Crankshaft Position Sensor: Description and Operation

CRANKSHAFT POSITION SENSOR

Basic engine timing is controlled by the ECM using input from the Crankshaft Position Sensor (CKP). The sensor's signal is also used by the ECM in its engine knock and cylinder misfire operating strategies. There are no back-up strategies for the Crankshaft Position Sensor The engine will not start or continue to run in the event of a Crankshaft Position Sensor failure. It is mounted on the flywheel housing, opposite the starter motor.





The sensor reacts to reluctor teeth placed on the flywheel at 10° intervals. One missing reluctor tooth identifies the T.D.C. position of the #1 piston. The electrical signal produced by the crankshaft position sensor as the teeth pass it provides a constant update of engine speed and crankshaft position to the ECM.