Diagnostic Aids
WARNING: This page is about a different car, the 2002 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
DTC can set due to:
- Intermittent open anywhere in CKP reference circuits. This will cause tachometer to drop out and most likely stall or disrupt engine operation.
- Intermittent short to voltage anywhere in CKP reference circuit. This will cause tachometer to drop out and may momentarily disrupt engine operation.
- Electromagnetic Interference (EMI) caused by high current carrying wiring routed near CKP sensor wiring. EMI can alter amplitude and/or frequency or CKP signal and create invalid CKP pulses.
To locate an intermittent problem, use scan tool to monitor CMP RESYNC COUNTER. If the counter starts counting up, crankshaft pulses are being interrupted, as the ECM has to resync the camshaft position.
DTC may set as a result of an intermittent open or short to ground in CKP reference circuit.