Diagnosis And Testing

Tire Pressure Monitoring (TPM) System Diagnosis 

When diagnosing a tire pressure issue, first check the Tire Pressure Monitoring (TPM) warning light in the Instrument Panel Cluster (IPC) during starting. From the OFF position, turn the ignition switch ON and check the TPM warning light to observe one of the following:

• If after 10 seconds the warning light is on and constant (not flashing), then one or more of the tires has low pressure or another fault exists.
• If after 10 seconds the warning light flashes for 75 seconds, then remains on constantly, a fault has been detected in the system.

Sensed tire pressure values are also displayed in the Electronic Vehicle Information Center (EVIC).

If the Radio Frequency Hub (RFH) module does not receive a signal from a sensor, dashes will be displayed in lieu of a pressure value.

If a low pressure warning is indicated, check the air pressure in all tires with an accurate pressure gauge. If the pressure in the tire is low, diagnose and repair the cause of the low pressure. Install the tire, or tires, on the vehicle and allow approximately two minutes for the message or warning light to turn off. If the message or warning light remains on, another fault is present.

If a system fault exists, check for the following conditions which may cause a system fault:

• Signal interference due to electronic devices or driving next to facilities emitting the same radio frequencies as the TPM sensors.
• Accumulation of snow or ice around the wheels or wheel housings.
• Using snow chains.
• Using wheels not equipped with TPM sensors.
• Incorrectly programmed Sensor ID numbers.

TPM system DTCs are stored in the RFH. Check for DTCs using diagnosis equipment. The procedure for diagnosing TPM system DTCs can be found in the service information.

If a new sensor is installed, perform one of the following procedures in the TPM diagnosis check test to program the RFH with the new sensor ID.

• Use the TPM-RKE 9936 analyzer, with the diagnosis equipment, to program the TPM module with the tire pressure sensor ID.
• Once the vehicle has remained stationary for more than 20 minutes, the RFH should automatically learn the sensor ID when the vehicle is driven for a minimum of 10 minutes while maintaining a continuous speed above 24 km/h (15 mph).