my Toyota Corolla E170 (2013-2019) traction control light is on, what's the issue

Solution

1. Preparation

• Gather necessary tools and parts required for the repair.
• Disconnect the battery to avoid electrical short circuits during repair.
• Ensure the vehicle is on a flat surface and secure it with wheel chocks.

2. Inspect and Clean Wheel Speed Sensors

• Tools Required: Socket set, cleaning brush, and isopropyl alcohol.
• Remove the wheel on the affected side using the socket set.
• Locate the wheel speed sensor and inspect for any dirt or damage.
• Clean the sensor using a cleaning brush and isopropyl alcohol.
• Reinstall the wheel and torque the lug nuts to the manufacturer's specifications.

3. Check and Refill Brake Fluid

• Tools Required: Brake fluid and a funnel.
• Locate the brake fluid reservoir under the hood.
• Check the fluid level; if low, add the recommended brake fluid type (DOT 3 or DOT 4).
• Ensure the reservoir cap is securely closed after refilling.

4. Test Traction Control Switch

• Tools Required: Multimeter.
• Locate the traction control switch in the vehicle interior.
• Disconnect the switch connector and use a multimeter to check for continuity when the switch is pressed.
• Replace the switch if it fails the continuity test.

5. Reconnect Battery and Clear Codes

• Reconnect the battery terminals and ensure they are securely fastened.
• Use the OBD-II scanner to clear any error codes related to the traction control system.
• Start the vehicle and check if the traction control light remains off.