why does my Toyota Corolla E170 (2013-2019) lose steering assist intermittently?

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is turned off.
• Disconnect the battery to prevent any electrical shorts during repair.

2. Power Steering Fluid Inspection

• Remove the power steering fluid reservoir cap.
• Check the fluid level; add the recommended type of power steering fluid if low (usually ATF or specific power steering fluid).
• If fluid is discolored or has debris, consider flushing and replacing the fluid.

3. Steering Angle Sensor Adjustment

• Locate the steering angle sensor, typically found on the steering column.
• Disconnect the electrical connector and inspect for signs of wear or corrosion.
• If necessary, recalibrate or replace the sensor according to manufacturer specifications.

4. Electrical Connections Check

• Inspect all wiring and connectors related to the power steering system.
• Repair or replace any damaged wires or connectors.
• Ensure all connections are secure and free from corrosion.

5. Power Steering Pump Inspection

• Start the engine and listen for unusual noises from the power steering pump.
• If noise is present, detach the pump and inspect for internal wear or damage.
• Replace the pump if necessary, following manufacturer guidelines for torque specifications and fluid refilling.

6. Battery and Charging System Test

• Use a multimeter to check the battery voltage; it should be around 12.6 volts when at rest.
• Check the alternator output while the engine is running; it should be between 13.5 to 14.5 volts.
• If the battery or alternator is faulty, replace as needed.