Dodge Dakota Sport 2001 Service Manual page 1363

14 - 36 FUEL INJECTION
CRANKSHAFT POSITION SENSOR (Continued)
Fig. 25 CKP Sensor Operation—2.5L 4-Cyl. Engine
1 - CRANKSHAFT POSITION SENSOR
2 - NOTCHES
3 - FLYWHEEL
sets of double notches and three sets of single
notches (Fig. 26).
The notches cause a pulse to be generated when
they pass under the sensor. The pulses are the input
to the PCM.
The engine will not operate if the PCM does not
receive a CKP sensor input.
OPERATION - 5.2L/5.9L
Engine speed and crankshaft position are provided
through the CKP sensor. The sensor generates pulses
that are the input sent to the Powertrain Control
Module (PCM). The PCM interprets the sensor input
to determine the crankshaft position. The PCM then
uses this position, along with other inputs, to deter-
mine injector sequence and ignition 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 5.2/5.9L V-8 engines, the flywheel/drive plate
has 8 single notches, spaced every 45 degrees, at its
outer edge (Fig. 27).
The notches cause a pulse to be generated when
they pass under the sensor. The pulses are the input
to the PCM. For each engine revolution, there are 8
pulses generated on V-8 engines.
The engine will not operate if the PCM does not
receive a CKP sensor input.
Fig. 26 CKP Sensor Operation—3.9L Engine
1 - FLYWHEEL
2 - NOTCHES
3 - CRANKSHAFT POSITION SENSOR
Fig. 27 CKP Sensor Operation—5.2L/5.9L Engine
1 - CRANKSHAFT POSITION SENSOR
2 - NOTCHES
3 - FLYWHEEL
AN