Circuit Description

WARNING: This page is about a different variant/trim than selected.

Crankshaft Position (CKP) sensor is mounted on right rear of engine block, behind starter. CKP reluctor (24X) is located on rear of crankshaft. CKP sensor will send a pulse on every falling edge of 24X reluctor wheel. A misfire will cause a change in crankshaft speed. PCM times interval between each pulse and compares each new interval with previous one to determine when an excessive change in crankshaft speed has occurred. A certain amount of acceleration/deceleration is expected between each firing stroke, but if crankshaft speed changes are more than expected amount, PCM will interpret this as a misfire. PCM continuously calculates crankshaft position from low and high resolution signals. This information is used to determine which cylinder is misfiring so that PCM can increment appropriate misfire counter. DTC will set when the following conditions are present:

Engine speed 500-4000 RPM.
Ignition voltage 5-17 volts.
PCM determines CKP sensor signal out of range for less than one second.