conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
1. Ignition OFF, remove the intake manifold. Refer to Intake Manifold Replacement (Without AFM) (See: Engine, Cooling and
Exhaust/Engine/Intake Manifold/Service and Repair)Intake Manifold Replacement (With AFM) (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.
锟斤拷If 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
锟斤拷If 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.
锟斤拷If 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
锟斤拷If 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, disconnect the harness connector at the valve lifter oil manifold assembly.
2. Connect the harness that is labeled resistance from the displacement on demand (DOD) tester to the valve lifter oil manifold connector.
3. Connect the power leads from the DOD tester to B+ and ground. Test for 11-18 ohm on each valve lifter oil manifold solenoid.
锟斤拷If not within the specified range for each solenoid, replace the valve lifter oil manifold assembly.
4. Test for infinite resistance between each valve lifter oil manifold circuit terminal and the valve lifter oil manifold housing.
锟斤拷If less than infinite resistance, replace the valve lifter oil manifold assembly.
Dynamic Test
1. Ignition OFF, disconnect the harness connector at the valve lifter oil manifold assembly.
2. Connect the cable that is labeled power from the displacement on demand DOD tester to the connector.
3. Connect the power leads from the DOD tester to B+ and ground.
4. 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.
锟斤拷If the function does not perform as specified, replace the valve lifter oil manifold assembly.
