With RPO UH3
DTC C0750, C0755, C0760, or C0765 (UH3)
Circuit Description
The Tire Pressure Monitor (TPM) system has a radio frequency (RF) transmitting pressure sensor in each wheel/tire assembly. As vehicle speed increases, centrifugal force closes the sensor's internal roll switch, which puts the sensor into drive mode. The tire pressure receivers receive and convert the sensor's RF transmissions into signal voltages, which are then sent to the tire pressure module where the signal voltages are converted back into RF transmissions. The remote control door lock receiver (RCDLR) receives and translates the data contained in the tire pressure module's RF transmission into sensor presence, sensor mode and tire pressure. Once vehicle speed is 20 mph, or greater, the RCDLR waits for the first sensor to go into drive mode, then checks if all sensors have gone into drive mode. If one or more sensors do not go into drive mode, or do not transmit at all, the RCDLR will set DTC C0750, C0755, C0760, or C0765.
DTC Descriptors
This diagnostic procedure supports the following DTCs:
^ DTC C0750 Left Front Low Tire Pressure Sensor
^ DTC C0755 Right Front Low Tire Pressure Sensor
^ DTC C0760 Left Rear Low Tire Pressure Sensor
^ DTC C0765 Right Rear Low Tire Pressure Sensor
Conditions for Running the DTC
Vehicle speed is at least 32 km/h (20 mph).
Conditions for Setting the DTC
Any given sensor does not go into drive mode or does not transmit at all for 20 minutes.
Action Taken When the DTC Sets
^ The driver information center (DIC) displays the SERVICE TIRE MONITOR warning message.
^ The DIC displays the suspect tire pressure as dashes.
^ A DTC is stored in memory.
Conditions for Clearing the DTC
^ A current DTC will clear when the malfunction is no longer present.
^ A history DTC will clear after 100 consecutive ignition cycles.
Diagnostic Aids
^ Sensors can become mislocated due to previous tire rotations where the sensor learn procedure was not performed. Always learn the sensors to ensure the DTC set is for that actual physical corner of the vehicle. Refer to Tire Pressure Sensor Learn.
^ Occasionally, sensor transmissions are not received by the driver side antenna module due to vehicle level radio frequency interference.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
2. This step tests if the sensors internal battery level is low.
4. This step tests if the sensor is malfunctioning. If the absence of horn chirp during the learn procedure in this step follows the relocated sensor, the malfunction is in the sensor.
5. This step tests if the sensor's internal roll switch is functioning properly.
6. This step tests if the tire pressure receiver is functioning properly. If the absence of a horn chirp during the learn procedure in this step follows the relocated tire pressure receiver, the malfunction is in the tire pressure receiver.
12. This step tests if the malfunction is in the RCDLR.
