Camshaft Position Sensor: Description and Operation

CAMSHAFT POSITION SENSOR

A Camshaft Position Sensor (CMP) provides camshaft position input to the GEMS by a Hall Effect sensor located on the engine's front cover. Electronic pulses are produced as lobes on the cam chain wheel pass the sensor tip. Four pulses are produced for every two engine revolutions.





The camshaft position signal is used by the ECM to precisely time fuel injector operation. This is especially important with Sequential Multiport Fuel Injection (SMPI). The signal is also used, along with the crankshaft position sensor, as part of the engine knock control strategy.