Camshaft Position (CMP) Sensor

On models equipped with a distributor, CMP sensor is made up of a Hall Effect switch (sync signal generator) and a rotating pulse ring (shutter) on distributor shaft. See Fig 1 . On Distributorless Ignition System (DIS), CMP sensor reads slots in cam timing sprocket. ECM/PCM uses this information along with information from Crankshaft Position (CKP) sensor to determine if fuel injectors and ignition coils are properly sequenced for correct cylinders.

Fig 1: Cut-Away View Of Hall Effect Distributor (Typical)

Courtesy of CHRYSLER CORP.