Camshaft Position Sensor: Description and Operation

CAMSHAFT POSITION (CMP) SENSOR




The camshaft position (CMP) sensor is located in the cylinder head near the number 4 fuel injector. The CMP sensor is a signal generator that is composed of a magnet and a coil with an iron core. The PCM relies on the AC signal provided by the CMP sensor in order perform the following:
- To optimize the ignition timing
- To optimize the fuel delivery
- To detect any engine misfire
- To monitor CMP actuator solenoid valve operation

OPERATION




The CMP sensor signal rotor (2) is part of the intake camshaft (1) and has 3 teeth located on the outer circumference. When the CMP sensor signal rotor (2) rotates past the CMP sensor (3), electrical signals are generated. The AC signals that are generated by the CMP sensor are sent to the PCM.