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Diagnostic Aids

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NOTE: A missing CMP sensor signal may cause a long crank condition. CKP signal must be available for engine to start. CMP signal is not needed to start and operate engine. PCM can determine when a cylinder is on either firing or exhaust stroke by the 24x signal.
NOTE: On 8.1L, 12-volt reference circuit for CKP and CMP sensors are shared internally in PCM.
NOTE: Remove any debris from PCM connector surfaces before servicing PCM. Inspect PCM connector gaskets when diagnosing or replacing PCM. Ensure gaskets are installed correctly. Gaskets prevent water intrusion into PCM.

For an intermittent condition, see INTERMITTENTS in TROUBLE SHOOTING - NO CODES - TRUCKS article.

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