C0750
DTC C0750, C0755, C0760, or C0765Step 1 - 8:
Circuit Description
The Tire Pressure Monitor (TPM) system has 4 Radio Frequency (RF) transmitting pressure sensors in each wheel/tire assembly. As vehicle speed increases above 32 km/h (20 mph) the sensor's internal roll switch closes which puts the sensors into drive mod e. The sensors begin to transmit their RF signal once every 60 seconds to the Remote Control Door Lock Receiver (RCDLR). The information within this RF signal is translated by the RCDLR into tire location and tire pressure. The RCDLR waits for the first sensor to transmit it's 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.
Condition for running the DTC
Vehicle speed is above 32 km/h (20 mph) for 35 minutes.
Conditions for Setting the DTC
Any given sensor stops transmitting for 15 minutes.
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 pressures 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 15 minutes after being driven the sensors will go into stationary mode. Always test drive the vehicle over 32 km/h (20 mph) to insure the sensors are in drive 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.
^ Occasionally sensor transmission will not be received by the RCDLR due to vehicle level RF interference.
^ Loss of, or low vehicle battery voltage, or disconnecting the RCDLR will cause the sensors id codes to be erased from the RCDLR's memory and set all 4 of the sensor DTCs. If this condition is suspected, refer to Tire Pressure Monitoring Sensor Programming.
^ Occasionally sensors can become mislocated due to previous tire rotations where the sensor programming procedure was not performed. Always program the sensors first then test drive to ensure the DTC set is for that actual comer of the vehicle.
Test Description
The numbers refer to the step numbers on the diagnostic table.
2. Tests if the malfunction is due to the sensor's internal battery being low.
5. Tests if the sensors internal roll switch is functioning properly.
6. Tests if the malfunction was corrected by sensor replacement, or if the malfunction still exists in the RCDLR.