Camshaft Position Sensor
An engine management sensor that monitors the rotational speed and precise alignment of the camshaft to synchronize fuel injection and ignition timing.
The camshaft position (CMP) sensor is a vital electronic sensor that informs the engine control module (ECM) about the position and rotational speed of the camshaft relative to the crankshaft. This information is critical for controlling sequential fuel injection and determining when to fire the spark plug or activate the ignition coil in each cylinder.
By monitoring the camshaft, the ECM can also adjust variable valve timing (VVT) parameters on the fly. CMP sensors can fail due to electrical shorts, heat cycling, or contamination from engine oil.
A faulty camshaft position sensor typically causes the check engine light to illuminate, resulting in engine misfires, poor acceleration, stalling, or a crank-no-start condition. Replacing a faulty sensor is a straightforward repair that restores engine performance.