Camshaft Position Sensor: Description and Operation

Crankshaft Reference Sensor:

LOCATION

The camshaft reference sensor is located on the rear of left cylinder head.


FUNCTION

The signal from the camshaft reference sensor combined with the input signal from the Crankshaft Position Sensor (CPS), are what the engine controller uses to properly synchronize injection.


OPERATION

The camshaft reference sensor is used to reference firing cylinders, it sends voltage to the engine controller and works in conjunction with the Crankshaft Position Sensor (CPS) so that the engine controller can establish and maintain the correct injector firing order.

The camshaft reference sensor uses a 180° target on the end of the camshaft. The leading edge of the 180° target indicates that number 1 cylinder is nearing Top Dead Center (TDC). The trailing edge of the target indicates that the number 6 cylinder is nearing TDC.

The camshaft reference sensor generates a high/low voltage signal, as the pulse ring passes the hall effect switch. When the pulse ring passes in front of the sensor, a 5 volt signal is sent to the engine controller. When a slot is not present, the engine controller receives a 0.3 volt signal.

If engine controller does not sense input from cam reference sensor, controller will deactivate ASD and fuel pump relay, interrupting voltage to fuel pump, fuel injectors, and ignition coil, (no start condition).