2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 2968

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 2968

Circuit/System Testing

1. Ignition OFF, remove the intake manifold. Refer to Intake Manifold Replacement (See: Engine, Cooling and Exhaust/Engine/Intake

Manifold/Service and Repair).

2. Disconnect the harness connector at the valve lifter oil manifold assembly.

3. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal E 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. If the circuit tests normal and

the ignition circuit fuse is open, test all the components connected to the ignition circuit and replace as necessary.

4. Verify that a test lamp does not illuminate between the ignition circuit terminal E and the appropriate cylinder deactivation solenoid control

circuit terminal listed below.

* 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 the test lamp illuminates, test the control circuit for a short to ground. If the circuit tests normal, replace the ECM.

5. Remove the test lamp.

6. 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 OK.

瀚慖f not the specified value, test the appropriate control circuit listed below for a short to voltage. If the circuit tests normal, replace the

ECM.

* 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

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.