what does a C1231 code mean for my Toyota RAV4 XA50 (2019-2024)

Solution

1. Preparation

• Gather tools: OBD-II scanner, multimeter, socket set, torque wrench, and safety gloves.
• Disconnect the negative battery terminal to avoid any electrical shorts.

2. Inspect Wiring and Connectors

• Remove the rear wheel to gain access to the wheel speed sensor and wiring.
• Visually inspect the wiring harness and connectors for any signs of wear, fraying, or corrosion.
• If damage is found, repair or replace the affected wiring or connectors.

3. Test the Wheel Speed Sensor

• Using a multimeter, set it to measure resistance.
• Disconnect the wheel speed sensor connector and measure the resistance across the sensor terminals.
• Compare the reading with the manufacturer's specifications (typically between 1,000 to 2,000 ohms). If the resistance is out of range, replace the sensor.

4. Replace Wheel Speed Sensor (if necessary)

• If the sensor is faulty, remove the old sensor by unscrewing it from the hub assembly.
• Install the new wheel speed sensor, ensuring it is securely fastened.
• Reconnect the wiring harness to the new sensor.

5. Reassemble and Test

• Reinstall the rear wheel and torque the lug nuts to the manufacturer's specifications.
• Reconnect the negative battery terminal.
• Clear the error codes using the OBD-II scanner and perform a test drive to ensure the ABS and traction control systems are functioning correctly.