Jeep Wrangler TJ. Manual — part 466
ACCELERATOR PEDAL
REMOVAL
The accelerator pedal is connected to the throttle
body linkage by the throttle cable. The cable is pro-
tected by a plastic sheathing and is connected to the
throttle body linkage by a ball socket. It is connected
to the upper part of the accelerator pedal arm by a
plastic retainer (clip) (Fig. 1). This retainer (clip)
snaps into the top of the accelerator pedal arm.
Retainer tabs (built into the cable sheathing) (Fig. 1)
fasten the cable to the dash panel.
CAUTION: Be careful not to damage or kink the
cable core wire (within the cable sheathing) while
servicing the accelerator pedal or throttle cable.
(1) From inside vehicle, hold up accelerator pedal.
Remove plastic cable retainer (clip) and throttle cable
core wire from upper end of accelerator pedal arm
(Fig. 1). Plastic cable retainer (clip) snaps into pedal
arm.
(2) Remove accelerator pedal mounting bracket
nuts.
(3)
Remove accelerator pedal assembly.
INSTALLATION
(1) Place accelerator pedal assembly over mount-
ing studs protruding from floor pan. Tighten mount-
ing nuts to 8.5 N·m (75 in. lbs.) torque.
(2) Slide throttle cable into opening (slot) in top of
pedal arm. An index tab is located on pedal arm.
Rotate and push plastic cable retainer (clip) into
accelerator pedal arm opening until it snaps into
place on index tab.
(3) Before
starting
engine,
operate
accelerator
pedal to check for any binding.
CRANKSHAFT POSITION
SENSOR
DESCRIPTION
2.4L
The Crankshaft Position (CKP) sensor is mounted
into the right front side of the cylinder block. It is
positioned and bolted into a machined hole.
4.0L
The Crankshaft Position (CKP) sensor is located
near the outer edge of the flywheel (starter ringear).
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 inter-
prets the sensor input to determine the crankshaft
position. 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.
A tonewheel (targetwheel) is a part of the engine
crankshaft (Fig. 2). 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.
Fig. 1 Accelerator Pedal Mounting
1 - CABLE RETAINER
2 - SLOT
3 - MOUNTING STUDS (2)
4 - PEDAL/BRACKET ASSEMBLY
5 - MOUNTING STUDS
6 - RETAINER TABS
7 - CABLE
8 - CABLE STOP
TJ
FUEL INJECTION
14 - 23
4.0L
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.
The flywheel/drive plate has groups of four notches
at its outer edge. On 4.0L 6-cylinder engines there
are three sets of notches (Fig. 3).
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 3
groups of four pulses generated on 4.0L 6-cylinder
engines.
The trailing edge of the fourth notch, which causes
the pulse, is four degrees before top dead center
(TDC) of the corresponding piston.
The engine will not operate if the PCM does not
receive a CKP sensor input.
REMOVAL
2.4L
The Crankshaft Position (CKP) sensor is mounted
into the right front side of the cylinder block (Fig. 4).
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. 5).
Fig. 2 CKP OPERATION - 2.4L
1 - NOTCHES
2 - CRANKSHAFT
Fig. 3 CKP OPERATION - 4.0L
1 - CRANKSHAFT POSITION SENSOR
2 - FLYWHEEL
3 - FLYWHEEL NOTCHES
Fig. 4 CKP SENSOR LOCATION - 2.4L
1 - RIGHT FRONT ENGINE MOUNT
2 - CKP SENSOR
3 - MOUNTING BOLT
4 - ELECTRICAL CONNECTOR
14 - 24
FUEL INJECTION
TJ
CRANKSHAFT POSITION SENSOR (Continued)
4.0L
The crankshaft position (CKP) sensor is mounted
to the transmission bellhousing near the rear of the
engine block.
The sensor may be mounted to the transmission
with one of the following four different configura-
tions:
• with one bolt to the right side of the transmis-
sion if equipped with a 42RLE automatic transmis-
sion (Fig. 6).
• with one bolt to the left side of the transmission
(Fig. 7). If sensor is equipped with one mounting bolt,
it is adjustable..
• with two nuts to the left side of the transmission
(Fig. 8).
• with two bolts to the left side of the transmis-
sion (Fig. 9).
(1) Disconnect sensor pigtail harness (electrical
connector) from main electrical harness.
(2) Depending upon application, remove either sen-
sor mounting bolt(s) or nuts.
(3) Remove sensor from engine.
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.
Fig. 5 CKP AND O-RING - 2.4L
1 - CKP SENSOR
2 - O-RING
Fig. 6 CKP (WITH 42RLE AUTO. TRANS.)
1 - CKP SENSOR
2 - MOUNTING BOLT
3 - ELEC. CONNECTOR
4 - TRANS. BELLHOUSING
Fig. 7 CKP - ONE-BOLT MOUNTING (EXCEPT 42RLE
AUTO. TRANS.)
1 - SENSOR PIGTAIL
2 - CRANKSHAFT POSITION SENSOR
3 - MOUNTING BOLT
4 - TRANSMISSION HOUSING
5 - PAPER SPACER
6 - SLOTTED HOLE
TJ
FUEL INJECTION
14 - 25
CRANKSHAFT POSITION SENSOR (Continued)
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.
4.0L
Sensor With 1–Bolt Mounting (Equipped With
42 RLE Automatic Transmission):
(1) Install sensor flush against opening in trans-
mission housing.
(2) Install and tighten sensor mounting bolt to 12
N·m (9 ft. lbs.) torque.
(3) Connect electrical connector to sensor.
Sensor With 2–Bolt Mounting:
(4) Install sensor flush against opening in trans-
mission housing.
(5)
Install and tighten two sensor mounting bolts
to 12 N·m (9 ft. lbs.) torque. The two sensor mount-
ing bolts are specially machined to correctly space
unit to flywheel. Do not attempt to install any other
bolts.
(6) Connect sensor pigtail harness electrical con-
nector to main wiring harness.
Sensor With 2–Nut Mounting:
(7)
Install and tighten two sensor mounting nuts
to 12 N·m (9 ft. lbs.) torque.
(8) Connect sensor pigtail harness electrical con-
nector to main wiring harness.
Sensor
With
One-Bolt
Mounting
(Not
Equipped With 42 RLE Automatic Transmis-
sion):
New replacement sensors will be equipped with a
paper spacer glued to bottom of sensor. If installing
(returning) a used sensor to vehicle, a new paper
spacer must be installed to bottom of sensor. This
spacer will be ground off the first time engine is
started. If spacer is not used, sensor will be broken
the first time engine is started.
(9) New Sensors: Be sure paper spacer is installed
to
bottom
of
sensor.
If
not,
obtain
spacer
PN05252229.
(10) Used Sensors: Clean bottom of sensor and
install spacer PN05252229.
(11) Install sensor into transmission bellhousing
hole.
(12) Push sensor against flywheel/drive plate. With
sensor pushed against flywheel/drive plate, tighten
mounting bolt to 7 N·m (60 in. lbs.) torque.
(13) Connect sensor pigtail harness electrical con-
nector to main wiring harness.
Fig. 8 CKP - TWO-NUT MOUNTING
1 - TRANSMISSION BELLHOUSING
2 - MOUNTING NUTS (2)
3 - CRANKSHAFT POSITION SENSOR
4 - MOUNTING STUDS (2)
5 - RUBBER GROMMET
6 - SENSOR PIGTAIL
Fig. 9 CKP - TWO-BOLT MOUNTING
1 - TRANSMISSION BELLHOUSING
2 - MOUNTING BOLTS (2)
3 - CRANKSHAFT POSITION SENSOR
4 - RUBBER GROMMET
5 - SENSOR PIGTAIL
14 - 26
FUEL INJECTION
TJ
CRANKSHAFT POSITION SENSOR (Continued)
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