How To Reset Power Steering Assist Fault

Experiencing a power steering assist fault can be frustrating and, more importantly, unsafe. While some issues require professional attention, there are a few troubleshooting steps you can take before heading to the mechanic. This article outlines practical ways to attempt a power steering assist reset, potentially saving you time and money. These methods are primarily applicable to modern vehicles equipped with electronically controlled power steering (EPS) systems.

Preliminary Checks

Before attempting a reset, perform these basic checks:

• Inspect the Power Steering Fluid (If Applicable): Some EPS systems still utilize hydraulic fluid. Check the reservoir level. If it's low, top it off with the recommended fluid. Look for leaks around the reservoir, hoses, and pump.
• Check the Battery: A weak battery can cause various electrical issues, including power steering malfunctions. Ensure your battery terminals are clean and securely connected. Consider having your battery tested at an auto parts store.
• Examine Fuses and Relays: Consult your vehicle's owner's manual to locate the power steering fuse and relay. Check if the fuse is blown or the relay is faulty. Replace them if necessary.

Reset Procedures

Method 1: The Ignition Cycle Reset

This is the simplest and often the first method to try. It involves cycling the ignition to attempt a system reboot.

1. Turn off the engine completely. Remove the key from the ignition.
2. Wait for at least 10-15 minutes. This allows the vehicle's computer system to fully shut down and reset.
3. Reinsert the key and turn the ignition to the "ON" position (without starting the engine). Observe the dashboard lights.
4. Start the engine and check if the power steering assist has returned. Gently turn the steering wheel to confirm functionality.

Important Note: This method is non-invasive and safe for most vehicles. If it doesn't work, proceed to the next method.

Method 2: The Steering Wheel Calibration Reset

This method attempts to recalibrate the steering angle sensor, which is crucial for EPS systems to function correctly. This process might vary slightly depending on the vehicle make and model, but the general principle remains the same.

1. Start the engine.
2. Turn the steering wheel completely to the left and hold it at the stop for 5-10 seconds.
3. Turn the steering wheel completely to the right and hold it at the stop for 5-10 seconds.
4. Return the steering wheel to the center position.
5. Turn off the engine and remove the key from the ignition.
6. Wait a few minutes.
7. Restart the engine and check if the power steering assist has returned.

Variation: Some vehicles require driving in a straight line for a short distance (e.g., 50-100 feet) after completing the steering wheel calibration. Consult your owner’s manual for specific instructions for your vehicle.

Method 3: Battery Disconnect Reset

This method forces a more complete reset of the vehicle's electronic systems by disconnecting the battery. Caution: Disconnecting the battery can reset other vehicle systems, such as the radio, security system, and engine control unit (ECU). You may need to re-enter security codes or perform other procedures after reconnecting the battery. Consult your owner’s manual for specific instructions and potential consequences for your vehicle.

1. Turn off the engine completely.
2. Locate the negative (-) battery terminal.
3. Using a wrench, carefully loosen the nut on the negative terminal clamp.
4. Remove the negative terminal clamp from the battery post.
5. Wait for at least 15-30 minutes. This allows the vehicle's electronic systems to completely discharge.
6. Reconnect the negative terminal clamp to the battery post and tighten the nut securely.
7. Start the engine and check if the power steering assist has returned.

Safety First: Wear safety glasses and gloves when working with the battery. Ensure the vehicle is parked on a level surface and the parking brake is engaged.

Method 4: OBD-II Scanner Reset

If you have access to an OBD-II scanner (or a code reader), you can use it to read and clear any Diagnostic Trouble Codes (DTCs) related to the power steering system. This is a more sophisticated method that can sometimes resolve persistent issues.

1. Connect the OBD-II scanner to the diagnostic port (usually located under the dashboard).
2. Turn the ignition to the "ON" position (without starting the engine).
3. Follow the scanner's instructions to read any stored DTCs.
4. If any codes related to the power steering system are present (e.g., C1511, C1513), write them down for future reference.
5. Use the scanner's function to clear the DTCs.
6. Turn off the ignition and disconnect the scanner.
7. Start the engine and check if the power steering assist has returned.

Understanding Codes: While clearing codes can sometimes resolve the issue, it's crucial to understand the meaning of the codes. If the same code reappears shortly after clearing it, it indicates a more serious underlying problem that requires professional diagnosis and repair.

When to Seek Professional Help

If you've tried all the reset methods and the power steering assist fault persists, it's time to consult a qualified mechanic. Common reasons for persistent power steering issues include:

• Faulty Steering Angle Sensor
• Defective Torque Sensor
• Problem with the EPS Motor or Control Module
• Wiring or Connector Issues

Ignoring a power steering fault can compromise your safety and potentially lead to more expensive repairs down the road. A professional mechanic has the tools and expertise to accurately diagnose and repair the underlying problem.

Practical Application in Daily Life/Work

Knowing these reset procedures can be incredibly useful in several situations:

• Roadside Emergencies: If you experience a sudden power steering failure while driving, attempting a quick reset (like the ignition cycle reset) might temporarily restore functionality, allowing you to safely reach a repair shop.
• Pre-Trip Inspections: If you notice intermittent power steering issues before a long trip, try these resets to see if they resolve the problem. Addressing the issue before embarking on a journey is always preferable.
• Fleet Management: For businesses managing a fleet of vehicles, these troubleshooting steps can help identify and resolve minor power steering issues quickly, reducing downtime and repair costs.
• Personal Vehicle Maintenance: Regularly checking your power steering fluid and knowing how to perform basic resets can help prevent minor issues from escalating into major problems, saving you money on costly repairs in the long run.

Checklist/Guideline

Use this checklist as a quick reference:

1. Preliminary Checks: Fluid level (if applicable), battery condition, fuses and relays.
2. Method 1: Ignition Cycle Reset: Turn off ignition, wait, turn on, start engine.
3. Method 2: Steering Wheel Calibration Reset: Full left, full right, center, turn off, restart.
4. Method 3: Battery Disconnect Reset: Disconnect negative terminal, wait, reconnect. Caution: Potential system resets.
5. Method 4: OBD-II Scanner Reset: Read and clear DTCs. Understand code meanings.
6. If Problem Persists: Seek professional help.

By following these steps, you can effectively troubleshoot and potentially resolve power steering assist faults in your vehicle, saving time, money, and ensuring your safety on the road. Remember to always prioritize safety and consult a professional when in doubt.