The Tire Pressure Monitoring System (TPMS) in your 2007 Infiniti G35x plays a crucial role in ensuring safe driving conditions. When the TPMS warning light illuminates, it indicates a potential issue that requires attention. Often, this is accompanied by a diagnostic trouble code (DTC), such as C1105, which points to a problem within the wheel sensor system. This guide outlines the diagnostic and troubleshooting procedures for addressing the C1105 DTC in a 2007 Infiniti G35x, focusing on OBD2 diagnostics and potential TPMS issues. Understanding this code and the proper diagnostic steps can help you pinpoint the root cause and resolve the problem effectively.
Understanding the C1105 DTC in a 2007 Infiniti G35x
The C1105 DTC signifies a fault within the wheel sensor system. This system relies on sensors located in each wheel to monitor tire pressure and transmit data to the vehicle’s onboard computer. When a sensor malfunctions, transmits incorrect data, or experiences a communication error, the C1105 code may be triggered.
Diagnosing the C1105 Trouble Code
Addressing the C1105 DTC requires a systematic approach using an OBD2 scanner and a multimeter. Here’s a step-by-step guide to help you diagnose the issue:
1. Initial OBD2 Scan
Begin by connecting an OBD2 scanner to your vehicle’s diagnostic port. Retrieve any stored DTCs. If the C1105 code is present, proceed with the following steps.
2. Tire Inspection
Check the tire pressure of all four tires using a reliable gauge. Ensure the pressure matches the recommended specifications outlined in your vehicle’s owner’s manual. Inspect the tires for signs of uneven wear, damage, or improper size. Address any tire-related issues before proceeding.
3. Connector and Wiring Inspection
With the ignition switched off, disconnect the VDC/TCS/ABS control unit connector and the wheel sensor connector associated with the malfunctioning sensor (identified through the initial OBD2 scan). Examine the terminals for any signs of damage, corrosion, or deformation. Look for loose connections or poor contact. Reconnect the connectors securely. Also, inspect the wheel sensor wiring harness for any cuts, abrasions, or damage caused by interference with other components.
4. Sensor Rotor Inspection
Carefully examine the sensor rotor teeth for any damage, debris, or missing teeth. Inspect the surface of the rubber for cracks or damage. Replace the sensor rotor if any issues are found.
5. Wheel Sensor Harness Continuity Test
With the ignition off and the appropriate connectors disconnected, use a multimeter to check the continuity of the wheel sensor harness. Refer to the wiring diagram for your specific vehicle to identify the correct terminals.
- Power supply circuit: Verify continuity.
- Signal circuit: Verify continuity.
- Ground circuit: Ensure there is no continuity.
Repair or replace any faulty wiring or connectors.
6. Wheel Sensor Replacement and Verification
If all previous steps have not resolved the issue, the wheel sensor itself is likely faulty. Replace the suspected sensor with a new one and reconnect all connectors. Drive the vehicle at a speed above 19 mph (30 km/h) for at least one minute. Then, perform another OBD2 scan to check for the C1105 code. If the code persists, further diagnosis of the VDC/TCS/ABS control unit might be necessary.
Conclusion
Resolving the C1105 DTC in your 2007 Infiniti G35x involves a systematic process of inspection and testing. By following these steps, you can identify the root cause, whether it’s a faulty sensor, wiring issue, or a problem with the sensor rotor. Remember to consult your vehicle’s service manual for specific torque specifications and wiring diagrams. Addressing this issue promptly ensures the proper functioning of your TPMS, contributing to safe and reliable driving.
