Dodge Dakota Sport 2001 Service Manual page 1364

AN
CRANKSHAFT POSITION SENSOR (Continued)
OPERATION - 4.7L
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. 28). This tonewheel has
sets of notches at its outer edge (Fig. 28).
The notches cause a pulse to be generated when
they pass under the sensor. The pulses are the input
to the PCM.
Fig. 28 CKP Sensor Operation and Tonewheel—4.7L
V–8 Engine
1 - TONEWHEEL
2 - NOTCHES
3 - CRANKSHAFT POSITION SENSOR
4 - CRANKSHAFT
REMOVAL - 2.5L
The crankshaft position sensor is mounted in the
transmission bellhousing at left/rear side of engine
block (Fig. 29).
(1) Remove air tube between throttle body and air
cleaner housing.
(2) Near rear of intake manifold, disconnect pigtail
harness (on the sensor) from main electrical harness.
Fig. 29 Crankshaft Position Sensor—2.5L 4-Cylinder
1 - ELECTRICAL CONNECTOR
2 - TRANSMISSION BELLHOUSING
3 - MOUNTING BOLTS (2)
4 - CRANKSHAFT POSITION SENSOR
5 - RUBBER GROMMET
6 - PIGTAIL HARNESS
(3) Remove 2 sensor mounting bolts.
(4) Remove sensor.
(5) Remove clip from sensor wire harness.
REMOVAL - 3.9/5.2/5.9L
The sensor is bolted to the top of the cylinder block
near the rear of right cylinder head (Fig. 30). The
sensor is accessed by removing the right front fender
liner.
(1) Remove right front tire and right front wheel-
house liner. Refer to Front Wheelhouse Liner in
Group 23, Body.
(2) Disconnect crankshaft position sensor pigtail
harness from main wiring harness.
(3) Remove two sensor (recessed hex head) mount-
ing bolts (Fig. 30).
(4) Remove sensor from engine.
FUEL INJECTION
Engine
14 - 37