C0750

DTC C0750, C0755, C0760, or C0765





Circuit Description
The Tire Pressure Monitor (TPM) sensors begin to transmit a unique identification code and radio frequency signal to the Remote Control Door Lock Receiver (RCDLR) when vehicle speed is greater than 32 km/h (20 mph), or the TPM sensors are in power up mode. This information is translated by the RCDLR into tire location and tire pressure. The RCDLR waits for the first sensor to transmit its information 8 times. The RCDLR then checks if all sensors have transmitted their information. If 1 or more sensors do not transmit their information, the RCDLR will set the appropriate DTC for the sensor that did not transmit.

Conditions for Setting the DTC
^ The vehicle is driving for about 35 minutes at speeds over 32 km/h (20 mph) and the TPM sensor has not transmitted tire pressure information.
^ Any given sensor stops transmitting.

Action Taken When the DTC Sets
^ A DTC is stored in memory
^ The DIC displays the SERVICE TIRE MONITOR warning message
^ The DIC will display 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 50 consecutive malfunction free ignition cycles.
^ Using a scan tool

Diagnostic Aids
^ If the vehicle is stationary for more than 20 minutes the TPM sensors will go into power down mode and the DIC will display the tire pressures as dashes. Always test drive the vehicle over 32 km/h (20 mph) to insure the sensors are in power up mode before viewing tire pressures on the DIC.
^ If there is an open in the class 2 serial data circuit to the receiver, the DIC will display dashes for all tire pressures and the SERVICE TIRE MONITOR warning message.
^ Clear the TPM DTCs before road testing the vehicle whenever a TPM sensor is replaced in order to avoid reading the original DTC stored in the memory.
^ Take tire pressure measurements when the tires are cold in order to obtain the lowest readings.
^ Occasionally TPM sensor transmission will not be received by the RCDLR due to vehicle level radio frequency interference.

Test Description
The numbers below refer to the step numbers on the diagnostic table.
4. Tests whether the condition is module, system, or condition related.
7. Tests whether the condition has been corrected or identified as specified in supporting text.