This has to do with the camshaft sensor circuit, not necessarily the sensor itself. Here is the diagnostic. Unfortunately, a scan tool is necessary to properly perform the diagnostic.
Diagnostic Procedures
1. Perform On-Board Diagnostic (OBD) system check. After performing OBD system check, go to next step.
2. Operate vehicle within FAIL RECORDS data. Using scan tool, monitor SPECIFIC DTC info for this DTC until DTC test runs. If scan tool indicates that this DTC failed this ignition, go to next step. If scan tool does not indicate that this DTC failed this ignition, see DIAGNOSTIC AIDS.
3. Start engine. Using scan tool, observe CAM signal. If scan tool indicates that CAM signal is present, see DIAGNOSTIC AIDS. If scan tool does not indicate that CAM signal is present, go to next step.
4. Turn ignition off. Disconnect CMP sensor harness connector. Turn ignition on, with engine off. Using a DVOM, check voltage between ground and CMP sensor feed circuit. If battery voltage is present, go to step 6. If battery voltage is not present, go to next step.
5. Turn ignition off. Disconnect PCM harness connector. Check CMP sensor feed circuit for short to ground or open circuit. Repair as necessary. After repairs, go to step 16. If circuit is okay, go to step 12.
6. Using a test light connected to battery voltage. Probe test light to CMP sensor ground circuit. If test light illuminates, go to step 8. If test light does not illuminate, go to next step.
7. Turn ignition off. Disconnect PCM harness connector. Check CMP sensor ground circuit for open in circuit. Repair as necessary. After repairs, go to step 16. If circuit is okay, go to step 12.
8. Start engine. Using scan tool, monitor CAM signal. Using a fused jumper wire connected to battery voltage, momentarily touch the signal circuit 5 times for about one second each time. If CAM signal changes each time the signal circuit is touched, go to step 14. If CAM signal does not change each time the signal circuit is touched, go to next step.
9. Check if fuse in jumper wire. If fuse is open, go to step 11. If fuse is okay, go to next step.
10. Check CMP sensor signal circuit for short to voltage or open circuit. Repair as necessary. After repairs, go to step 16. If circuit is okay, go to step 12.
11. Check CMP sensor signal circuit for short to ground. Repair as necessary. After repairs, go to step 16. If circuit is okay, go to next step.
12. Check for poor connections at PCM. Repair as necessary. After repairs, go to step 16. If connections are okay, go to next step.
13. Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to next step.
14. Check for poor connections at CMP sensor. Repair as necessary. After repairs, go to step 16. If connections are okay, go to next step.
15. Replace CMP sensor. After replacing sensor, go to next step.
16. Using scan tool, read and record FAILURE RECORDS data for this DTC. Operate vehicle within conditions noted in FAILURE RECORDS data. Read SPECIFIC DTC. If scan tool indicates that this DTC FAILED THIS IGN, return to step 2. If scan tool does not indicate that this DTC FAILED THIS IGN, system is okay.
Diagnostic Aid
Check for incorrect harness routing near secondary ignition components, ignition coil arcing to wiring harness or ICM. Check ignition coils for cracks, carbon tracking or other signs of damage. Check for secondary ignition wire(s) arcing to wiring harness.
Check for faulty connections or damaged harness. Observe a voltmeter connected to CMP sensor signal circuit at PCM harness connector while moving all related harness and connectors. A change in voltage indicates fault location.
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Saturday, May 23rd, 2009 AT 10:24 PM