C0765

DTC C0750, C0755, C0760, or C0765

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach. Initial Inspection and Diagnostic Overview
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.

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

* A sensor does not go into drive mode.
* A sensor does not transmit for 20 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 RCDLR 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.
* Aftermarket wheel value stem locations can cause a sensor to not function correctly.
* 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. Programming and Relearning
* Occasionally sensor transmissions are not received by the RCDLR due to vehicle level RF interference.

Special Tools Required

J-46079 Tire Pressure Monitor Diagnostic Tool

Circuit/System Testing

1. Using the J-46079, activate each tire pressure sensor and record each sensors transmission data and physical location. Verify J-46079 displays the 8-digit ID number, accurate tire pressure +/- 2 psi, Learn Mode, and at least a 1/4 graph signal strength displayed.
^ If any of the parameters listed above are not displayed, replace the suspect tire pressure sensor.

2. 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 the Tire Pressure Sensor Learn. Programming and Relearning

3. 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 (+/- 1 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.

4. 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.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests

* Tire Pressure Indicator Sensor Replacement
* Tire Pressure Sensor Learn
* Control Module References for RCDLR replacement, setup, and programming