Diagnostic Aids
WARNING: This page is about a different car, the 2003 GMC Sonoma and 2003 Chevrolet S10 Pickup. However, it is still accessible from the selected car via links, so may be relevant.
- Whenever the PCM sees less than 15 resyncs in 256 seconds, the counter resets to 0. Anytime a poor connection is present, the CMP sensor active counter stops incrementing and the CMP sensor resync counter starts to increment.
- 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, then while still 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.
- A defective reluctor wheel or a cracked or damaged CMP sensor can result in an intermittent. Remove the CMP sensor and inspect for any damage. With the CMP sensor removed you can also inspect the reluctor wheel through the hole. Inspect the porosity and condition of the wheel. The edges must be square, look for a nicked or damaged wheel.
If this DTC is determined to be intermittent refer to INTERMITTENTS in TROUBLE SHOOTING - NO CODES - 2.2L SONOMA & S10 PICKUP article.