Crankshaft Position Sensor: Description and Operation

The Crankshaft Position sensor (CKP sensor) is a variable reluctance sensor triggered by a 36-minus-1 tooth trigger wheel located on the crankshaft pulley and damper.

The signal generated from the crankshaft position sensor is called the crankshaft position signal, which provides base timing and crankshaft speed (rpm) information to the Powertrain Control Module (PCM). Base timing is set at 10 ± 2 degrees Before Top Dead Center (BTDC) and is not adjustable.

The powertrain control module will use this information with the spark advance information to determine ignition coil turn on or turn off time.