how to diagnose electric power steering issues in Toyota Corolla E170 (2013-2019)

Solution

1. Preparation

• Tools Required: OBD-II scanner, multimeter, socket set, torque wrench, power steering fluid.
• Ensure the vehicle is parked on a flat surface, and the ignition is turned off.
• Disconnect the battery to prevent electrical shorts during repair.

2. Address Power Steering Fluid Issues

• Sub-steps:
  • Open the power steering reservoir cap and check fluid level.
  • If low, add the manufacturer-recommended power steering fluid.
  • If contaminated, proceed to drain and replace the fluid:
    • Disconnect the return line from the reservoir.
    • Drain the old fluid into a suitable container.
    • Reconnect the line and refill with new fluid.

3. Repair Electrical Connections

• Sub-steps:
  • Inspect and clean the connectors leading to the electric power steering motor.
  • Repair or replace any damaged wiring or connectors as necessary.
  • Ensure all connections are secure.

4. Replace Steering Angle Sensor (if faulty)

• Sub-steps:
  • Remove the steering wheel (ensure the battery is disconnected).
  • Unclip the airbag and steering wheel harness.
  • Remove the steering column covers to access the steering angle sensor.
  • Disconnect the sensor and replace it with a new one.
  • Reassemble the steering wheel and reconnect the battery.

5. Recalibrate the System

• Sub-steps:
  • Turn on the ignition without starting the engine.
  • Using a scan tool, perform a steering angle sensor calibration.
  • Follow the procedure according to the scan tool instructions.