2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 2964

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 2964

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

EN-46999 Displacement On Demand Tester

For equivalent regional tools, refer to Special Tools (See: Powertrain Management/Computers and Control Systems/Tools and Equipment).

Circuit/System Verification

1. Ignition OFF, open the hood to disable the Auto-Stop function. Refer to Hybrid Modes of Operation Description ( See: Hybrid Drive

Systems/Description and Operation/Hybrid Modes of Operation).

2. Ignition ON, verify the scan tool hood position parameter displays Open.

瀚慖f the hood position does not display Open, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code

Descriptions/Diagnostic Trouble Code (DTC) List - Vehicle) for DTC P254F.

Note: The engine oil level and the oil pressure are critical to the correct operation of the Cylinder Deactivation System. Verify that the

engine has the correct oil level and the correct oil pressure before continuing with this diagnostic. Refer to Oil Pressure Diagnosis and

Testing (See: Engine, Cooling and Exhaust/Engine/Testing and Inspection/Component Tests and General Diagnostics/Oil Pressure

Diagnosis and Testing). Inspect the Valve Lifter Oil Filter for a restriction or blockage. Refer to Valve Lifter Oil Filter Replacement (See:

Engine, Cooling and Exhaust/Engine/Camshaft, Lifters and Push Rods/Lifter / Lash Adjuster/Service and Repair/Valve Lifter Oil Filter

Replacement).

3. Ignition ON, observe the scan tool DTC information. Verify that DTC P0201-P0208, P0351-P0358, P3401, P3425, P3441, or P3449 is not

set.

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

Code (DTC) List - Vehicle) for further diagnosis.

4. Engine idling at the normal operating temperature. Verify there is no abnormal engine noise.

瀚慖f there is an abnormal engine noise, refer to Symptoms - Engine Mechanical (See: Engine, Cooling and Exhaust/Engine/Testing and

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

5. Perform the Cylinder Deactivation (Active Fuel Management) System Compression Test (See: Engine, Cooling and Exhaust/Engine/Testing

and Inspection/Component Tests and General Diagnostics/Cylinder Deactivation (Active Fuel Management) System Compression Test). The

Cylinder Deactivation System should pass the compression test.

6. 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, remove the valve lifter oil manifold assembly ignition fuse from the underhood fuse block.

Note: Probe each terminal at the underhood fuse block with a test lamp connected to ground to determine what terminal to connect the

DMM. The test lamp should not illuminate on the circuit that needs to be tested.

2. Connect a DMM between the ignition circuit fuse terminal going to the valve lifter oil manifold assembly and the ECM housing.

3. Ignition ON, command each Cylinder 1, 4, 6, and 7 Deactivation solenoid ON and OFF with the scan tool. Verify the resistance of each

solenoid is between 11-18 ohm with the solenoid commanded ON.

瀚慖f greater than the specified range for all cylinder deactivation solenoids, test the ignition circuit for an open/high resistance.

瀚慖f greater than the specified range for one or more but not all cylinder deactivation solenoids, test both the control circuit and ignition

circuit for an open/high resistance or an open/high resistance in the cylinder deactivation solenoid. If the circuits and solenoid test normal

replace the ECM.

4. If all circuits and components test normal, refer to Cylinder Deactivation (Active Fuel Management) Valve Lifter Oil Manifold Diagnosis and

Testing (See: Engine, Cooling and Exhaust/Engine/Testing and Inspection/Component Tests and General Diagnostics/Cylinder Deactivation

(Active Fuel Management) Valve Lifter Oil Manifold Diagnosis and Testing) for further mechanical diagnosis of valve lifter oil manifold