Crankshaft Position Sensor: Description and Operation

Crankshaft Position (CKP) Sensor:

The Crankshaft Position (CKP) Sensor works in conjunction with a 58 tooth reluctor wheel on the crankshaft. The Engine Control Module (ECM) monitors the voltage between the CKP sensor signal circuits. As each reluctor wheel tooth rotates past the sensor, the sensor creates an analog signal. This analog signal is processed by the ECM. The reluctor wheel teeth are 6 degrees apart. Having only 58 teeth leaves a 12 degree span that is uncut. This creates a signature pattern that enables the ECM to determine the crankshaft position. The ECM can determine which two cylinders are approaching the top center based on the CKP signal alone. The Camshaft Position (CMP) Sensor signal is used in order to determine which of the two cylinders is on a tiring stroke. The ECM can then properly synchronize the ignition system, the fuel injectors, and the knock control. This sensor is also used in order to detect misfire. Refer to DTC P0300 for information on misfire detection. The DTC P0335-CKP Sensor Circuit indicates that the ECM has detected a CKP system fault.