what causes electric power steering failure in Toyota Corolla E170 (2013-2019)?

Toyota Corolla E170 (2013-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

522 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn how to diagnose and fix electric power steering failure in Toyota Corolla E170 (2013-2019). Step-by-step guide with symptoms and repair instructions.

Affected Component

Steering

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect battery before working on electrical systems.
•Allow the vehicle to cool down before accessing components if it has been recently driven.

Symptoms

•Steering wheel becomes heavy or difficult to turn
•Warning light illuminated on the dashboard
•No power assist when steering at low speeds
•Unusual noises when turning the steering wheel
•Intermittent power steering assistance

Diagnostic Steps

1
Check for any Diagnostic Trouble Codes (DTCs) using an OBD-II scanner.
2
Inspect the EPS control unit for any visible damage or disconnections.
3
Test the battery voltage and charging system to ensure proper power supply.
4
Examine the EPS motor for signs of overheating or wear.
5
Inspect wiring and connectors for corrosion or loose connections.
6
Check the steering column for any physical obstructions or damage.

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

•OBD-II scanner
•Socket set
•Multimeter
•Torque wrench
•Electrical contact cleaner

Parts Required

•EPS motor (if replacement is necessary)
•Wiring harness (if damaged)

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Diagnostic Steps

1
Check for any Diagnostic Trouble Codes (DTCs) using an OBD-II scanner.
2
Inspect the EPS control unit for any visible damage or disconnections.
3
Test the battery voltage and charging system to ensure proper power supply.
4
Examine the EPS motor for signs of overheating or wear.
5
Inspect wiring and connectors for corrosion or loose connections.
6
Check the steering column for any physical obstructions or damage.

Solution

1. Preparation

Gather all necessary tools and parts.
Disconnect the negative battery terminal to prevent electrical shock.

2. Inspect and Test EPS Control Unit

Sub-steps:
- Remove the dashboard cover to access the EPS control unit.
- Reconnect the battery temporarily and check for DTCs again.
- If codes are present, document them for further troubleshooting.
Tools Required: OBD-II scanner, socket set.

3. Check Electrical Connections

Sub-steps:
- Inspect the EPS wiring harness for signs of wear, corrosion, or damage.
- Clean any corroded connectors with electrical contact cleaner.
- Tighten any loose connections and ensure all connectors are seated properly.
Tools Required: Multimeter, electrical contact cleaner.

4. Replace EPS Motor (if necessary)

Sub-steps:
- Remove the steering column cover to access the EPS motor.
- Disconnect the wiring harness from the EPS motor.
- Unbolt the EPS motor from the steering column and remove it.
- Install the new EPS motor and secure it with bolts to the steering column, ensuring proper alignment.
- Reconnect the wiring harness to the new EPS motor.
Tools Required: Socket set, torque wrench.
Torque Values: Refer to the service manual for specific torque values for the motor bolts.

5. Final Assembly

Sub-steps:
- Reinstall the steering column cover.
- Reconnect the negative battery terminal.
- Clear any DTCs from the system using the OBD-II scanner.
Safety Warning: Ensure the vehicle is on a flat surface before reassembling and testing.