Without RPO UH3

DTC C0750, C0755, C0760, or C0765 (without RPO UH3)

(RPO UH3 - Indicator Low Tire Pressure, Var 2)

Diagnostic Instructions
• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Diagnostic System Check - Vehicle
• Review Strategy Based Diagnosis for an overview of the diagnostic approach. Strategy Based Diagnosis
• Diagnostic Procedure Instructions provides an overview of each diagnostic category. Diagnostic Procedure 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 40 kph (25 mph) or greater, the RCDLR waits for the sensors to go into Rolling mode. If one or more sensors do not go into Rolling mode, or do not transmit at all, the RCDLR will set DTC C0750, C0755, C0760, or C0765 respectively.

Conditions for Running the DTC
Vehicle speed is 25 mph or greater for 2 minutes.

Conditions for Setting the DTC
A sensor does not transmit for 18 minutes.

Action Taken When the DTC Sets
• The driver information center displays the suspect tire pressure as dashes.
• The DIC displays the service tire monitor type message.

Conditions for Clearing the DTC
• A current DTC will clear when the malfunction is no longer present and 1 ignition cycle occurs.
• 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 valve 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 Indicator Sensor Learn. Programming and Relearning
• Occasionally sensor transmissions are not received by the RCDLR due to vehicle level RF interference.

Reference Information

Description and Operation
Tire Pressure Monitor Description and Operation Description and Operation

Electrical Information Reference
• Circuit Testing Circuit Testing
• Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs Wiring Repairs
• Connector Repairs Connector Repairs

Scan Tool Reference
• Scan Tool Data Definitions Scan Tool Data Definitions
• Scan Tool Data List Scan Tool Data List

Special Tools Required
EL-46079/J-46079 Tire Pressure Monitor Diagnostic Tool

Circuit/System Testing

1. Using the EL-46079/J-46079 , activate each tire pressure sensor and record each sensors transmission data and physical location. Verify EL-46079/J-46079 displays the 8-digit ID number, accurate tire pressure within 27.6 kPa (4 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 Indicator 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 are within 27.6 kPa (4 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 to Rolling.
--> 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 Replacement
• Tire Pressure Indicator Sensor Learn Programming and Relearning
• RCDLR replacement Service and Repair
• RCDLR setup, and programming Testing and Inspection