter 5 Battery

Circuit/System Description

With each press of a keyless entry transmitter button, a message containing the current battery state of the transmitter is sent to the remote control

door lock receiver, along with the commanded keyless entry function. The remote control door lock receiver sends this to the body control module

(BCM) to perform the requested function.

Conditions for Running the DTC

A keyless transmitter button is pressed.

Conditions for Setting the DTC

3 consecutive low battery signals are received from the same transmitter.

Action Taken When the DTC Sets

The keyless entry system is inoperative.

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2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 898

Control Module References (See: Testing and Inspection/Programming and Relearning)for scan tool information

Circuit/System Verification

Ignition ON, observe the scan tool EBCM Wheel Speed Sensor parameters. The reading should be the same speed on all sensors when driving in a

straight line at a speed greater than 20 km/h (13 MPH).

Circuit/System Testing

1. Ignition ON, verify that DTC C0035, C0040, C0045, or C0050 is not present in the EBCM.

瀚慖f any listed DTC is present, refer to DTC C0035, C0040, C0045, or C0050 (See: C Code Charts/C0035) to diagnose that DTC prior to

this diagnostic.

2. Replace the K17 Electronic Brake Control Module (EBCM) and verify the DTC does not reset.

瀚慖f the DTC resets, replace the module that set the DTC.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

Control Module References (See: Testing and Inspection/Programming and Relearning)for module replacement, setup and programming

C1226

DTC C1207-C1210, C1221-C1228, or C1232-C1235

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 C1207 00

- Left Front Wheel Speed Sensor Circuit High Input Malfunction

DTC C1208 00

- Right Front Wheel Speed Sensor Circuit High Input Malfunction

DTC C1209 00

- Left Rear Wheel Speed Sensor Circuit High Input Malfunction

DTC C1210 00

- Right Rear Wheel Speed Sensor Circuit High Input Malfunction

DTC C1221 00

- Left Front Wheel Speed Sensor Circuit Malfunction

DTC C1222 00

- Right Front Wheel Speed Sensor Circuit Malfunction

DTC C1223 00

- Left Rear Wheel Speed Sensor Circuit Malfunction

DTC C1224 00

- Right Rear Wheel Speed Sensor Circuit Malfunction

DTC C1225 00

- Left Front Wheel Speed Sensor Circuit Performance Malfunction

DTC C1226 00

- Right Front Wheel Speed Sensor Circuit Performance Malfunction

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2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 958

Control Module References (See: Testing and Inspection/Programming and Relearning)for scan tool information

Circuit/System Verification

1. Verify that DTCs P159F and P15A0 are not set.

瀚慖f either or both of the DTCs are set, diagnose those DTCs first.

2. Ignition ON, verify the fuel economy mode indicator lamp on the instrument panel cluster is not illuminated.

3. Ignition ON, verify the fuel economy mode indicator lamp on the instrument panel cluster illuminates when the fuel economy mode switch

button is pressed.

4. Engine running, observe the DTC information with a scan tool. DTC P15A1 should not set.

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

Note: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.

1. Ignition OFF, disconnect the harness connector at the S87 Fuel Economy Mode switch.

Note: It may take up to 2 minutes for all vehicle systems to power down.

2. Ignition OFF, and all vehicle systems OFF, test for less than 5 ohm between ground circuit terminal 2 of the harness connector and ground.

瀚慖f greater than the specified value, test the ground circuit for an open/high resistance and repair as necessary.

3. Test for 266-294 ohm between 5 V reference voltage circuit terminal 9 and signal circuit terminal 10 of the S87 fuel economy mode switch.

瀚慖f not the specified range, replace the S87 fuel economy mode switch.

4. Test for 1,414-1,562 ohm between 5 V reference voltage circuit terminal 9 and ground circuit terminal 2 of the S87 fuel economy mode

switch.

瀚慖f not the specified range, replace the S87 fuel economy mode switch.

5. With the fuel economy mode switch button depressed, test for 486-538 ohm between 5 V reference voltage circuit terminal 9 and ground

circuit terminal 2 of the S87 fuel economy mode switch.

瀚慖f not the specified range, replace the S87 fuel economy mode switch.

6. Disconnect the X2 harness connector at the ECM.

7. Test for less than 5 ohm between 5 V reference voltage circuit terminal 14 of the ECM harness connector and 5 V reference voltage circuit

terminal 9 of the fuel economy mode switch harness connector.

瀚慖f greater than the specified value, repair the 5 V reference voltage circuit as necessary.

8. Test for less than 5 ohm between signal circuit terminal 29 of the ECM harness connector and signal circuit terminal 10 of the fuel economy

mode switch harness connector.

瀚慖f greater than the specified value, repair the signal circuit as necessary.

9. If all circuits test normal, replace the K20 ECM.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

Control Module References (See: Testing and Inspection/Programming and Relearning)for ECM replacement, setup and programming

P0016

DTC P0016, P0017, P0018, or P0019 (Without LF1, LFW)

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.

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2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 956

Control Module References (See: Testing and Inspection/Programming and Relearning)for scan tool information

Circuit/System Verification

1. Ignition ON, verify the fuel economy mode indicator lamp on the instrument panel cluster is not illuminated.

2. Ignition ON, verify the fuel economy mode indicator lamp on the instrument panel cluster illuminates when the fuel economy mode switch

button is pressed.

3. Engine running, observe the scan tool DTC information. DTCs P159F and P15A0 should not set.

4. 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

Note: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.

1. Ignition OFF, disconnect the harness connector at the S87 fuel economy mode switch.

Note: It may take up to 2 minutes for all vehicle systems to power down.

2. Ignition OFF and all vehicle systems OFF, test for less than 5 ohm between ground circuit terminal 2 of the harness connector and ground.

瀚慖f greater than the specified value, test the ground circuit for an open/high resistance and repair as necessary.

3. Ignition ON, test for 4.8-5.2 V between 5 V reference circuit terminal 9 of the harness connector 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 K20 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 K20 ECM.

4. Ignition ON, test for 0.060-0.250 V between signal circuit terminal 10 of the harness connector and ground.

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 K20 ECM.

瀚慖f greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.

5. If all circuits test normal, test or replace the S87 fuel economy mode switch.

Component Testing

1. Ignition OFF, disconnect the S87 fuel economy mode switch.

2. Test for 266-294 ohm between 5 V reference voltage circuit terminal 9 and signal circuit terminal 10 of the S87 fuel economy mode switch.

瀚慖f not within the specified range, replace the S87 fuel economy mode switch.

3. Test for 1,414-1,562 ohm between 5 V reference voltage circuit terminal 9 and ground circuit terminal 2 of the S87 fuel economy mode

switch.

瀚慖f not within the specified range, replace the S87 fuel economy mode switch.

4. With the S87 fuel economy mode switch button depressed, test for 486-538 ohm between 5 V reference voltage circuit terminal 9 and ground

circuit terminal 2 of the S87 fuel economy mode switch.

瀚慖f not within the specified range, replace the S87 fuel economy mode switch.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

Control Module References (See: Testing and Inspection/Programming and Relearning)for ECM replacement, setup and programming

P15A1

DTC P15A1

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.