Camshaft Position Sensor: Description and Operation

PURPOSE
The camshaft position sensor is a photo interrupter type unit which sends signals to the engine control module which are used to determine injector timing.

OPERATION
The camshaft position sensor functions to detect the top dead center position of the No. 1 cylinder and to convert those data to pulse signals that are input to the engine control module. The engine control module, based upon those signals, calculates the sequence of fuel injection.

The power for the camshaft position sensor is supplied from the Multiport Fuel Injection relay and is grounded to the vehicle body. The camshaft position sensor, by intermitting the flow (to ground) of the 5 Volt referance voltage applied from the engine control module, produces pulse signals.