2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1987

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1987

瀚慖f you find any of the above conditions, repair as necessary.

2. Verify that there is no misfire on cylinders 1, 4, 6, or 7 due to cylinder deactivation-Refer to Cylinder Deactivation (Active Fuel

Management) System Diagnosis (See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Component Tests

and General Diagnostics/Cylinder Deactivation (Active Fuel Management) System Diagnosis).

3. Ignition OFF, install the J 26792 - Tester to the spark plug wire boot of the misfiring cylinder.

Note: An erratic or weak spark is considered a no spark condition.

4. Attempt to start the engine and observe the J 26792 - Tester. The spark tester should spark.

瀚慖f there is no spark, test the spark plug wire for the correct resistance, refer to Ignition System Specifications (See: Powertrain

Management/Ignition System/Specifications) and Spark Plug Wire Inspection (See: Engine, Cooling and Exhaust/Engine/Tune-up and

Engine Performance Checks/Ignition Cable/Testing and Inspection).

瀚慖f the spark plug wire tests normal, refer to Electronic Ignition System Diagnosis (See: Powertrain Management/Computers and Control

Systems/Testing and Inspection/Component Tests and General Diagnostics/Electronic Ignition System Diagnosis) for diagnosis of the

ignition coil.

5. Ignition OFF, remove the spark plug from the misfiring cylinder. Verify that the following conditions do not exist with the spark plug:

* Gas, coolant, or oil fouled

* Cracked, worn, or incorrectly gapped-Refer to Spark Plug Inspection (See: Engine, Cooling and Exhaust/Engine/Tune-up and Engine

Performance Checks/Spark Plug/Testing and Inspection).

瀚慖f there is a condition with the spark plug, replace the spark plug.

6. Exchange the suspected spark plug with another cylinder that is operating correctly.

7. Operate the engine under the conditions in which the misfire occurred. This may include putting the engine under a load or allowing the

engine to return to a cold condition. Observe the Misfire Current Counters with a scan tool. The misfire should not follow the spark plug

exchange.

瀚慖f the misfire follows with the spark plug, replace the spark plug.

8. If all conditions test normal, test or inspect for the following:

* A lean or rich fuel injector-Refer to Fuel Injector Diagnosis (CH47976) (See: Powertrain Management/Fuel Delivery and Air

Induction/Fuel Injector/Testing and Inspection)Fuel Injector Diagnosis (J39021 or Scan Tool) (See: Powertrain Management/Fuel

Delivery and Air Induction/Fuel Injector/Testing and Inspection).

* An engine mechanical condition-Refer to Symptoms - Engine Mechanical (See: Engine, Cooling and Exhaust/Engine/Testing and

Inspection/Symptom Related Diagnostic Procedures/Symptoms - Engine Mechanical).

Repair Instructions

* Spark Plug Wire Replacement (See: Engine, Cooling and Exhaust/Engine/Tune-up and Engine Performance Checks/Ignition Cable/Service

and Repair)

* Spark Plug Replacement (See: Engine, Cooling and Exhaust/Engine/Tune-up and Engine Performance Checks/Spark Plug/Service and

Repair)

Repair Verification

1. Install any components that have been removed or replaced during diagnosis.

2. Clear the DTCs.

3. Turn OFF the ignition for 60 seconds.

4. If the repair was related to a DTC, duplicate the Conditions for Running the DTC and use the Freeze Frame/Failure Records, if applicable, in

order to verify the DTC does not reset. If the DTC resets or another DTC is present, refer to the Diagnostic Trouble Code (DTC) List -

Vehicle (See: Diagnostic Trouble Code Descriptions/Diagnostic Trouble Code (DTC) List - Vehicle) and perform the appropriate diagnostic

procedure.

5. To verify that the performance of the catalytic converter has not been affected by the condition that set this DTC, perform the Repair

Verification for DTCs P0420 and P0430. Refer to DTC P0420 or P0430 (See: P Code Charts/P0420).

P0305

DTC P0300-P0308

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

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 937

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 937

瀚慖f you find a condition with the timing chains or tensioners, repair as necessary.

2. Inspect the crankshaft reluctor wheel for being mis-positioned on the crankshaft.

瀚慖f you find a condition with the crankshaft, repair as necessary.

Repair Instructions

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

* Timing Chain Alignment Diagram (See: Engine, Cooling and Exhaust/Engine/Timing Components/Timing Component Alignment

Marks/Locations)

* Camshaft Timing Drive Components Cleaning and Inspection (See: Engine, Cooling and Exhaust/Engine/Service and Repair/Overhaul/81.

Camshaft Timing Drive Components Cleaning and Inspection)

* Crankshaft and Bearing Cleaning and Inspection (See: Engine, Cooling and Exhaust/Engine/Service and Repair/Overhaul/66. Crankshaft

and Bearing Cleaning and Inspection)

P0009

DTC P0008 or P0009

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 P0008

- Engine Position System Performance Bank 1

DTC P0009

- Engine Position System Performance Bank 2

Circuit/System Description

The engine control module (ECM) tests for a misalignment between both camshafts on one bank of the engine and the crankshaft. The

misalignment would be at an idler sprocket for either bank or at the crankshaft. Once the ECM learns the position of both camshafts on one bank of

the engine, the ECM compares the learned values to a reference value. The ECM will set a DTC if both learned values for one bank of the engine

are exceeding a calibrated threshold in the same direction.

Conditions for Running the DTC

* DTC P0010, P0011, P0013, P0014, P0020, P0021, P0023, P0024, P0341, P0342, P0343, P0346, P0347, P0348, P0366, P0367, P0368,

P0391, P0392, P0393, P2088, P2089, P2090, P2091, P2092, P2093, P2094, or P2095 is not set.

* The engine is operating for greater than 2 s.

* The engine must accelerate such that the CMP actuator system is commanded from the park position to the phased position. This is

considered a cam control cycle. There must be a minimum of 2 cam control cycles for at least 2.5 s each, in the phased position.

* DTC P0008 and P0009 run continuously once the above conditions are met, approximately 600 s.

Conditions for Setting the DTC

The ECM detects that both camshafts on either bank of the engine are mis-aligned with the crankshaft for greater than 1 s or for a cumulative time

of 4 s.

Action Taken When the DTC Sets

DTC P0008 and P0009 are type B DTCs.

Conditions for Clearing the DTC

DTC P0008 and P0009 are type B DTCs.