Diagnosing and resolving car issues can be daunting, especially when warning lights illuminate your dashboard. For 2007 Infiniti G35x owners, encountering the C1105 error code can be a common yet perplexing problem. This code, often linked to the wheel sensor system, can impact your vehicle’s safety and performance features like ABS, VDC, and TCS. Utilizing your vehicle’s OBD2 system and understanding the role of TPMS (Tire Pressure Monitoring System) are crucial steps in tackling this issue effectively. This guide provides a step-by-step approach to diagnosing the C1105 error on your 2007 Infiniti G35x, ensuring you can address it with confidence.
Step 1: Initial OBD2 Self-Diagnostic Check for Error Code C1105
The first step in addressing the C1105 error is to confirm its presence and identify potentially related issues using your Infiniti’s self-diagnostic system accessible through the OBD2 port. Using an OBD2 scanner, check for the C1105 code. This initial scan is critical in pinpointing the malfunctioning wheel sensor location, saving time and effort in the diagnostic process.
Is C1105 displayed in the self-diagnosis?
- YES: Proceed to Step 2.
- NO: The C1105 error may be intermittent or not currently present. Further investigation beyond the scope of this guide may be required, or the error was previously resolved and not cleared from the system.
Step 2: Tire Inspection – Pressure, Wear, and Size
Before diving deeper into sensor diagnostics, a simple yet crucial step is to inspect your tires. Incorrect tire pressure, uneven wear, or mismatched tire sizes can sometimes trigger wheel sensor related errors. Ensure all tires are inflated to the recommended pressure, check for uneven wear patterns, and verify that all tires are the correct and matching size for your 2007 Infiniti G35x.
Are tire pressure, wear, and size within specifications?
- YES: Proceed to Step 3.
- NO: Adjust tire pressure to the recommended levels or replace tires as necessary. After adjustments, re-check if the C1105 error persists.
Step 3: Connector Integrity Check – VDC/TCS/ABS Control Unit and Wheel Sensor
Electrical connections are vital for the wheel sensor system’s proper function. Turn off the ignition and disconnect the VDC/TCS/ABS control unit connector and the connector of the wheel sensor identified as malfunctioning in the initial OBD2 scan. Inspect the terminals for any signs of deformation or corrosion and ensure the connectors are making good contact. Reconnect the connectors securely. Also, visually inspect the wheel sensor cables for any cuts or damage due to interference with other vehicle parts. After reconnecting, drive your Infiniti G35x at a speed of 30 km/h (19 MPH) or above for at least one minute to see if the ABS warning lamp turns off.
Does the ABS warning lamp turn off after checking connectors and driving?
- YES: The issue might have been due to a loose connection. Inspection is complete.
- NO: Proceed to Step 4.
Step 4: Sensor Rotor Examination – Teeth and Rubber Surface
The sensor rotor, also known as the ABS exciter ring, is a critical component that works in conjunction with the wheel speed sensor. Inspect the sensor rotor teeth for any damage, debris, or corrosion. Also, check the surface of the rubber for any wear or damage. Damage to the sensor rotor can lead to inaccurate wheel speed readings and trigger the C1105 error.
Is the sensor rotor OK or NG (No Good)?
- OK: Proceed to Step 5.
- NG: Replace the sensor rotor.
Step 5: Wheel Sensor Harness Continuity Test
The wheel sensor harness carries signals between the sensor and the vehicle’s control unit. To check its integrity, turn off the ignition, disconnect the malfunctioning wheel sensor connector and the VDC/TCS/ABS control unit connector. Use a multimeter to check the continuity between the terminals as illustrated below. Perform these checks while steering wheel is turned right and left and when the sensor harness inside the wheel well is moved, to identify any intermittent breaks.
Refer to the wiring diagram to ensure you are testing the correct circuits.
Continuity Test Results:
- Power supply circuit: Continuity should exist.
- Signal circuit: Continuity should exist.
- Ground circuit: Continuity should NOT exist.
Is the harness OK or NG?
- OK: Proceed to Step 6.
- NG: Repair or replace the harness and connector with the malfunction.
Step 6: Wheel Sensor Replacement and Final Diagnostic
If all preceding steps haven’t resolved the C1105 error, the wheel sensor itself is likely faulty. Replace the wheel sensor that was identified as malfunctioning by the OBD2 self-diagnosis. Reconnect all connectors, drive the vehicle above 30 km/h (19 MPH) for approximately one minute, and then perform another self-diagnosis using your OBD2 scanner.
Is C1105 still displayed after wheel sensor replacement and self-diagnosis?
- OK: The wheel sensor was indeed the issue. The repair is complete.
- NG: In rare cases, if the error persists after sensor replacement, the VDC/TCS/ABS control unit itself might be faulty. Replacement of this unit may be necessary. Perform self-diagnosis again to ensure that the result shows “NO DTC IS DETECTED,” indicating successful repair. Further testing beyond these steps may be required in complex scenarios.
By following these steps, you can systematically diagnose and address the C1105 error code on your 2007 Infiniti G35x, ensuring the optimal performance and safety of your vehicle’s critical systems. Remember to always prioritize safety and consult a professional mechanic if you are uncomfortable performing these diagnostic steps yourself.
