C0765

DTC C0765

Step 1 - 8:

Circuit Description
The Tire Pressure Monitor (TPM) 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 sensor into drive mode. The sensors begin to transmit once every 60 seconds to the Remote Control Door Lock Receiver (RCDLR). The data 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 data 8 times. The RCDLR then checks weather all sensors have transmitted there data. If 1 or more sensors do not transmit their data, the RCDLR will set the appropriate DTC for the sensor that did not transmit.

Conditions for Running the DTC
Vehicle speed is above 32 km/h (20 mph) for 35 minutes

Conditions for Setting the DTC
If 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 TPM SYSTEM 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 malfunction free ignition cycles.
^ Use 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 above 32 km/h (20 mph) to ensure the sensors are in drive mode before viewing tire pressures on the DIC.
^ If there is an open in the serial data circuit to the receiver, the DIC will display dashes for all tire pressures and the SERVICE TPM SYSTEM message.
^ Loss of, or low system battery voltage will cause all of the sensor id codes to be erased from the RCDLR's memory and set all 4 sensor DTCs. If this condition is suspected, refer to Tire Pressure Monitoring Sensor Programming.
^ Occasionally sensor transmission will not be received by the RCDLR due to vehicle level RF interference.

Test Description
The numbers refer to the step numbers on the diagnostic table.
2. Tests if the malfunction is system, or vehicle condition related.
5. Tests if the sensor's 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.