This procedure documents the power steering service for the 2015-2020 Ford F-150 3.5L EcoBoost, which uses an Electric Power Assist Steering (EPAS) system requiring no fluid service.

Warnings

Tools required

Preparation

1. Confirm vehicle is equipped with Electric Power Assist Steering (EPAS) by checking for absence of power steering reservoir under hood
2. Ensure ignition is off and key is removed from vehicle
3. Park vehicle on level surface and engage parking brake

Procedure

1. 1

   Verify EPAS System
   Locate the steering column and verify the presence of the electric power steering motor mounted to the steering rack. Confirm there is no power steering fluid reservoir, pump, or hydraulic lines present in the engine bay. The EPAS system is maintenance-free and requires no fluid service.
2. 2

   Inspect Steering Components
   Visually inspect the steering column, intermediate shaft, and steering rack boots for damage, wear, or looseness. Check all electrical connections to the EPAS motor for corrosion or damage. Inspect tie rod ends and ball joints for wear.
3. 3

   Check for Diagnostic Trouble Codes
   Connect an OBD-II scanner to the vehicle's diagnostic port. Turn ignition to ON position without starting engine. Scan for any power steering related trouble codes, particularly those beginning with C or U prefixes related to the steering system module.
4. 4

   Test Steering Operation
   Start the engine and turn the steering wheel lock-to-lock while stationary. Listen for unusual noises, grinding, or binding. The EPAS system should provide smooth, consistent assist. Check that steering effort increases appropriately at highway speeds and decreases at parking speeds.
5. 5

   Document Findings
   Record any diagnostic codes, unusual noises, or operational issues. If steering concerns exist, refer to Ford service manual for EPAS system diagnostic procedures. Common issues include steering angle sensor calibration, EPAS motor failure, or electrical connection problems requiring specialized diagnosis.

Reassembly

1. No disassembly or reassembly required for this inspection procedure
2. If diagnostic codes were cleared, perform steering angle sensor relearn procedure per Ford service manual if required

Verification

• Confirm no diagnostic trouble codes are present in the power steering system
• Verify smooth steering operation with appropriate assist at all speeds
• Ensure all electrical connections to EPAS motor are secure and free of corrosion
• Test drive vehicle to confirm normal steering feel and operation

More procedures for this vehicle