P1391

Test 1 - 2:

Test 3 - 6:

Test 7 - 10:

Test 11:

SYMPTOM
P1391-INTERMITTENT LOSS OF CMP OR CKP

WHEN MONITORED
Engine running or cranking.

SET CONDITION
When the failure counter reaches 20 for 2 consecutive trips.

POSSIBLE CAUSES
- Intermittent condition
- Checking intermittent CMP signal with a lab scope
- CMP harness inspection
- Tone wheel/pulse ring inspection
- CKP wire harness inspection
- Tone wheel/pulse ring inspection
- Checking intermittent CKP signal with a lab scope
- Camshaft position sensor
- Crankshaft position sensor