Crankshaft Position Sensor: Testing and Inspection

TESTING
A Crank Sensor that is damaged due to mispositioning or a bent interrupter ring, can result in a hesitation, sag, stumble, or dieseling condition. To determine if the Crank Sensor could be at fault, "Scan" engine rpm, while driving the vehicle. An erratic display indicates that a proper reference pulse has not been received by the ECM, which may be the result of a malfunctioning crank sensor.

INSPECTION
1. Rotate harmonic balancer, using a 28mm socket and pull handle, until the interrupter ring(s) fills the sensor slot(s) and edge of interrupter window is aligned with edge of the deflector on the pedestal.
2. Insert adjustment tool (J36179 or equivalent) into the gap between sensor and interrupter on each side of interrupter ring. if gage will not slide past sensor on either side of interrupter ring, the sensor is out of adjustment or interrupter ring is bent. This clearance should be checked at three positions around the outer interrupter ring, approximately 120° apart.

NOTE
- If found out of adjustment, the sensor should be removed and inspected for potential damage.