HOW TO: Change the CKP (Crankshaft Position Sensor)

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2003KJ

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This information comes from the 2003 FSM (Factory Service Manual). It should be the same (or about the same) for all years, however there are no guarantees that it is the same. This information is for the 2.4L I4 and the 3.7L V6.

CRANKSHAFT POSITION
SENSOR
DESCRIPTION


2.4L
The Crankshaft Position (CKP) sensor is mounted
into the right front side of the cylinder block (Fig. 2).
It is positioned and bolted into a machined hole.

3.7L
The Crankshaft Position (CKP) sensor is mounted
into the right rear side of the cylinder block (Fig. 3).
It is positioned and bolted into a machined hole.

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OPERATION

2.4L
Engine speed and crankshaft position are provided
through the CKP (Crankshaft Position) 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 determine 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.
A tonewheel (targetwheel) is a part of the engine
crankshaft (Fig. 4). This tonewheel has sets of
notches at its outer edge. The notches cause a pulse to be generated when
they pass under the sensor. The pulses are the input
to the PCM.

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3.7L
Engine speed and crankshaft position are provided
through the CKP (Crankshaft Position) 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 determine 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.
A tonewheel (targetwheel) is bolted to the engine
crankshaft (Fig. 5). This tonewheel has sets of
notches at its outer edge (Fig. 5).
The notches cause a pulse to be generated when
they pass under the sensor. The pulses are the input
to the PCM.

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REMOVAL

2.4L
The Crankshaft Position (CKP) sensor is mounted
into the right front side of the cylinder block (Fig. 6).
It is positioned and bolted into a machined hole.
(1) Disconnect sensor electrical connector.
(2) Remove sensor bolt.
(3) Carefully twist sensor from cylinder block.
(4) Check condition of sensor o-ring (Fig. 7).

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3.7L
The Crankshaft Position (CKP) sensor is mounted
into the right rear side of the cylinder block (Fig. 8).
It is positioned and bolted into a machined hole.
(1) Raise vehicle.
(2) Disconnect sensor electrical connector.
(3) Remove sensor mounting bolt (Fig. 8).
(4) Carefully twist sensor from cylinder block.
(5) Check condition of sensor o-ring.

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INSTALLATION

2.4L

(1) Clean out machined hole in engine block.
(2) Apply a small amount of engine oil to sensor
o-ring.
(3) Install sensor into engine block with a slight
rocking action. Do not twist sensor into position as
damage to o-ring may result.

CAUTION: Before tightening sensor mounting bolt,
be sure sensor is completely flush to cylinder
block. If sensor is not flush, damage to sensor
mounting tang may result.


(4) Install mounting bolt and tighten to 28 N·m
(21 ft. lbs.) torque.
(5) Connect electrical connector to sensor.

3.7L
(1) Clean out machined hole in engine block.
(2) Apply a small amount of engine oil to sensor
o-ring.
(3) Install sensor into engine block with a slight
rocking and twisting action.

CAUTION: Before tightening sensor mounting bolt,
be sure sensor is completely flush to cylinder
block. If sensor is not flush, damage to sensor
mounting tang may result.

(4) Install mounting bolt and tighten to 28 N·m
(21 ft. lbs.) torque.
(5) Connect electrical connector to sensor.
(6) Lower vehicle.
 

Lili'sKJ

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Thanks again Tim!!

Because of this info, I was able to install the new CKP in just 20 minutes. From jacking the car up and putting it on stands, to figuring out that this job would be much easier if I take off the skid plate, and then finally to pulling the old sensor out and putting the new one in and buttoning everything up - 20 minutes + test drive.

Seems good so far!

Lili'sKJ
 

2003KJ

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You sir, are more than welcome! I'm glad I could help, and that things turned out well!
 

Dlux

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This was excellent, thanks! Literally took me 10 minutes. Didn't even have to jack up the jeep!
 

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