Dodge Viper SRT-10 (ZB). Manual — part 223

Fig. 7 Static Unbalance & Balance

1 - HEAVY SPOT
2 - CENTER LINE OF SPINDLE
3 - ADD BALANCE WEIGHTS HERE

4 - CORRECTIVE WEIGHT LOCATION
5 - TIRE OR WHEEL TRAMP, OR WHEEL HOP

Fig. 8 Dynamic Unbalance & Balance

1 - CENTER LINE OF SPINDLE
2 - ADD BALANCE WEIGHTS HERE

3 - CORRECTIVE WEIGHT LOCATION
4 - HEAVY SPOT WHEEL SHIMMY AND VIBRATION

22 - 4

TIRES/WHEELS

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TIRES/WHEELS (Continued)

(1) Measure the total indicator runout on the cen-

ter of the tire tread rib. Record the indicator reading.
Mark the tire to indicate the high spot. Place a mark
on the tire at the valve stem location (Fig. 9).

(2)

Break down the tire and remount it 180

degrees on the rim (Fig. 10).

(3) Measure the total indicator runout again. Mark

the tire to indicate the high spot.

(4) If runout is still excessive (in excess of 1.524

mm or 0.060 in.), the following procedures must be
done.

• If the new high spot is within 102 mm (4.0 in.)

of the first spot on the tire and is still excessive,
replace the tire.

• If the new high spot is within 102 mm (4.0 in.)

of the first spot on the wheel, the wheel may be out
of specifications. (Refer to 22 - TIRES/WHEELS/
WHEELS - DIAGNOSIS AND TESTING).

• If the new high spot is NOT within 102 mm (4.0

in.) of either high spot, draw an arrow on the tread
from new high spot to first. Break down the tire and
remount it 90 degrees on rim in that direction (Fig.
11), then remeasure runout. This procedure will nor-
mally reduce the runout to an acceptable amount.

Fig. 9 First Measurement On Tire

1 - REFERENCE MARK
2 - 1ST MEASUREMENT
HIGH SPOT MARK TIRE AND RIM
3 - WHEEL
4 - VALVE STEM

Fig. 10 Remount Tire 180 Degrees

1 - VALVE STEM
2 - REFERENCE MARK

Fig. 11 Remount Tire 90 Degrees In Direction of

Arrow

1 - 2ND HIGH SPOT ON TIRE
2 - 1ST HIGH SPOT ON TIRE

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TIRES/WHEELS

22 - 5

TIRES/WHEELS (Continued)

REMOVAL - TIRE AND WHEEL ASSEMBLY

(1) Raise the vehicle. (Refer to LUBRICATION &

MAINTENANCE/HOISTING - STANDARD PROCE-
DURE)

(2) Remove the 6 wheel mounting nuts securing

the wheel to the hub.

(3) Remove the tire and wheel assembly by pulling

it straight away from the hub.

INSTALLATION - TIRE AND WHEEL ASSEMBLY

NOTE: Before installing the wheel on the hub, be
sure to remove any buildup of corrosion on the
mounting surface of the wheel and the hub. Install-
ing wheels without good metal-to-metal contact
could cause loosening of the wheel nuts. This
could adversely affect the safety and handling of
the vehicle.

(1) Position the tire and wheel assembly on the

vehicle by aligning the wheel mounting studs with
the 6 mounting holes in the wheel and slide the
assembly onto the hub.

NOTE: Never use oil or grease on the studs or
wheel attaching nuts.

(2) Install all 6 wheel mounting nuts and lightly

tighten each. Progressively tighten each nut in
sequence to a torque of 122 N·m (90 ft. lbs.) (Fig. 12).

(3) Lower the vehicle.

TIRE PRESSURE MONITORING
(TPM)

DESCRIPTION

This vehicle has a tire pressure monitoring (TPM)

system as standard equipment. It is there to alert
the driver when air pressure in any of the vehicle’s
four tires falls below a predetermined threshold or if
there is a failure in one of the TPM components.
TPM alerts the driver with

9LO TIRE9 displayed in

the cluster odometer and an audible chime tone. For
Operation

information,

(Refer

to

22

-

TIRES/

WHEELS/TIRE PRESSURE MONITORING - OPER-
ATION)

The TPM system utilizes these main components:
• Tire Pressure Monitoring Module

• Tire Pressure Sensor/Transmitters (Four - One

in each wheel)

• Cluster Odometer Message “LO TIRE”

• Body Control Module (communication link)
For information on specific components, refer to

that individual component.

OPERATION

The Tire Pressure Monitoring (TPM) system oper-

ates by monitoring a radio frequency transmission
from the tire pressure sensor/transmitters located in
each wheel, and integrated with the valve stem.
When the vehicle reaches a speed of approximately
32 km/h (20 mph), centrifugal force created by the
wheels rotating closes a roll switch inside each sen-
sor, powering up the circuitry. To facilitate transmit-
ting the radio signal to the TPM module, the valve
stem acts as the antenna for the tire pressure sensor/
transmitter.

The Body Control Module (BCM) monitors the tire

pressure signal that is sent from the TPM module
when the ignition key is in RUN/START position.
When the BCM receives the tire pressure signal it
will send a corresponding bus message to the cluster.
If the BCM message indicates a fault, then the clus-
ter will display in the odometer

9LO TIRE9 and send

a chime request message to the BCM.

POWER UP INITIALIZATION

When the ignition is turned to RUN, the TPM out-

put signal is grounded for 2 seconds, then goes open.
If this sequence does not occur, then the BCM regis-
ters the Tire Module Initialization fault (DTC). Once
this fault is matured (10 seconds), the BCM sends a
bus message to the cluster. The cluster will display
9LO TIRE9 steady on and send a single chime request
to the BCM.

Fig. 12 Wheel Nut Tightening Sequence

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TIRES/WHEELS

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TIRES/WHEELS (Continued)

TIRE DIAGNOSTIC FAULT

Once the RUN/START cycle and initialization of

the TPM is complete, a tire diagnostic fault will be
registered by the TPM if one or more tire sensors are
not transmitting. These sensors start to transmit
data after the wheel has reached a speed of approxi-
mately 32 km/h (20 mph). Because the BCM knows
vehicle speed, it will mask this fault for 70 seconds
after the vehicle speed is greater than 32 km/h (20
mph). Once this 70-second timer has elapsed, the
BCM will monitor the TPM output for a diagnostic
fault. If the TPM output is grounded for greater than
three seconds, the BCM will start to mature the Tire
Module Diagnostic fault and after 10 seconds, send a
bus message to the cluster. The cluster will display
9LO TIRE9 steady on and send a single chime request
to the BCM. If the fault has matured since the last
ignition ON cycle, cycling the ignition switch will not
clear the fault.

NOTE: If a tire is changed, the TPM must be repro-
grammed or this fault will be set.

TIRE LOW PRESSURE

If the TPM module output toggles two (2) seconds

low, then two (2) seconds open for 10 seconds, the
BCM registers the Low Tire Pressure matured fault
and sends a bus message to the cluster. The cluster
will flash

9LO TIRE9 at a rate of two (2) seconds on

and two (2) seconds off and send a single chime
request to the BCM.

TIRE CRITICAL PRESSURE

If the TPM module output toggles one (1) second

low, then one (1) second open for 10 seconds, the
BCM registers Critical Tire Pressure matured fault
and sends a bus message to the cluster. The cluster
will flash

9LO TIRE9 at a rate of one (1) second on

and one (1) second off and send a single chime
request at the same rate to the BCM.

NOTE: Anytime the BCM identifies a faulted condi-
tion (send matured fault message to cluster), it will
register a diagnostic trouble code (DTC).

DIAGNOSIS AND TESTING - TIRE PRESSURE
MONITORING SYSTEM

Diagnostics for the electronic components of the

Tire pressure monitoring system can be done using
the DRBIII

t scan tool and Appropriate Diagnostic

Information.

The tire pressure sensors/transmitters and TPM

module are not repairable components. If either of
these components are found to be at fault or dam-
aged, the component must be replaced. (Refer to 22 -
TIRES/WHEELS/TIRE PRESSURE MONITORING/
SENSOR - REMOVAL) (Refer to 22 - TIRES/
WHEELS/TIRE

PRESSURE

MONITORING/

MODULE - REMOVAL)

SPECIFICATIONS

TIRE PRESSURE MONITORING SYSTEM

DESCRIPTION

SPECIFICATION

Low Pressure Threshold

20 psi

Critical Pressure Thresh-
old

14 psi

Pressure Sensor/Trans-
mitter Mounting Nut
Torque

4 N·m (35 in. lbs.)

MODULE - TPM

DESCRIPTION

The tire pressure monitoring (TPM) system utilizes

a control module to control the system. The TPM
module is located in the instrument panel just to the
left of the instrument cluster gauge pack (Fig. 13).

Fig. 13 TPM Module Location

1 - TPM MODULE
2 - INSTRUMENT CLUSTER GAUGE PACK

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TIRES/WHEELS

22 - 7

TIRE PRESSURE MONITORING (TPM) (Continued)