K 1500 Yukon Denali AWD V8-6.0L VIN U (2002)
Crankshaft Position Sensor: Description and Operation
The Crankshaft Position (CKP) sensor is a three wire sensor based on the magneto resistive principle. A magneto resistive sensor uses two magnetic
pickups between a permanent magnet. As an element such as a reluctor wheel passes the magnets the resulting change in the magnetic field is used by the
sensor electronics to produce a digital output pulse. The PCM supplies a 12-volt, low reference, and signal circuit to the CKP sensor. The sensor returns
a digital ON/OFF pulse 24 times per crankshaft revolution. The CKP sensor reads the crankshaft mounted reluctor wheel to identify pairs of cylinders at
Top Dead Center (TDC).
