what does the C1201 code mean for my Toyota Corolla E210 (2019-2024)?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative terminal of the battery to prevent electrical shorts.
• Ensure the vehicle is on a level surface and securely lifted.

2. Inspect and Replace Speed Sensors

• Tools Required: OBD-II scanner, multimeter, socket set, torque wrench.
• Check the physical condition of the speed sensors:
  • Locate the wheel speed sensors at each wheel hub.
  • Remove any debris or dirt around the sensors.
• If a speed sensor is found to be faulty:
  • Disconnect the wiring harness from the sensor.
  • Remove the sensor using the appropriate socket or wrench.
  • Install a new speed sensor, ensuring it is seated properly.
  • Reconnect the wiring harness and secure it.

3. Check and Repair Wiring

• Inspect the wiring harness leading to the speed sensors:
  • Look for any frayed wires or corrosion at the connectors.
  • Use a multimeter to check continuity and resistance in the wiring.
• If any issues are found, repair the wiring using solder and heat-shrink tubing or replace the damaged section of the harness.

4. Reset the ABS Control Module

• After repairs, reconnect the battery terminal.
• Use the OBD-II scanner to clear the C1201 code from the ABS control module.
• Ensure all systems are functioning correctly by performing a brief test drive.