Dodge 2000 DURANGO Service Manual page 290

8D - 4 IGNITION SYSTEM
DESCRIPTION AND OPERATION (Continued)
Fig. 4 CKP Sensor Operation—5.2L/5.9L Engine
1 – CRANKSHAFT POSITION SENSOR
2 – NOTCHES
3 – FLYWHEEL
Fig. 5 CKP Sensor Location—4.7L V–8 Engine
1 – CRANKSHAFT POSITION SENSOR
2 – MOUNTING BOLT
OPERATION
Engine speed and crankshaft position are provided
through the crankshaft position sensor. The sensor
generates pulses that are the input sent to the pow-
ertrain control module (PCM). The PCM interprets
the sensor input to determine the crankshaft posi-
tion. The PCM then uses this position, along with
other inputs, to determine injector sequence and igni-
tion timing.
The sensor is a hall effect device combined with an
internal magnet. It is also sensitive to steel within a
certain distance from it.
On the 4.7L V–8 engine, a tonewheel is bolted to
the engine crankshaft (Fig. 6). This tonewheel has
sets of notches at its outer edge (Fig. 6).
The notches cause a pulse to be generated when
they pass under the sensor. The pulses are the input
to the PCM.
Fig. 6 CKP Sensor Operation and Tonewheel—4.7L
V–8 Engine
1 – TONEWHEEL
2 – NOTCHES
3 – CRANKSHAFT POSITION SENSOR
4 – CRANKSHAFT
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.
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