P1391

Tests 1 - 3:

Tests 4 - 9:

Tests 10 - 14:

Tests 15 - 18:

SYMPTOM
P1391 - INTERMITTENT LOSS OF CMP OR CKP

WHEN MONITORED
With engine running.

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

POSSIBLE CAUSES
- Pulse ring or target magnet defective
- CMP sensor circuit wiring harness intermittent defect
- CKP sensor circuit wiring harness intermittent defect
- CMP sensor connector terminals observable defect
- CKP sensor connector terminals observable defect
- CMP sensor defective
- CKP sensor defective
- PCM connector terminals observable defect (camshaft)
- PCM connector terminals observable defect (crankshaft)