P1391

Tests 1 - 2:

Tests 3 - 9:

Tests 10 - 15:

Tests 16 - 20:

SYMPTOM
P1391 INTERMITTENT LOSS OF CMP OR CKP

WHEN MONITORED
Engine running or cranking.

SET CONDITION
When the failure counter reaches 96 for 2 consecutive trips.

POSSIBLE CAUSES
- CKP sensor connector
- CKP sensor connector terminal(s)
- CKP sensor signal circuit harness intermittent defect
- CMP and CKP wiring harness intermittent defect
- CMP sensor connector
- CMP sensor connector terminal(s)
- CMP sensor signal circuit wiring harness
- PCM black connector
- Distributor rotor or rotor drive system loose (2.5 only)
- Flywheel defective
- Camshaft position sensor
- Crankshaft position sensor
- PCM connector terminal(s) (CKP sensor)
- PCM connector terminal(s) (CMP sensor)