Camshaft position sensor. Camshaft position sensor-4.7L engine

Camshaft position sensor

DESCRIPTION

The Camshaft Position (CMP) sensor is located in the distributor.

OPERATION

The sensor contains a hall effect device called a sync signal generator to generate a fuel sync signal.

This sync signal generator detects a rotating pulse ring (shutter) on the distributor shaft. The pulse ring rotates 180 degrees through the sync signal generator.

Its signal is used in conjunction with the Crankshaft Position (CKP) sensor to differentiate between fuel injection and spark events. It is also used to synchronize the fuel injectors with their respective cylinders.

When the leading edge of the pulse ring (shutter) enters the sync signal generator, the following occurs: The interruption of magnetic field causes the voltage to switch high resulting in a sync signal of approximately 5 volts.

When the trailing edge of the pulse ring (shutter) leaves the sync signal generator, the following occurs: The change of the magnetic field causes the sync signal voltage to switch low to 0 volts.

Camshaft position sensor-4.7L engine

DESCRIPTION

The Camshaft Position Sensor (CMP) on the 4.7L V-8 engine is bolted to the front/top of the right cylinder head (Fig. 7).

Fig. 7 CMP Location-4.7L Engine

1 - RIGHT CYLINDER HEAD

2 - CAMSHAFT POSITION SENSOR

3 - MOUNTING BOLT

4 - ELEC. CONNECTOR

OPERATION

The CMP sensor 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 tonewheel is located at the front of the camshaft for the right cylinder head (Fig. 8). 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.

Fig. 8 CMP Sensor and Tonewheel-4.7L Engine

1 - NOTCHES

2 - RIGHT CYLINDER HEAD

3 - CAMSHAFT POSITION SENSOR

4 - TONEWHEEL