how to diagnose C1201 code in Toyota Camry Eighth Generation (2018-present)?

Solution

1. Preparation

• Tools Required: OBD-II scanner, multimeter, socket set, torque wrench, brake cleaner.
• Disconnect the negative battery terminal to ensure safety while working on electrical components.

2. Inspect and Replace Wheel Speed Sensors (if necessary)

• Sub-steps:
  1. Raise the vehicle and secure it on jack stands.
  2. Remove the wheel to access the wheel speed sensor.
  3. Disconnect the electrical connector from the sensor.
  4. Remove the mounting bolts using a socket set and pull the sensor from its housing.
  5. Clean the sensor area with brake cleaner before installing a new sensor.
  6. Install the new sensor and torque the bolts to manufacturer specifications (typically around 7-10 ft-lbs).
  7. Reconnect the electrical connector and replace the wheel.

3. Brake Fluid and ABS Module Check

• Sub-steps:
  1. Check the brake fluid level; if low, top it off with the recommended brake fluid (DOT 3 or DOT 4).
  2. If the ABS module is suspected faulty, remove it by unscrewing the mounting bolts.
  3. Disconnect all electrical connectors and brake lines (be cautious of brake fluid spillage).
  4. Replace with a new ABS module, ensuring proper torque specifications for mounting bolts.
  5. Reconnect all electrical connectors and brake lines securely.

4. Clear Error Codes

• After repairs, use the OBD-II scanner to clear the C1201 code from the system.
• Reconnect the negative battery terminal.