my Toyota RAV4 has a check engine light with code C1231 what does it mean

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle battery to ensure safety while working on electrical components.

2. Inspect Wheel Speed Sensors

• Tools Required: Multimeter, socket set.
• Locate each ABS wheel speed sensor at the wheel hub.
• Disconnect the wiring harness from each sensor.
• Use a multimeter to check the resistance of each sensor (should typically be between 1,000-2,000 ohms).
• If a sensor is faulty, replace it.

3. Check ABS Module and Wiring

• Tools Required: Torque wrench, socket set.
• Locate the ABS module under the hood or within the vehicle.
• Inspect the wiring harness for any signs of wear, fraying, or corrosion.
• Tighten any loose connections and replace corroded connectors.
• If the ABS module is faulty, it will need to be replaced.

4. Brake Fluid Check

• Tools Required: Brake fluid tester (optional).
• Remove the master cylinder cap and check the brake fluid level.
• If low, refill with the recommended brake fluid type as specified in the owner's manual.
• Inspect for any leaks in brake lines and repair as necessary.

5. Reconnect Battery and Clear Codes

• Reconnect the vehicle's battery.
• Use the OBD-II scanner to clear the C1231 code.
• Start the vehicle and check that the warning lights are off.