what does it mean if my Toyota RAV4 Fourth Generation (2013-2018) has a C1231 code

Solution

1. Preparation

• Gather necessary tools: OBD-II scanner, multimeter, socket set, and torque wrench.
• Ensure the vehicle is parked on a level surface and the engine is off. Disconnect the battery to ensure safety.

2. Inspect Wheel Speed Sensor

• Remove the wheel corresponding to the faulty sensor.
• Locate the wheel speed sensor and disconnect the electrical connector.
• Visually inspect the sensor for dirt, debris, or physical damage.
• Use a multimeter to measure the resistance of the sensor. Replace if the resistance is outside the specified range (typically 1,000-2,000 ohms).

3. Repair or Replace Wiring/Connector

• If any wiring is damaged, splice in new wire or replace the entire harness as needed.
• Clean any corrosion from connectors using electrical contact cleaner and reconnect securely.

4. Replace Wheel Speed Sensor (if necessary)

• If the wheel speed sensor is faulty, remove the sensor by unscrewing it from its housing.
• Install the new sensor, ensuring it is seated correctly.
• Torque the sensor to the manufacturer’s specification (usually around 7-9 ft-lbs).

5. Reconnect and Test

• Reconnect the electrical connector and reinstall the wheel.
• Reconnect the battery and start the vehicle.
• Clear the trouble codes using an OBD-II scanner and perform a test drive to ensure the ABS light does not reappear.