The “Power Steering Assist Fault” message can indicate problems with components that make steering your Ford Fusion easier. This article is aimed at DIYers and basic mechanics looking to troubleshoot and repair this issue.
Understanding How the Electric Power Steering System Works
The electric power steering system uses an electric motor to provide assistance when turning the steering wheel. This allows for easier steering, especially at low speeds.
The “Power Steering Assist Fault” message indicates a fault in components that enable this assistance. Without power steering assist, much more effort will be needed to turn the steering wheel.
Common Causes of the Power Steering Assist Fault
- Electrical issues like a blown fuse, damaged wiring harness, or loose connector are common culprits. These can prevent power from reaching system components.
- Sensor malfunctions such as a faulty wheel speed sensor or failed steering angle sensor can also trigger the fault light. Sensors provide key inputs to control steering assist.
- Mechanical faults like problems with the steering motor or internal steering rack assembly may require repair or replacement of these components. These failures directly impact assist capability.
Severity varies. Electrical issues may be simpler DIY fixes. Mechanical and some sensor issues likely need professional diagnosis and repair.
Model Year Specific Issues to Consider
2010-2012 models had more power steering problems and a recall for corrosion of the motor mounting bolts. 2013-2018 models saw fewer electrical issues but more rack and pinion wear problems.
Diagnosis and Troubleshooting Tips
- Safety first – secure the vehicle properly on jack stands if inspecting underside components.
- Useful tools include a multimeter for electrical testing, wrenches, and screwdrivers.
- Visually inspect wiring harnesses and connectors for damage. Check motor mount bolts for corrosion. Verify proper steering fluid level.
- Locate and test fuse #F19 in the under-hood fuse box as an early troubleshooting step.
- Inspect wheel speed sensors for debris and proper spacing from tone rings if equipped.
DIY Repair Guide
- When attempting any repair, ensure the vehicle is turned off and properly secured on jack stands. Wear eye protection and insulated gloves when working with electrical components.
- Replacing a blown power steering assist fuse:
- Locate the under-hood fuse box, usually on the driver’s side. Consult the fuse diagram on the fuse box lid to find fuse #F19.
- Remove the blown fuse with the fuse puller tool from the fuse box.
- Insert a replacement fuse of the same amperage rating. For fuse #F19, a 25A fuse is commonly used.
- Start the vehicle and verify the power steering assist fault no longer appears. If it does, a blown fuse may not be the only issue.
- Inspecting wiring harness connectors:
- Locate the vehicle-side connectors along the steering column and steering rack.
- Check for loose connectors by gently wiggling them while installed. Tight connections should not move.
- If loose, release connector locking tabs and firmly reseat each half together until the tabs click.
- Verify wires are not damaged before reconnecting. Apply dielectric grease to contact surfaces to prevent future corrosion.
Consult professional Ford service manuals before attempting repairs of sensors, motors, or other complex components. Steering system repairs require specialized tools and training. Safety remains paramount working under the vehicle.
Repair Considerations and Options
- Simple fixes: Simple fixes include replacing damaged fuses, reseating connectors, or cleaning dirty sensors.
- Intermediate fixes: For sensor faults, consider replacement after systematic diagnosis. Guidance helps avoid unnecessary costs.
- Professional repair: For internal steering component issues, repairs often require professional service for quality results.
Labor and parts can add up quickly. Compare component replacement versus steering rack overhaul costs if applicable.
John Smith, a Los Angeles-based car specialist and automotive writer, boasts over 20 years in the industry. With a background as a master technician and a decade-long writing stint at notable automotive publications, John now shares his expansive knowledge on CarFinite, simplifying car maintenance for readers.