Camshaft Position Sensor
The Camshaft Position (CMP) sensor is triggered by a notched reluctor wheel built into the exhaust camshaft sprocket. The CMP sensor is located on top front of engine. See Fig 1 . The CMP sensor provides 6 signal pulses every camshaft revolution. Each notch or feature of the reluctor wheel is of a different size for individual cylinder identification. This means the CMP and CKP signals are pulse-width encoded to enable the PCM to constantly monitor their relationship. This relationship is used to determine camshaft actuator position and control its phasing at the correct value. The PCM also uses this signal to identify the compression stroke of each cylinder and for sequential fuel injection. The CMP sensor is connected to the PCM by a 12-volt reference, a low reference, and a signal circuit.