Diagnostic Aids

If a CKP DTC is also present, check shared ground circuit. If a fuel injector DTC is also present, check shared power supply circuit. Check for poor connection at PCM. Inspect harness connectors for backed-out terminals, improper mating, broken locks, improperly formed or damaged terminals and poor terminal connection. Observe a voltmeter connected to CMP sensor signal circuit at PCM harness connector while moving all related harnesses and connectors. A change in voltage indicates fault location.