Pinpoint Test D: Tire Pressure Monitoring System (TPMS) Warning Indicator On Continuously and Message Center Displays LOW TIRE

Tire Pressure Monitoring System (TPMS)

Pinpoint Test D: Tire Pressure Monitoring System (TPMS) Warning Indicator On Continuously and Message Center Displays LOW TIRE PRESSURE

Normal Operation

The Tire Pressure Monitor (TPM) module monitors the tire pressure of all 4 road tires. The wheel-mounted tire pressure sensors transmit data via radio frequency signals to the TPM (Tire Pressure Monitor) module. The TPM (Tire Pressure Monitor) module is a radio receiver that collects the tire pressure data from the Tire Pressure Monitoring System (TPMS) tire pressure sensors. The data is then sent to the Body Control Module (BCM) where a predetermined pass/fail criteria is applied. The TPMS (Tire Pressure Monitoring System) sensor radio transmissions are sent approximately once every 60 seconds when the vehicle speed exceeds 32 km/h (20 mph). The BCM (Body Control Module) compares each TPMS (Tire Pressure Monitoring System) sensor transmission against a low-pressure limit. If it has been determined that the tire pressure has fallen below this limit, the BCM (Body Control Module) communicates this on the vehicle communication bus to the Instrument Panel Cluster (IPC). The IPC (Instrument Panel Cluster) then illuminates the TPMS (Tire Pressure Monitoring System) warning indicator and displays the appropriate message(s) in the message center.

This symptom can also be caused by a spare tire currently being used in place of a road tire. Make sure the spare tire is not currently in use.

This pinpoint test is intended to diagnose the following:

- Tire pressure not set to specifications listed on the Vehicle Certification (VC) label

- Spare tire currently in use

- TPMS (Tire Pressure Monitoring System) sensor(s)

PINPOINT TEST D : TPMS (Tire Pressure Monitoring System) WARNING INDICATOR ILLUMINATES CONTINUOUSLY AND MESSAGE CENTER DISPLAYS LOW TIRE PRESSURE

NOTE: Use only the Digital Tire Pressure Gauge any time tire pressures are measured to be sure that accurate values are obtained.

NOTE: If a warranty case is opened for an actual TPMS (Tire Pressure Monitoring System) fault, document and include the actual tire pressure data in all warranty communications.

D1 CHECK FOR SPARE TIRE IN USE

NOTE: The spare tire is not programmable even if it is equipped with a TPMS (Tire Pressure Monitoring System) sensor. If a damaged road wheel is located in the trunk, the sensor may still be recognized by the TPMS (Tire Pressure Monitoring System) as low. Make sure the spare tire is not currently in use. To restore TPMS (Tire Pressure Monitoring System) functionality, repair the damaged road wheel and re-mount it to the vehicle.

- Check spare tire location.

Is the spare tire in use?

Yes
REPAIR and REMOUNT the wheel to the vehicle. REFER to Wheel and Tire . ADJUST tire pressures to the required pressure as defined on the Vehicle Certification (VC) label located in the driver door jam. TEST the system for normal operation.

No
GO to D2.

D2 CHECK FOR LOW TIRE PRESSURE

- Using the Digital Tire Pressure Gauge, measure and record the tire pressure in all 4 road tires.

- Adjust the pressure for those found to be below the specification listed on the VC (Vehicle Certification) label.

- Activate each sensor at least twice with the training tool or customer activation tool to make sure the module gets the latest tire pressure data. Refer to Tire Pressure Monitoring System (TPMS) Sensor Activation or drive the vehicle for at least 2 minutes above 32 km/h (20 mph) to clear the low pressure warning. Do not train the sensors at this time.

Has the TPMS (Tire Pressure Monitoring System) warning indicator gone out?

Yes
The system is operating correctly at this time. The cause was low tire pressure.

No
GO to D3

D3 CHECK FOR STUCK TPMS (Tire Pressure Monitoring System) SENSOR

- Ignition OFF.

- Connect the scan tool.

- Ignition ON.

- Enter the following diagnostic mode on the scan tool: BCM (Body Control Module) DataLogger.

- Monitor and record the following tire pressure PIDs (Parameter Identifications) :
- TPM_PRES_LF
- TPM_PRES_RF
- TPM_PRES_LRO
- TPM_PRES_RRO


- Using the Digital Tire Pressure Gauge, measure the actual tire pressures.

- Compare the tire pressure PIDs (Parameter Identifications) with the actual tire pressures.

Do the compared tire pressure values match within ± 5 psi?

Yes
REFER to Instrument Panel, Gauges and Warning Indicators to diagnose the TPMS (Tire Pressure Monitoring System) warning indicator light.

No
INSTALL a new TPMS (Tire Pressure Monitoring System) sensor(s). REFER to Tire Pressure Monitoring System (TPMS) Sensor .