Component Testing
WARNING: This page is about a different car, the 2012 GMC Yukon, 2012 Chevrolet Tahoe, and 2012 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.
Static Test
- Ignition OFF, open the hood to disable the Auto-Stop function. Refer to Hybrid Modes of Operation Description .
- Ignition ON, verify the scan tool Hood Position parameter displays Open.
- If not the specified value, refer to Diagnostic Trouble Code (DTC) List - Vehicle for DTC P254F.
- Ignition OFF, disconnect the harness connector at the valve lifter oil manifold assembly.
- Connect the harness that is labeled resistance from the displacement on demand (DOD) tester to the valve lifter oil manifold connector.
- Connect the power leads from the DOD tester to B+ and ground. Test for 11-18 Ω on each valve lifter oil manifold solenoid.
- If not within the specified range for each solenoid, replace the valve lifter oil manifold assembly.
- Test for infinite resistance between each valve lifter oil manifold circuit terminal and the valve lifter oil manifold housing.
- If not the specified value, replace the valve lifter oil manifold assembly.
Dynamic Test
- Ignition OFF, open the hood to disable the Auto-Stop function. Refer to Hybrid Modes of Operation Description .
- Ignition ON, verify the scan tool Hood Position parameter displays Open.
- If not the specified value, refer to Diagnostic Trouble Code (DTC) List - Vehicle for DTC P254F.
- Ignition OFF, disconnect the harness connector at the valve lifter oil manifold assembly.
- Connect the cable that is labeled power from the displacement on demand DOD tester to the connector.
- Connect the power leads from the DOD tester to B+ and ground.
- 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.
- If the function does not perform as specified, replace the valve lifter oil manifold assembly.