Circuit Description

The Camshaft Position (CMP) sensor is a sensor designed to detect changes in a magnetic field. The control module supplies CMP sensor with signal and ground circuits. Ignition voltage is supplied to CMP sensor by an independent circuit. CMP sensor produces a magnetic field whenever ignition is on. The CMP sensor is mounted near a reluctor wheel that is attached to distributor shaft. When distributor shaft rotates, or when engine is cranking or running, reluctor wheel changes the magnetic field. The CMP sensor converts each change in magnetic field into a pulse. The number of teeth on reluctor wheel determines how many pulses the CMP sensor detects per camshaft rotation. Control module uses CMP sensor signal in order to calculate correct timing for sequential fuel injection.