Dodge Viper SRT-10 (ZB). Manual — part 224
OPERATION
The tire pressure monitoring (TPM) module has a
microprocessor controller that can monitor the trans-
missions from the sensor/transmitters anytime the
ignition is on. It will store the last 32 transmissions;
however, they cannot be observed as they occur using
a
DRBIII
t. There are three important values
included in these transmissions. They are:
• Why the transmission was sent,
• From which sensor it came (LF, RF, LR, RR),
and
• Pressure
The module compares the transmitted tire pressure
to the two pressure thresholds (low pressure or crit-
ical pressure). If the module determines that the tire
pressure transmitted is below the low or critical pres-
sure thresholds, it will signal for the “LO TIRE”
pressure warning lamp to come on.
The TPM module performs diagnostic routines,
stores diagnostic trouble codes and provides the
appropriate indicator status to the body control mod-
ule (BCM). When the module determines there is a
fault, the BCM will send a message to the cluster to
turn on the
9LO TIRE9 message in the odometer.
The TPM module also stores its own identification
number, each of the four sensor/transmitter identifi-
cation numbers, module version and the date of man-
ufacture.
STANDARD PROCEDURE - TPM MODULE
PROGRAMMING
If a TPM module fails, or one or more tire pressure
sensor/transmitters fail, after replacement, the TPM
module’s diagnostic memory must be cleared and
reprogrammed. This is necessary for the module to
detect which wheel is sending the signal.
Refer to the following procedure to program the
module for identification of one new or all tire pres-
sure sensor/transmitters.
NOTE: The vehicle’s tires must not have been
rotated above 8 km/h (5 mph) in the last two min-
utes prior to programming.
(1) Connect a DRBIII
t scan tool to the vehicle’s
diagnostic connector beneath the instrument panel,
to the right of the steering column.
(2) Access the Chassis System using the DRBIII.
(3) Once in the Chassis System, select Tire Pres-
sure Monitor, followed by Miscellaneous.
(4) Select the appropriate function from the next
screen displaying the following options:
• Program LF Pressure Sensor
• Program RF Pressure Sensor
• Program RR Pressure Sensor
• Program LR Pressure Sensor
• Program Module (4 Sensors)
• Monitor
(5) Place a magnet, special tool 8821, at the valve
stem for that wheel as directed by the DRBIII. If the
Program Module function has been chosen, the
DRBIII will direct you to the left front wheel pres-
sure sensor/transmitter first.
(6) When that wheels pressure sensor/transmitter
has been programmed, the DRBIII will display Pro-
gram Transmitter Complete or will automatically
direct you to the next wheel sensor/transmitter to be
programmed.
NOTE: When programming the module (all four sen-
sor/transmitters), the magnet should be moved from
wheel to wheel in a clockwise direction starting at
the left front wheel.
(7) Remove the magnet and if programming the
entire module, move the magnet to each of the
remaining wheels as directed by the DRBIII. Each
sensor/transmitter will automatically sense the pres-
ence of the magnet and begin programming.
(8) Once Program Transmitter Complete is dis-
played, exit the program function screen.
(9) Verify that the module programming is com-
plete by looking at the tire pressure sensor/transmit-
ter ID’s in the Sensor Display using the DRBIII.
REMOVAL
(1) Disconnect the battery negative terminal.
(2) Access and remove the instrument cluster
gauge pack (Fig. 13). (Refer to 8 - ELECTRICAL/IN-
STRUMENT CLUSTER/GAUGES - REMOVAL)
(3) Disconnect the wiring harness from the TPM
module.
(4) Remove the two mounting screws.
(5) Remove the TPM module.
INSTALLATION
(1) Place TPM module on instrument panel. Align
the mounting holes.
(2) Install the mounting screws.
(3) Connect the wiring harness connector to the
TPM module.
(4) Install the instrument cluster gauge pack and
all components removed to access it. (Refer to 8 -
ELECTRICAL/INSTRUMENT CLUSTER/GAUGES -
INSTALLATION)
(5) Program the identification code from each tire
pressure transmitter into the new TPM module.
(Refer to 22 - TIRES/WHEELS/TIRE PRESSURE
MONITORING/MODULE
-
STANDARD
PROCE-
DURE)
22 - 8
TIRES/WHEELS
ZB
MODULE - TPM (Continued)
(6) Verify that the module has been programmed
with the identification code of all four of the tire
pressure sensor/transmitters using the DRBIII
t scan
tool. Also check the tire pressure value from each tire
pressure sensor/transmitter. If these are present in
the receivers memory the receiver has been correctly
programmed.
(7) Road test the vehicle to verify the proper func-
tion of the tire pressure monitoring system.
SENSOR - TPM
DESCRIPTION
A tire pressure sensor/transmitter is installed in
each wheel of this vehicle as part of the tire pressure
monitoring system (Fig. 14). A special valve stem
incorporated into each tire pressure sensor/transmit-
ter attaches it to the wheel.
VALVE STEM CORE AND CAP
On this vehicle, the valve stem is part of the tire
pressure
sensor/transmitter
and
is
used
as
its
antenna. If corrosion were to develop in the valve
stem, it would affect the ability of the tire pressure
sensor/transmitter to send the radio frequency signal
to the TPM module.
The valve stem used on this vehicle is made from
aluminum. Corrosion of aluminum will be caused by
putting a dissimilar metal in contact with it. To pre-
vent this type of corrosion from developing within the
valve stem, the core of the valve stem is made of a
compatible metal and is specially coated.
For this reason, a standard valve stem core must
never be installed in this valve stem. If the core of
the valve stem is removed when servicing the tire,
the original valve stem core must be reinstalled. If
the valve stem core needs to be replaced, it must be
replaced with an original equipment valve stem core.
The valve stem caps used on this vehicle are spe-
cially designed for their use on the valve stem of the
tire pressure sensor/transmitter. Each valve stem cap
has an O-ring in the upper end of the valve stem cap
to provide a positive seal at the end of the valve
stem. This keeps dirt contamination and corrosion
out of the valve stem caused by moisture. As listed
earlier, these conditions can affect the ability of the
tire pressure transmitter to send the radio frequency
signal to the TPM module.
CAUTION: Be sure that an original equipment valve
stem cap or a valve stem cap of the same sealing
capability is always used if the valve stem cap
requires replacement.
OPERATION
Each tire pressure sensor/transmitter serves three
functions:
• It is used as a valve stem to inflate and deflate
the tire.
• It periodically measures tire pressure.
• It transmits the tire pressure value to the TPM
module in the vehicle.
The system operates by monitoring a radio fre-
quency transmission from the sensor/transmitters
located in each wheel. When the vehicle reaches a
speed of approximately 32 km/h (20 mph), centrifugal
force created by the rotating wheels closes a roll
switch inside each sensor/transmitter, powering up
the circuitry. The sensor/transmitters will only send
out information while the vehicle is operating at
speeds above 32 km/h (20 mph). To facilitate trans-
mitting the radio signal to the TPM module, the tire
valve stems act as antennas for the tire pressure sen-
sor/transmitters.
Each tire pressure sensor/transmitter is powered
by an internal battery. The battery is not replaceable
separately. In the event of battery failure, the entire
tire pressure sensor at that wheel will require
replacement. To extend the life of the battery, the
sensor/transmitter is not activated until the vehicle
reaches a speed of approximately 32 km/h (20 mph)
as stated earlier. Each tire pressure sensor/transmit-
ter has a unique identity code. This allows the TPM
system to indicate to a technician, through diagnostic
trouble codes in the module, which tire of the vehicle
has lost air pressure. This code is also used to iden-
tify to a technician which pressure sensor/transmit-
ter has set a diagnostic trouble code. For this reason,
if a tire pressure sensor needs to be replaced, the
new sensor must be programmed to have its identity
code recognized by the receiver.
Fig. 14 Sensor Mounting To Wheel
1 - TIRE PRESSURE SENSOR
2 - WHEEL
3 - NUT
ZB
TIRES/WHEELS
22 - 9
MODULE - TPM (Continued)
REMOVAL
(1) Remove the tire and wheel assembly from the
vehicle. (Refer to 22 - TIRES/WHEELS - REMOVAL)
CAUTION: When removing the stick on balancing
weights from the wheel, do not use an abrasive
cleaner or a cleaner which will damage the protec-
tive finish on the wheel.
(2) Remove the balancing weights from the wheel.
NOTE: The cap used on this valve stem contains an
O-ring seal to prevent contamination and moisture
from entering the valve stem. Retain this valve stem
cap for re-use. Do not substitute a regular valve
stem cap in its place.
(3) Remove the cap from the valve stem.
NOTE: The valve stem used on this vehicle is made
of aluminum and the core is nickel plated brass.
The original valve stem core must be reinstalled
and not substituted for a valve stem core made of a
different material. This is required to prevent corro-
sion in the valve stem caused by the different met-
als.
(4) Using the appropriate tool, remove the core
from the valve stem (Fig. 15).
(5) Let the tire fully deflate.
CAUTION:
The
pressure
transmitter
must
be
removed from the wheel and dropped into the tire
prior to breaking the bead and dismounting the tire.
Failure to do this will greatly increase the risk of
damaging the pressure transducer when servicing
the tire.
(6) Remove nut mounting valve stem of pressure
sensor/transmitter to the wheel (Fig. 16). Drop sen-
sor/transmitter into tire.
CAUTION: When breaking the top and bottom bead
of the tire off the wheel, care must be used so the
bead breaking mechanism on the tire changer does
not damage the wheel. This includes the surface of
the wheel flange on the inside of the wheel.
(7) Using the tire changer manufacturers proce-
dure, first break down the upper bead of the tire.
Then break down the bottom bead of the tire.
CAUTION: When dismounting the upper tire bead
from the wheel, the proper procedure must be used.
Not using the proper procedure will result in dam-
age to the wheel and tire. (Refer to 22 - TIRES/
WHEELS - DISASSEMBLY)
(8) Dismount the upper bead of the tire from the
wheel. The upper bead must be fully dis-
mounted from the wheel to remove the tire
pressure transmitter from the inside of the tire.
The bottom bead of the tire does not need to be
removed from the wheel. (Refer to 22 - TIRES/
WHEELS - DISASSEMBLY)
Fig. 15 Removing Valve Stem Core (Typical)
1 - WHEEL
2 - VALVE STEM
3 - TIRE
4 - VALVE STEM CORE TOOL
Fig. 16 Valve Stem/Pressure Transmitter (Typical)
1 - NUT
2 - WHEEL
3 - TIRE
4 - VALVE STEM
22 - 10
TIRES/WHEELS
ZB
SENSOR - TPM (Continued)
(9) Pull upward on the tire (Fig. 17). Reach inside
the tire and remove the pressure sensor/transmitter.
INSTALLATION
NOTE: When installing the tire pressure sensor/
transmitter, replace the sealing grommet at the
valve stem base before installing the pressure
transmitter in the wheel. Also, be sure the surface
of the wheel that the grommet seals against is
clean and not damaged.
(1) Install the tire pressure sensor/transmitter on
the wheel (Fig. 18).
(2) Install the special sensor mounting nut. When
tightening the tire pressure sensor/transmitter nut,
hold the sensor so it does not rotate. Once tightened,
the gap between the sensor and the wheel must be
even on both sides as shown (Fig. 19). If the sensor/
transmitter rotates (clocks), damage to the sensor/
transmitter can occur when mounting the tire.
Tighten the nut to a torque of 4 N·m (35 in. lbs.).
CAUTION: When mounting the upper bead of the
zero pressure tire, the proper procedure must be
used. Not using the proper procedure will result in
damage to the wheel and tire.
(3) Mount the upper bead of the tire on the wheel.
(4) Install the original or an OEM replacement
valve stem cap on the valve stem.
(5) Using a soap solution, check that no air leak is
present where the valve stem mounts to the wheel.
(6) Balance the tire and wheel assembly using the
correct
procedure
for
wheel
flange
mount
and
stick-on wheel weights. For balancing information
and wheel weight positioning, (Refer to 22 - TIRES/
WHEELS - STANDARD PROCEDURE).
(7) Install the tire wheel assembly on the vehicle.
(Refer to 22 - TIRES/WHEELS - INSTALLATION)
(8) Program the identification code for the new tire
pressure sensor/transmitter into the TPM module.
(Refer to 22 - TIRES/WHEELS/TIRE PRESSURE
MONITORING/MODULE
-
STANDARD
PROCE-
DURE)
Fig. 17 Pressure Transmitter Removal (Typical)
1 - TIRE
2 - WHEEL
3 - PRESSURE SENSOR/TRANSMITTER
Fig. 18 Sensor Mounting To Wheel
1 - TIRE PRESSURE SENSOR
2 - WHEEL
3 - NUT
Fig. 19 Sensor Correctly Mounted In Wheel
1 - WHEEL
2 - GAP SHOULD BE EVEN AT BOTH THESE POINTS
ZB
TIRES/WHEELS
22 - 11
SENSOR - TPM (Continued)
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