Diagnostic Aids

WARNING: This page is about a different car, the 2002 Pontiac Sunfire, 2002 Pontiac Grand Am, 2002 Oldsmobile Alero, and 2002 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.

If DTC P0336 is set, diagnose that DTC first. An intermittent fault in the CKP circuit will cause the PCM to resync the cam and may set this DTC. If the PCM is resyncing the camshaft, the CMP Resync Counter on the Scan tool will increment with the engine running
An intermittent short to voltage on circuit 633 can set this DTC. A direct short to voltage on circuit 633 will set P0340, as there will be no change in the cam signal input.
Electromagnetic Interference (EMI) may also set DTC P0341. Inspect the wiring harness for damage. If the harness appears to be okay, observe the CMP resync counter on the scan tool while moving connectors and wiring harnesses related to the CMP sensor. If the CMP resync counter still does not count, while observing the scan tool, operate any non-engine related electrical components on the vehicle. A change in display will indicate the location of the malfunction.

If this DTC is determined to be intermittent, refer to INTERMITTENT CONDITIONS under SELF-DIAGNOSTIC SYSTEM.