P1391 Intermittent Loss of CMP or CKP

SYMPTOM
P-1391 INTERMITTENT LOSS OF CMP OR CKP

WHEN MONITORED
During engine running.

SET CONDITION
When the expected cam signal level disagrees with the actual cam signal level.

POSSIBLE CAUSES
- CKP sensor circuit wiring harness inter def
- CMP sensor circuit wiring harness inter def
- Pulse ring or sprocket defective
- Camshaft position sensor defective
- CKP sensor connector terminals obs def
- CKP sensor defective
- CMP sensor connector terminals observable defect
- PCM connector terminals observable defect (camshaft)
- PCM connector terminals observable defect (crankshaft)