Camshaft Position Sensor: Description and Operation

Camshaft Position (CMP) Sensor







The camshaft position (CMP) sensor is installed on the cylinder head at the rear of the camshaft gear. The CMP sensor detects a total five through holes (four holes arranged equally every 90 deg. and one reference hole, on the camshaft gear flange surface) and sends signals to the engine control module (ECM). Receiving these signals, the ECM determines cylinder #1 compression top dead center (TDC). If the CMP sensor fails, the crankshaft position (CKP) sensor signals will substitute for the CMP sensor signals back up.