Without RPO UH3
DTC C0750, C0755, C0760, or C0765 (w/o 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 remote control door lock receiver (RCDLR) receives and translates the data contained in the tire pressure sensor's RF transmissions 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 stops transmitting for 10 minutes.
Action Taken When the DTC Sets
^ A DTC is stored in memory.
^ The driver information center (DIC) displays the SERVICE TIRE MONITOR warning message.
^ The DIC displays the suspect tire pressure as dashes.
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.
^ Some aftermarket wheel valve stem holes are located further form the wheel rim than the original equipment wheels. When using the J-46079 Tire Pressure Monitor Diagnostic Tool to activate a sensor, ensure the tool's antenna is no further than 6 inches from the sensor.
^ The tire pressure sensors transmit on the FM band and are received by the RCDLR through the antenna grid in the vehicles rear window. Visually inspect the antenna grid for any physical damage or poor connections at either end of the antenna coax.
^ Certain types of rear defroster grid malfunctions can create RF interference that may cause a TPM system malfunction. To determine if this condition is present, operate the vehicle within the condition for running and setting the DTC and verify the TPM malfunction only occurs when the rear defroster is turned On.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
2. This step tests if the sensors can transmit valid data with good signal strength in response to a low frequency activation. During this step it is important to observe the signal strength graph on the TPM tool's display screen. Any more that 1/4 graph displayed can be considered good signal strength.
3. This step tests if any sensors are mislocated.
4. This step tests if the RCDLR can receive, learn and translate data contained in simulated sensor transmissions.
6. This step tests if the sensor's internal roll switch is functioning properly.
