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 target magnet defective
- CKP sensor connector terminals OBS def
- CKP sensor defective
- CMP sensor connector terminals observable defect
- CMP sensor defective
- PCM connector terminals observable defect (camshaft)
- PCM connector terminals observable defect (crankshaft)