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Dodge Durango
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Ignition System » Description and operation
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 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 Fig. 8 CMP Sensor and Tonewheel-4.7L Engine

1 - NOTCHES

2 - RIGHT CYLINDER HEAD

3 - CAMSHAFT POSITION SENSOR

4 - TONEWHEEL

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