P1391

Tests 1 - 2:

Tests 3 - 6:

Tests 7 - 10:

Tests 11 - 14:

Tests 15 - 20:

Tests 21 - 26:

Test 27:

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
- CKP sensor improperly installed
- CKP sensor connector terminal(s)
- CKP sensor signal circuit wiring harness
- CMP sensor connector terminal(s)
- CMP sensor signal circuit wiring harness
- Distributor position not in range
- CKP sensor
- Crankshaft notches damaged or misaligned
- PCM connector terminal(s) (CKP sensor)
- PCM connector terminal(s) (CMP sensor)