Crankshaft Position Sensor: Description and Operation

PURPOSE
The Crankshaft Position Sensor is a Photo Interrupter type unit which sends signals to the engine control module which are used to determine ignition and injector timing.

OPERATION
The crankshaft position sensor functions to detect the crank angle (position) of each cylinder, and to convert those data to pulse signals, which are then input to the engine control module. The engine control module, based upon those signals, calculates the engine rpm, and also regulates the fuel injection timing and the ignition timing.