Camshaft Position Sensor: Description and Operation

IMPORTANT: Preform a Crankshaft Position System Variation Learning Procedure any time you make a change to the crankshaft sensor to crankshaft relationship. Changing the crank sensor to crankshaft relationship will not allow the PCM to detect a misfire at all speeds and loads accurately. Resulting in possibly setting a false misfire DTC. Removing a part for inspection and then reinstalling the same part is considered a disturbance. A false DTC P0300 could set if you do not perform this procedure. Refer to Crankshaft Position System Variation Learning Procedure.

The Camshaft Position Sensor (CMP) is used to correlate crankshaft to camshaft position so that the Powertrain Control Module (PCM) can determine which cylinder is ready to be fueled by the injector. The CMP sensor is also used to determine which cylinder is misfiring when misfire is present. If the PCM receives an intermittent signal from the CMP, then the CMP Resync Counter will increment. When the PCM cannot use the information from the CMP sensor, a DTC is set and the PCM will fuel the engine using the Alternating Synchronous Double Fire (ASDF) method. This sensor has no effect on the EI system.

A malfunction in the CMP sensor circuits will cause a DTC P0341 or P0342