Camshaft Position Sensor (3.1L & 3.4L)

A 3-wire Camshaft Position (CMP) sensor is located at top of timing cover, behind water pump. As camshaft sprocket turns, sensor magnet activates a Hall Effect switch in CMP sensor. This signal is generated whenever cylinder No. 1 is at TDC of its intake stroke.

Camshaft Position (CMP) sensor The CMP sensor signal is a digital ON/OFF pulse, output once per revolution of the camshaft. The CMP sensor does not directly affect the operation of the ignition system. The CMP sensor information is used by the PCM to determine the position of the valve train relative to the crankshaft position. By monitoring the CMP and CKP signals the PCM can accurately time the operation of the fuel injectors. The PCM supplies the sensor with a 12-volt reference, low reference, and signal circuit.