what does C1231 code mean for my Toyota Corolla E210 (2019-2024)

Learn how to diagnose and fix C1231 ABS malfunction in Toyota Corolla E210. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle battery to ensure safety.
• Allow the vehicle to cool down if it has been recently driven.

2. Inspect and Clean Wheel Speed Sensors

• Tools Required: Socket set, screwdriver, cleaning brush, and electrical contact cleaner.
• Sub-steps:
  1. Raise the vehicle and secure it on jack stands.
  2. Remove the wheel corresponding to the faulty sensor.
  3. Locate the wheel speed sensor mounted on the hub assembly.
  4. Disconnect the sensor connector.
  5. Remove the sensor from its mounting position using the socket set.
  6. Clean the sensor tip with a cleaning brush and electrical contact cleaner to remove any debris.
  7. Reinstall the sensor and reconnect the electrical connector.

3. Check Wiring and Connectors

• Tools Required: Multimeter.
• Sub-steps:
  1. Inspect the wiring harness leading to the ABS module for any visible damage or fraying.
  2. Use a multimeter to check for continuity between the sensor connectors and the ABS module.
  3. Repair or replace any damaged wires or connectors as necessary.

4. Replace Wheel Speed Sensor (if necessary)

• Tools Required: Socket set, torque wrench.
• Parts Required: New wheel speed sensor (if faulty).
• Sub-steps:
  1. If the sensor is found to be faulty, remove it as described in the previous step.
  2. Install the new wheel speed sensor into the mounting position.
  3. Torque the sensor to the manufacturer’s specifications (typically around 10-15 ft-lbs).
  4. Reconnect the electrical connector.

5. Reconnect Battery and Test

• Reconnect the vehicle battery.
• Start the vehicle and check for any warning lights on the dashboard.
• Take the vehicle for a test drive to ensure proper ABS function.