Circuit Description
The tire pressure monitor (TPM) system has 4 radio frequency (RF) transmitting pressure sensors inside each wheel/tire assembly. As vehicle speed increases to at least 32 km/h (20 mph) the sensor's internal roll switch closes which puts the sensors into drive mode. The sensors begin to transmit once every 60 seconds to the passenger door module (PDM) or remote control door lock receiver (RCDLR) if equipped. The data within the sensors RF transmission is translated by the PDM or RCDLR into sensor presence, sensor mode, and tire pressure. If a sensor did not go into drive mode, or is not transmitting at all, the PDM or RCDLR will set the appropriate DTC.
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 40 km/h (25 mph), or greater for 2 minutes.
Conditions for Setting the DTC
Any given sensor stops transmitting for 5 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. |
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
| • | 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. Refer to Tire Pressure Sensor Learn . |
| • | 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.
-
This step tests if the sensors internal battery level is low.
-
This step tests if the malfunction was system, or vehicle condition related.
-
This step tests if the sensors internal roll switch is functioning properly.
-
This step tests if the malfunction was corrected by sensor replacement of if the malfunction still exists in the PDM or RCDLR.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Tire Pressure Monitoring System Schematics | |||
1 | Did you perform the Diagnostic System Check - Tire Pressure Monitoring? | Go to Step 2 | |
Does the scan tool indicate that the suspect Pressure Sensor Mode is Low Bat? | Go to Step 6 | Go to Step 3 | |
Since some occurrences of this DTC are caused by certain vehicle conditions. Review the tire pressure monitor (TPM) system with the customer to verify the conditions under which the DTC set. Did vehicle conditions cause this DTC to set? | Go to Diagnostic Aids | Go to Step 4 | |
4 | Learn the tire pressure sensors. Refer to Tire Pressure Sensor Learn . Did a horn chirp sound when learning the suspect sensor? | Go to Step 5 | Go to Step 6 |
Does the Suspect Pressure Sensor Mode data parameter change from Wake to Drive above 32 km/h (20 mph)? | System OK | Go to Step 6 | |
Replace the suspect tire pressure sensor. Refer to Tire Pressure Indicator Sensor Replacement . Did a horn chirp sound when learning the suspect sensor? | Go to Step 8 | Go to Step 7 | |
7 | Replace the passenger door module (PDM) or remote control door lock receiver (RCDLR) module/switch assembly. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 8 | -- |
8 |
Does the DTC reset? | Go to Step 2 | System OK |
