Camshaft Position (CMP) Sensor

CMP sensor is located in timing cover or engine block. CMP sensor continuously sends PCM a signal that is used as a 'sync pulse' to trigger injectors in the proper sequence. The signal indicates to PCM the position of No. 1 piston during it's power stroke. PCM is then able to calculate true sequential fuel injection operation. If signal is lost, PCM reverts back to calculated sequential mode based on the last fuel injection pulse received.