P1398

Test 1:

Tests 2 - 5:

Tests 6 - 7:

SYMPTOM
P1398-MISFIRE ADAPTIVE NUMERATOR AT LIMIT

WHEN MONITORED
Under closed throttle decel and Fuel Pulse Width equal to zero for 30 seconds.

SET CONDITION
One of the CKP sensor target windows has more than 2.86% variance from the reference window.

POSSIBLE CAUSES
- Intermittent Condition
- CMP Sensor Connector/Wiring
- CKP Sensor Connector/Wiring
- Damaged tone wheel/flexplate (Crankshaft)
- Crankshaft Position Sensor
- Faulty PCM