2003 JEEP GRAND CHEROKEE steering knuckle

ELECTRIC BRAKE
DESCRIPTION
The electronic brake distribution (EBD) functions
like a rear proportioning valve. The EBD system uses
the ABS system to control the slip of the rear wheels
in partial braking range. The braking force of the
rear wheels is controlled electronically by using the
inlet and outlet valves located in the HCU.
OPERATION
Upon entry into EBD the inlet valve for the rear
brake circuit is switched on so that the fluid supply
from the master cylinder is shut off. In order to
decrease the rear brake pressure the outlet valve for
the rear brake circuit is pulsed. This allows fluid to
enter the low pressure accumulator (LPA) in the
HCU resulting in a drop in fluid pressure to the rear
brakes. In order to increase the rear brake pressure
the outlet valve is switched off and the inlet valve is
pulsed. This increases the pressure to the rear
brakes. This will continue until the required slip dif-
ference is obtained. At the end of EBD braking (no
brake application) the fluid in the LPA drains back to
the master cylinder by switching on the outlet valve
and draining through the inlet valve check valve. At
the same time the inlet valve is switched on to pre-
vent a hydraulic short circiut in case of another
brake application.
The EBD will remain functional during many ABS
fault modes. If the red and amber warning lamps are
illuminated the EBD may have a fault.
FRONT WHEEL SPEED
SENSOR
DESCRIPTION
A wheel speed sensor is used at each wheel. The
front sensors are mounted to the steering knuckles.
The rear sensors are mounted at the outboard end of
the axle. Tone wheels are mounted to the outboard
ends of the front and rear axle shafts. The gear type
tone wheel serves as the trigger mechanism for each
sensor.
OPERATION
The sensors convert wheel speed into a small digi-
tal signal. The CAB sends 12 volts to the sensors.
The sensor has an internal magneto resistance
bridge that alters the voltage and amperage of the
signal circuit. This voltage and amperage is changed
by magnetic induction when the toothed tone wheel
passes the wheel speed sensor. This digital signal issent to the CAB. The CAB measures the voltage and
amperage of the digital signal for each wheel.
REMOVAL
(1) Raise and support the vehicle.
(2) Remove the front wheel sensor mounting bolt
(Fig. 1).
(3) Remove the sensor from the steering knuckle.
(4) Disengage the sensor wire from the brackets
(Fig. 1)on the steering knuckle.
(5) Disconnect the sensor from the sensor harness
(Fig. 2)and (Fig. 3).
(6) Remove the sensor and wire.
INSTALLATION
(1) Install the sensor on the steering knuckle.
(2) Apply Mopar Lock N' Seal or Loctitet242 to
the sensor mounting bolt. Use new sensor bolt if orig-
inal bolt is worn or damaged.
(3) Install the sensor mounting bolt and tighten
bolt to 12-14 N´m (106-124 in. lbs.).
(4) Engage the grommets on the sensor wire to the
steering knuckle brackets.
(5) Connect the sensor wire to the harness connec-
tor.
(6) Check the sensor wire routing. Be sure the
wire is clear of all chassis components and is not
twisted or kinked at any spot.
(7) Remove the support and lower vehicle.
Fig. 1 Sensor Location
1 - BRACKET
2 - BRACKET
3 - WHEEL SPEED SENSOR
4 - MOUNTING BOLT
WJBRAKES - ABS 5 - 43

(3) Connect the harness to the switch. Be sure the
harness connector is firmly seated.
(4) Place the carpet in position and fold the rear
seat back down.
REAR WHEEL SPEED SENSOR
DESCRIPTION
A wheel speed sensor is used at each wheel. The
front sensors are mounted to the steering knuckles.The rear sensors are mounted at the outboard end of
the axle. Tone wheels are mounted to the outboard
ends of the front and rear axle shafts. The gear type
tone wheel serves as the trigger mechanism for each
sensor.
OPERATION
The sensors convert wheel speed into a small digi-
tal signal. The CAB sends 12 volts to the sensors.
The sensor has an internal magneto resistance
bridge that alters the voltage and amperage of the
signal circuit. This voltage and amperage is changed
by magnetic induction when the toothed tone wheel
passes the wheel speed sensor. This digital signal is
sent to the CAB. The CAB measures the voltage and
amperage of the digital signal for each wheel.
REMOVAL
(1) Raise and fold the rear seat forward. Then
move the carpeting aside for access to the rear sensor
connectors.
(2) Disconnect the rear sensor wire at the harness
connectors (Fig. 7).
(3) Push the sensor wires and grommets through
the floorpan holes.
(4) Raise and support the vehicle.
(5) Disengage the sensor wire from the axle and
the chassis brackets and from the brake line retain-
ers.
(6) Remove the sensor mounting bolt from the rear
brake backing plate. (Fig. 8).
(7) Remove the sensor from the backing plate.
Fig. 5 G-Switch Mounting
1 - MOUNTING BOLTS
2 - CONNECTOR
3 - G-SWITCH
Fig. 6 G-Switch
1 - SWITCH PART NUMBER
2 - ARROW INDICATES FRONT OF SWITCH FOR PROPER
MOUNTING
Fig. 7 Rear Sensor Connector
1 - RIGHT REAR WHEEL SPEED SENSOR CONNECTOR
2 - LEFT REAR WHEEL SPEED SENSOR CONNECTOR
3 - G-SWITCH SENSOR
4 - PARKING BRAKE CABLES
WJBRAKES - ABS 5 - 45
G-SWITCH (Continued)

SPECIFICATIONS
TORQUE CHART
TORQUE SPECIFICATIONS
DESCRIPTION N´m Ft. Lbs. In. Lbs.
Pitman Arm
Shaft Nut251 185 Ð
Drag Link
Pitman Arm Nut88 65 Ð
Drag Link
Knuckle Nut47 35 Ð
Drag Link
Clamp Nuts41 30 Ð
Tie Rod
Knuckle Nut47 35 Ð
Tie Rod
Clamp Nuts41 30 Ð
Steering Damper
Axle Bolt88 65 Ð
Steering Damper
Tie Rod Nut41 30 Ð
SPECIAL TOOLS
STEERING LINKAGEDAMPER
DESCRIPTION
The damper is mounted to the axle housing and
the tie rod end. The damper consists of steel tube
shock absorber with a permanent bushed end.
OPERATION
The steering damper provides steering system
damping.
REMOVAL
(1) Remove the nut from the ball stud at the tie
rod.
(2) Remove the steering damper from the tie rod.
(3) Remove the steering damper nut and bolt from
the axle bracket (Fig. 3) .Puller C-3894±A
Remover Pitman C-4150A
19 - 28 LINKAGEWJ
LINKAGE (Continued)

INSTALLATION
(1) Install the steering damper to the axle bracket
and tie rod.
(2) Install the steering damper bolt in the axle
bracket and tighten bolt to 88 N´m (65 ft. lbs.).
(3) Install the nut at the tie rod and tighten to 41
N´m (30 ft. lbs.).
DRAG LINK
DESCRIPTION
The drag link and ends are comprised of two forged
ends connected by a steel adjusting tube. The drag
link connects the steering gear pitman arm to the
steering knuckle. The larger offset end is attached to
the pitman arm.
OPERATION
The sleeve is used for steering wheel centering.
REMOVAL
(1) Raise and support the vehicle.
(2) Remove right wheel and tire assembly.
(3) Remove the cotter pins and nuts at the right
steering knuckle and pitman arm (Fig. 4) .
(4) Remove the drag link from the steering
knuckle and pitman arm Puller C-3894-A.
(5) Loosen adjustment sleeve clamp bolts and
unscrew the tie rod ends from the adjustment sleeve.
INSTALLATION
(1) Screw the tie rod ends into the adjustment
sleeve.
(2) Install the drag link onto the right steering
knuckle and pitman arm.(3) Tighten the nut at the steering knuckle to 47
N´m (35 ft. lbs.). Tighten the pitman nut to 88 N´m
(65 ft. lbs.). Install new cotter pins.
(4) Position clamp bolts to their original position
and tighten to 41 N´m (30 ft. lbs.).
(5) Install right wheel and tire assembly.
(6) Remove support and lower the vehicle.
(7) Center the steering wheel.
PITMAN ARM
DESCRIPTION
The pitman arm is attached at one end of the
steering gear's sector shaft. The other end is con-
nected to the drag link.
OPERATION
The pitman arm transfers rotary motion into side
to side motion.
REMOVAL
(1) Remove the cotter pin and nut from the drag
link at the pitman arm (Fig. 5) .
(2) Remove the drag link ball stud from the pit-
man arm with a puller.
(3) Remove the nut and washer from the steering
gear shaft. Mark the pitman shaft and pitman arm
for installation reference. Remove the pitman arm
from steering gear with Puller C-4150A.
Fig. 3 Steering Damper
1 - DAMPER
2 - TIE ROD
Fig. 4 Drag Link
1 - STEERING GEAR
2 - PITMAN ARM
3 - CLAMP
4 - DRAG LINK
5 - CLAMP
WJLINKAGE 19 - 29
DAMPER (Continued)

INSTALLATION
(1) Align and install the pitman arm on steering
gear shaft.
(2) Install the washer and nut on the shaft and
tighten the nut to 251 N´m (185 ft. lbs.).
(3) Install drag link ball stud to pitman arm.
Install nut and tighten to 88 N´m (65 ft. lbs.). Install
a new cotter pin.
TIE ROD END
DESCRIPTION
The ends are forged, with a lubed for life ball
socket.
OPERATION
The tie rod ends connect the drag link to the wheel
assembly. The tie rod provides toe alignment and
transfers steering input from the drag link to the
wheels.
REMOVAL
(1) Raise and support the vehicle.
(2) Remove wheel and tire assemblies.
(3) Remove the damper nut from the tie rod clamp
(Fig. 6).
(4) Remove the damper from the tie rod.
(5) Remove the cotter pins and nuts from the tie
rod ends at the steering knuckles (Fig. 6).(6) Remove the tie rod ends from the steering
knuckles with Puller C-3894-A..
(7) Loosen the adjustment sleeve clamp bolts and
unscrew the tie rod ends from the sleeve.
INSTALLATION
(1) Screw the tie rod ends into the adjustment
sleeve.
(2) Install the tie rod on the steering knuckles and
install the nuts.
(3) Tighten the nuts to 47 N´m (35 ft. lbs.). Install
new cotter pins and bend end 60É.
(4) Position the adjustment sleeve clamp bolts to
their original location and tighten to 41 N´m (30 ft.
lbs.).
(5) Install the damper on the tie rod and install
the nut.
(6) Tighten the nut to 41 N´m (30 ft. lbs.). Install
new cotter pins and bend end 60É.
(7) Install wheel and tire assemblies.
(8) Remove support and lower the vehicle.
(9) Perform toe position adjustment.
Fig. 5 Pitman Arm
1 - STEERING GEAR
2 - PITMAN ARM
Fig. 6 Tie Rod Assembly
1 - TIE ROD END
2 - CLAMP
3 - DAMPER
4 - TIE ROD
5 - CLAMP
6 - TIE ROD END
19 - 30 LINKAGEWJ
PITMAN ARM (Continued)