2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 2976

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 2976

7. Install a 3 A fused jumper wire between the appropriate control circuit terminal listed below and the ignition circuit terminal E. Command the

appropriate cylinder deactivation solenoid ON with a scan tool. Verify the scan tool Cylinder Deactivation Solenoid Valve Control Circuit

High Voltage Test Status parameter displays Malfunction.

* Cylinder deactivation solenoid valve 1 terminal C

* Cylinder deactivation solenoid valve 2 terminal A

* Cylinder deactivation solenoid valve 3 terminal B

* Cylinder deactivation solenoid valve 4 terminal D

瀚慖f not the specified value, test the control circuit for an open/high resistance. If the circuit tests normal, replace the ECM.

8. If all the circuits test normal, test or replace the valve lifter oil manifold assembly.

Component Testing

Static Test

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 not the specified value, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code

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

3. Ignition OFF, disconnect the harness connector at the valve lifter oil manifold assembly.

4. Connect the harness that is labeled resistance from the displacement on demand (DOD) tester to the valve lifter oil manifold connector.

5. Connect the power leads from the DOD tester to B+ and ground. Test for 11-18 ohm on each valve lifter oil manifold solenoid.

瀚慖f not within the specified range for each solenoid, replace the valve lifter oil manifold assembly.

6. Test for infinite resistance between each valve lifter oil manifold circuit terminal and the valve lifter oil manifold housing.

瀚慖f not the specified value, replace the valve lifter oil manifold assembly.

Dynamic Test

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 not the specified value, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code

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

3. Ignition OFF, disconnect the harness connector at the valve lifter oil manifold assembly.

4. Connect the cable that is labeled power from the displacement on demand DOD tester to the connector.

5. Connect the power leads from the DOD tester to B+ and ground.

6. Command each valve lifter oil manifold solenoid ON and OFF using the DOD tester. You should be able to hear each solenoid turn ON and

OFF.

瀚慖f the function does not perform as specified, replace the valve lifter oil manifold assembly.

Repair Instructions

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

* Valve Lifter Oil Manifold Replacement (See: Engine, Cooling and Exhaust/Engine/Camshaft, Lifters and Push Rods/Lifter / Lash

Adjuster/Service and Repair/Valve Lifter Oil Manifold Replacement)

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

P3449

DTC P3401, P3425, P3441, or P3449

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.