Diagnostic Aids
- The following conditions could also set the DTCs:
- Physical damage to the CKP sensor or the reluctor wheel
- Excessive play or looseness of the CKP sensor or the reluctor wheel
- Improper installation of the CKP sensor or the reluctor wheel
- Foreign material passing between the CKP sensor and the reluctor wheel
- Excessive air gap between the CKP sensor and the reluctor wheel
- The ECM uses the camshaft position sensors to determine engine speed and position when there is a CKP sensor condition.
- The engine will operate with a CKP sensor condition only if the ECM has stored the learned reference position of the camshafts in memory. With a crankshaft position sensor condition the engine will go into a limp home mode after a restart. The ECM then calculates engine speed from one of the camshaft position sensors.
- An intermittent condition in the camshaft position (CMP) sensor circuits can cause a CKP DTC to set. Inspect the CMP sensor, harness connections, and related wiring, if you suspect this condition.
- Test the current out-put of the signal circuit if you suspect high resistance in the circuit. The current out-put should be greater than 1 mA when measured on the 400 mA scale.