Camshaft Position Sensor (5.7L)

The Camshaft Position (CMP) sensor is mounted through top of engine block, at the rear of valley cover. The CMP sensor works in conjunction with a 1X reluctor wheel attached at the rear of the camshaft. The CMP sensor is used to determine if a cylinder is on a firing or exhaust stroke. As camshaft rotates, a magnetic field produced by CMP sensor magnet is interrupted. This produces a signal which is sent to PCM. The PCM uses this signal in combination with Crankshaft Position (CKP) sensor 24X signal to determine crankshaft position and stroke.

Unlike the CKP sensor signal, the CMP sensor signal is not necessary to start and operate the engine. The PCM can determine the position of a particular cylinder using the CKP 24X signal.