Camshaft Position Sensor: Description and Operation

CAMSHAFT POSITION SENSOR
The Camshaft Position Sensor (CMP) on this engine is bolted to the right-front side of the right cylinder head.

Fig.7 CMP And Tonewheel Operation - 4.7L V-8:

The CMP sensor on this contains a hall effect device called a sync signal generator to generate a fuel sync signal. This sync signal generator detects notches located on a tonewheel. The tone-wheel is located at the front of the camshaft for the right cylinder head. As the tonewheel rotates, the notches pass through the sync signal generator. The pattern of the notches (viewed counter-clockwise from front of engine) is: 1 notch, 2 notches, 3 notches, 3 notches, 2 notches 1 notch, 3 notches and 1 notch. The signal from the CMP sensor is used in conjunction with the crankshaft position sensor to differentiate between fuel injection and spark events. It is also used to synchronize the fuel injectors with their respective cylinders.