what does the C1231 code mean for my Toyota Highlander Fourth Generation (2020-present)?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect Wheel Speed Sensors

• Tools Required: Socket set, multimeter
• Remove the wheel and tire assembly to access the wheel speed sensor.
• Disconnect the sensor connector and inspect the wiring for any signs of wear or damage.
• Use a multimeter to check the sensor resistance; replace if out of specification.

3. Clean or Replace Wheel Speed Sensors

• If the sensor is dirty, clean it with a soft cloth and an appropriate cleaning solution.
• If damaged, install a new wheel speed sensor:
  1. Position the new sensor in place.
  2. Secure with the appropriate torque (refer to manufacturer specifications).
  3. Reconnect the sensor connector.

4. Inspect ABS Module and Pump

• Tools Required: Multimeter
• Locate the ABS module and pump assembly. Check for any visible damage or leaks.
• Test the ABS module using a multimeter to ensure it is receiving proper voltage.
• If the module is faulty, replace it following manufacturer guidelines.

5. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the C1231 code from the vehicle’s memory.