what does it mean if my Toyota Highlander shows C1231 code

Solution

1. Preparation

• Tools Required: OBD-II scanner, multimeter, socket set, wire brush, and dielectric grease.
• Disconnect the vehicle battery to ensure safety while working on the electrical system.

2. Inspect and Clean Wheel Speed Sensors

• Locate the wheel speed sensors at each wheel hub.
• Remove any dirt or debris around the sensors using a wire brush.
• Disconnect the electrical connector from the wheel speed sensor.
• Inspect the connector for corrosion and clean it with dielectric grease if necessary.

3. Test Wheel Speed Sensors

• Use a multimeter to measure the resistance of each wheel speed sensor.
  • Specification: Typically between 1,000 and 2,500 ohms (check manufacturer specifications for exact values).
• If any sensor is out of specification, replace it.

4. Check ABS Control Module

• Remove the ABS control module from its mounting.
• Inspect for any physical damage, burnt connectors, or corrosion.
• If damage is present, the control module may need replacement.

5. Reassemble and Reconnect

• Reconnect all electrical connectors securely.
• Reconnect the vehicle battery.
• Clear the fault codes using the OBD-II scanner.