Dodge dakota 2002 Service Manual page 1725

14 - 28 FUEL INJECTION - GAS
CRANKSHAFT POSITION SENSOR (Continued)
Fig. 7 CKP SENSOR OPERATION AND NOTCHES -
1 - RIGHT / REAR SIDE OF CYLINDER BLOCK
2 - MACHINED HOLE
3 - NOTCHES
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 5.9L V-8 engines, the flywheel/drive plate has 8
single notches, spaced every 45 degrees, at its outer
edge (Fig. 8).
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.
8.0L V-10
The Crankshaft Position (CKP) sensor detects
notches machined into the middle of the crankshaft
(Fig. 9).
There are five sets of notches. Each set contains
two notches. Basic ignition timing is determined by
the position of the last notch in each set of notches.
Once the Powertrain Control Module (PCM) senses
the last notch, it will determine crankshaft position
(which piston will next be at Top Dead Center). An
input from the camshaft position sensor is also
needed. It may take the module up to one complete
engine revolution to determine crankshaft position
during engine cranking.
5.7L V-8
Fig. 8 CKP SENSOR OPERATION – 5.9L V-8
1 - CRANKSHAFT POSITION SENSOR
2 - NOTCHES
3 - FLYWHEEL
Fig. 9 CKP SENSOR OPERATION – 8.0L V-10
1 - CRANKSHAFT NOTCHES
2 - CRANKSHAFT
3 - CRANKSHAFT POSITION SENSOR
The PCM uses the signal from the camshaft posi-
tion sensor to determine fuel injector sequence. Once
crankshaft position has been determined, the PCM
begins energizing a ground circuit to each fuel injec-
tor to provide injector operation.
ENGINE
DR