P1398

Tests 536 - 538:

SYMPTOM
P-1398 MIS-FIRE ADAPTIVE NUMERATOR AT LIMIT

WHEN MONITORED
Under closed throttle decel. with A/C off, engine coolant temp > 75 deg, and 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 not properly installed
- Crankshaft position connector observable defect
- Crankshaft position sensor defective
- Flywheel damaged