Jeep Grand Cherokee WK. Manual — part 1567
3. Remove brake caliper and rotor, (Refer to 5 -
BRAKES/HYDRAULIC/MECHANICAL/ROTORS
-
REMOVAL).
4. Remove stud (2) from hub with Remover 8677 (1).
5. Remove the stud (1) from between the hub/bearing
and brake shoes (2)
INSTALLATION
FRONT WHEEL STUD
CAUTION: Do not use a hammer to remove wheel studs.
1. Install the new stud into the hub flange.
2. Install the three washers onto the stud, then install the lug nut with the flat side of the nut against the washers.
3. Tighten the lug nut until the stud is pulled into the hub flange. Verify that the stud is properly seated into the
flange.
4. Remove the lug nut and washers.
5. Install the brake rotor, caliper adapter, and caliper, (Refer to 5 - BRAKES/HYDRAULIC/MECHANICAL/DISC
BRAKE CALIPERS - INSTALLATION).
6. Install the wheel and tire assembly, use new lug nut on stud or studs that were replaced.
7. Remove the support and lower vehicle.
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TIRES/WHEELS
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REAR WHEEL STUD
1. Install the new stud (1) into the hub flange by rotat-
ing the stud (1) in between the hub/bearing and
park brake shoes (2).
2. Install the three washers onto the stud, then install the lug nut with the flat side of the nut against the washers.
3. Tighten the lug nut until the stud is pulled into the hub flange. Verify that the stud is properly seated into the
flange.
4. Remove the lug nut and washers.
5. Install the brake rotor and caliper, (Refer to 5 - BRAKES/HYDRAULIC/MECHANICAL/DISC BRAKE CALIPERS -
INSTALLATION).
6. Install the wheel and tire assembly, use new lug nut on stud or studs that were replaced.
7. Remove the support and lower vehicle.
TIRE PRESSURE MONITORING SYSTEM
DESCRIPTION
BASE TIRE PRESSURE MONITORING
This system will consist of tire pressure monitoring sensors attached to each wheel through the valve stem mount-
ing hole, a central receiver module (WCM) and a amber colored indicator lamp. A sensor shall be installed in the
spare wheel if the vehicle is equipped with a matching full size spare wheel and tire assembly.
PREMIUM TIRE PRESSURE MONITORING
The system will consist of tire pressure monitoring sensors attached to each wheel through the valve stem mounting
hole, a wireless control module (WCM), Three Wheel Sensor transponders are mounted in the wheel wells (2 in the
front and 1 in the rear wheel wells). a re-configurable dot matrix display module and an amber colored ISO standard
Indicator Lamp. A sensor shall be installed in the spare wheel if the vehicle is equipped with a matching full size
spare wheel and tire assembly.
WIRELESS CONTROL MODULE (WCM)
The receiver circuit for the TPM system is integrated into the WCM. The WCM also includes the Remote Keyless
Entry (RKE) receiver and the Sentry Key Immobilizer (SKIM) receiver. All three receivers share a number or com-
mon components. The WCM decodes the RF signals transmitted by each of the vehicle’s tire pressure sensors. The
decoded information is used to determine if
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warning
9
or
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fault
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conditions exist within the TPM system.
The WCM communicates with the module that controls the
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ISO Indicator Lamp
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and the text display (Premium
system), via the vehicle bus system (CAN B).
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TIRES/WHEELS
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Upon detection of a warning or fault condition, the WCM will send a request to illuminate the Indicator Lamp. Also,
upon detection of a warning or fault condition, the display module will send a request to sound the
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chime
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. A chime
will only be requested once per ignition cycle per warning or fault condition detected.
The WCM will store all warning and fault conditions, placard pressure values, low-pressure threshold values and low
pressure threshold hysterisis values in memory that can be accessed through diagnostic communication. If new
sensors are introduced to the vehicle, the data stored for the sensor being replaced will be deleted.
The WCM will store all wheel sensor ID’s and locations and faults in memory that can be accessed through diag-
nostic communication. All other data values transmitted from each wheel sensor shall be stored in the WCM
memory.
OPERATION
BASE TIRE PRESSURE MONITORING
The tire pressure monitoring system is designed to operate without loss of function for all types of standard tire
constructions. (Function with different types of run flat tire constructions needs to be evaluated for each design). The
wheel sensor shall monitor tire pressure, air temperature inside the tire, wheel acceleration and the sensor internal
battery status for all four active road tires. The sensor will broadcast this information, along with a unique 32 bit ID,
to a central receiver circuit located inside the WCM. The information received by the WCM will be decoded and
stored in memory (RAM) in the WCM. If a
9
warning or
9
fault
9
condition exists, the WCM will send a bus message
request to illuminate the amber colored indicator lamp and to sound the chime.
If the WCM detects a warning or fault condition at ignition key
9
on
9
it will wait ten seconds +/- 10 % before sending
the first request to illuminate the Indicator Lamp. This will assure that the display module has concluded its bulb
check period. The display module will request a chime once per ignition cycle for each
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warning
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or
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fault
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condition
detected. A
9
warning
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or
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fault
9
condition will remain enabled until the problem causing the condition is corrected and
removed/reset.
The WCM shall continuously monitor for the receipt of tire pressure RF message transmissions from the wheel
sensors during both the ignition key
9
on
9
and key
9
off
9
cycles. The wheel sensor ID’s and the location of each sen-
sor (e.g. Tire 1, Tire 2 etc.) are stored in the WCM non-volatile memory during the initial Manufacturing Plant Pro-
cess, or during a service procedure, as required. The recommended
9
placard pressure
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,
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low-pressure threshold
9
and “Hysteresis Pressure Values” for the tires installed on the vehicle, are stored in the WCM non-volatile memory
during the initial Manufacturing Plant Process, or during a service procedure, as required. (Note: For vehicles with
optional wheel/tire sizes and significantly different tire placard pressures, the placard pressure value and the low-
pressure threshold value shall be re-programmable by the dealer to accommodate the customer selected wheel/tire
combinations recommended by DaimlerChrysler).
PREMIUM TIRE PRESSURE MONITORING
The tire pressure monitoring system is designed to operate without loss of function for all types of standard tire
constructions. (Function with different types of run flat tire constructions needs to be evaluated for each design). The
wheel sensor shall monitor tire pressure, air temperature inside the tire, wheel acceleration and the sensor internal
battery status for all four active road tires and the spare tire, if so equipped. The sensor will broadcast this infor-
mation, along with a unique 32 bit ID, to a central receiver circuit located inside the WCM. The information received
by the WCM will be decoded and stored in (RAM) memory in the WCM. The WCM will send bus messages to the
re-configurable display module to display the pressures of the four active road tires in vehicle position. The spare
tire pressure is monitored but it is not displayed.
If a
9
warning
9
or
9
fault
9
condition exists, the WCM will send a bus message request to display the text messages
and, when required, illuminate the amber colored ISO Indicator Lamp.
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Warnings
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and
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faults
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are described in more
detail below. If the WCM detects a warning or fault condition at ignition key
9
on
9
it will wait ten seconds +/- 10%
before sending the first request to illuminate the Indicator Lamp and to display the text messages. This will assure
that the display module has concluded its bulb check period. The display module will request a chime once per
ignition cycle for each
9
warning
9
or
9
fault
9
condition detected. A
9
warning
9
or
9
fault
9
condition will remain enabled until
the problem causing the condition is corrected and removed/reset
The WCM shall continuously monitor for the receipt of tire pressure RF message transmissions from the wheel
sensors during both the ignition key
9
on
9
and key
9
off
9
cycles. The wheel sensor ID’s and the location of each sen-
sor (e.g. Left Front, Right Front etc.) are stored in the WCM non-volatile memory during the initial Manufacturing
Plant Process, or during a service procedure, as required. The recommended
9
placard pressure
9
,
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low-pressure
threshold
9
and Hysteresis Pressure Values for the tires installed on the vehicle, are stored in the WCM non-volatile
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TIRES/WHEELS
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memory during the initial Manufacturing Plant Process, as described later in this document or during a service pro-
cedure as required. (Note: For vehicles with optional wheel/tire sizes and significantly different tire placard pres-
sures, the placard pressure value and the low-pressure threshold value shall be re-programmable by the dealer to
accommodate the customer selected wheel/tire combinations recommended by DaimlerChrysler).
DIAGNOSIS AND TESTING - TIRE PRESSURE MONITORING SYSTEM
All Tire Pressure Monitoring System Faults are specific to one location. If a
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BATTERY LOW
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or
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SENSOR FAIL-
URE
9
fault is detected, the location will be displayed (Premium Systems). The appropriate sensor/transmitter can
then be replaced. If a single sensor/transmitter cannot be detected by the WCM, replace that sensor transmitter. If
none of the sensors/transmitters can be detected, refer to symptoms in the WCM section. For additional system
description and diagnosis, refer to Tire Pressure Monitoring in the Body Diagnostic manual.
SPECIFICATIONS
TORQUE CHART
TORQUE SPECIFICATIONS
DESCRIPTION
N·m
Ft. Lbs.
In. Lbs.
Tire Pressure Sensor/
Transmitter
Mounting Nut
7.5
—
66
Transponder
Front
4
—
35
Transponder
Rear
3
—
25
SENSOR
DESCRIPTION
On vehicles equipped with Tire Pressure Monitoring
(TPM), one tire pressure sensor (6) is mounted to
each wheel (5) in place of the traditional tire valve
stem. Each sensor has an internal battery that lasts
up to 10 years. The battery is not serviceable. At the
time of battery failure, the sensor must be replaced.
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