Camshaft Position (CMP) Sensor

WARNING: This page is about a different car, the 2004 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Camshaft Position (CMP) Sensor

Courtesy of GENERAL MOTORS CORP.

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