Diagnostic Instructions
DTC Descriptors
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
Circuit/System Description
The tire pressure monitor (TPM) system has a radio frequency (RF) transmitting pressure sensor in each wheel/tire assembly. As vehicle speed increases, centrifugal force closes the sensors internal roll switch, which puts the sensor into drive mode. The
remote control door lock receiver (RCDLR) receives and translates the data contained in the tire pressure sensor RF transmissions into sensor presence, sensor mode, and tire pressure. Once vehicle speed is 20 mph or greater, the RCDLR waits for the first
sensor to go into drive mode, then checks if all sensors have gone into drive mode. If one or more sensors do not go into drive mode, or do not transmit at all, the RCDLR will set DTC C0750, C0755, C0760, or C0765.
Conditions for Running the DTC
Vehicle speed is 25 mph or greater for 2 minutes.
Conditions for Setting the DTC
| • | Any given sensor does not go into drive mode. |
| • | Any given sensor does not transmit for 5 minutes. |
Action Taken When the DTC Sets
| • | The driver information center (DIC) displays the suspect tire pressure as dashes. |
| • | 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. |
| • | The electronic brake control module (EBCM) automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles. |
Diagnostic Aids
| • | Some aftermarket wheel valve stem holes are located further from the wheel rim than original equipment wheels. When using the TPM special tool to activate a sensor, ensure the tools 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. Refer to
Tire Pressure Sensor Learn
. |
| • | Occasionally sensor transmissions are not received by the RCDLR due to vehicle level RF interference. |
Reference Information
Schematic Reference
Tire Pressure Monitoring System Schematics
Description and Operation
Tire Pressure Monitor Description and Operation
Electrical Information Reference
Scan Tool Reference
Circuit/System Verification
Test drive the vehicle at a speed of 25 mph or greater for 2 minutes. No tire pressure monitor DTCs should set.
Circuit/System Testing
Important: Tire pressure sensors should transmit valid data with good signal strength in response to low frequency activation from the TPM special tool. It is important to observe the signal strength graph on the TPM special tool
display screen after the activate button has been pressed and released. Any more than 1/4 graph displayed can be considered good signal strength.
- Using the special tool, activate each tire pressure sensor and record each sensors transmission data and physical location. Verify tool displays 8-digit ID number, accurate tire pressure +/- 2 psi, Learn Mode, and good signal strength.
| ⇒ | If any of the parameters listed above are not displayed, replace the suspect tire pressure sensor. |
- With the scan tool, verify tire pressure sensors ID and locations displayed on the scan tool match the IDs and locations recorded from the special tool.
| ⇒ | If the IDs and locations do not match, perform Sensor Learn procedure. |
- Enable the TPM learn mode. Use the TPM special tool in simulate mode to learn 4 simulated sensor transmissions into the RCDLR. Verify all 4 sensor locations, IDs, and tire pressures (+/- 2 psi) as they are displayed on the TPM special
tool match what the scan tool displays.
| ⇒ | If the scan tool does not match, replace the RCDLR. |
- Test drive the vehicle above 40 km/h (25 mph) for greater than 10 seconds. With the scan tool, observe the suspect Pressure Sensor Mode data parameter. Verify sensor mode changes from Wake to Drive.
| ⇒ | If the suspect Pressure Sensor Mode does not change, replace the suspect tire pressure sensor. |
- If no faults are found, go to Diagnostic Aids.
Repair Instructions
Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
