C0750

DTC C0750, C0755, C0760 or C0765

Circuit Description

The Tire Pressure Monitor (TPM) system has a radio frequency (RF) transmitting pressure sensor inside each wheel/tire assembly. As vehicle speed increases, centrifugal force closes the sensor's internal roll switch which puts the sensors into drive mode. The passenger door module (PDM) receives and translates the data contained in each sensor's RF transmission into sensor presence, sensor mode, and tire pressure. Once vehicle speed is 40 km/h (25 mph), or greater, the PDM waits for the first sensor to go into drive mode then checks if all sensors all sensors have gone into drive mode.

Conditions for Running the DTC

Vehicle speed is 40 km/h (25 mph), or greater for 2 minutes.

Conditions for Setting the DTC

Any given sensor does not go into drive mode, or does not transmit at all for 5 minutes.

Action Taken When the DTC Sets

- A DTC is stored in memory.
- The DIC displays the SERVICE TIRE MONITOR message.

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 malfunction free ignition cycles.
- Using a scan tool.

Diagnostic Aids

- Some aftermarket wheel valve stem holes are located further from the wheel rim than original equipment wheels. When using the J-46079 to activate a sensor, ensure the tool's antenna is no further than 15 cm (6 in) from the sensor.
- The sensor activation procedure may have to be repeated up to 3 times before determining a sensor is malfunctioning.
- Occasionally 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. See Tire Pressure Sensor Learn Procedure.
- Occasionally sensor transmissions are not received by the PDM due to vehicle level RF interference.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

2. Tests if the sensors will 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 after the activate button has been pressed and released. Any more than 1/4 graph displayed can be considered good signal strength.
3. Tests if any sensors are mislocated.
4. Tests if the PDM can receive and translate data from simulated sensor transmissions.
6. Tests if the sensors internal roll switch is functioning properly.