2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 2972
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.
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)
