Dodge ZB 2005 Service Manual page 898

ZB
TIRE PRESSURE MONITORING (TPM) (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
LO TIRE 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 LO TIRE 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 LO TIRE 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 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
MODULE - REMOVAL)
SPECIFICATIONS
TIRE PRESSURE MONITORING SYSTEM
DESCRIPTION
Low Pressure Threshold
Critical Pressure Thresh-
old
Pressure Sensor/Trans-
mitter Mounting Nut
Torque
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
TIRES/WHEELS 22 - 7
MONITORING/
SPECIFICATION
20 psi
14 psi
4 N·m (35 in. lbs.)