P1398

Tests 1 - 2:

Tests 3 - 8:

SYMPTOM
P1398 - MISFIRE ADAPTIVE NUMERATOR AT LIMIT

WHEN MONITORED
Under closed throttle decel. with A/C OFF, engine coolant temperature above 75 °F, & more than 50 seconds after engine start. Speed at which decel. occurs must be sufficient for given gear range, eg, above 36 mph in 1st gear or above 65 mph in high gear.

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

POSSIBLE CAUSES
- Crankshaft Position Sensor connector
- Crankshaft Position Sensor not properly installed
- CKP sensor
- Flywheel damaged
- Notches in crankshaft