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Pinpoint Test A : Steering Has A Lack Of Assist Or Inconsistent Assist

WARNING: This page is about a different car, the 2018 Ford F-550 Super Duty, 2018 Ford F-450 Super Duty, 2018 Ford F-350 Super Duty, and 2018 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.

  1. A1 CHECK FOR POWER STEERING FLUID CONTAMINATION

    • Check the power steering fluid for contamination.

    Is the power steering fluid free of any contamination? 

    Yes  GO to  A2
    No  FLUSH the power steering system. Refer to: Power Steering System Flushing . TEST the system for normal operation. If the assist concern is still present, PURGE the power steering system. Refer to: Power Steering System Purging . TEST the system for normal operation. If the assist concern is still present, GO to  A2

  2. A2 CHECK THE STEERING ASSIST WITH THE ENGINE SPEED RAISED

    • NOTE: Do not hold the steering wheel at the stops for more than 5 seconds. Damage to the power steering pump may occur.

      Set the engine speed to 2, 100 RPM and turn the steering wheel fully to the left and right.

    Is steering assist fully restored to normal with the engine speed raised? 

    Yes  INSTALL a new power steering pump. Refer to: Power Steering Pump - 6.7L Power Stroke Diesel . or REFER to: Power Steering Pump - 6.8L Triton-30V - V10 .
    No  GO to  A3

  3. A3 CHECK FOR A CHANGE IN ASSIST ON LEFT AND RIGHT TURNS

    • With the engine running at idle, turn the steering wheel fully to the left and to the right.

    Does the steering assist change when turning from right to left? 

    Yes  INSTALL a new power steering gear. Refer to: Steering Gear - Vehicles With: Hydro-Boost™ .
    No  GO to  A4

  4. A4 CHECK THE STEERING LINES AND HOSES FOR RESTRICTIONS

    • Inspect the steering lines and hoses for damage, kinks or restrictions.

    Are the steering lines and hoses free from any damage, kinks and/or restrictions? 

    Yes  GO to  A5
    No  INSTALL new lines and/or hoses as necessary. TEST the system for normal operation.

  5. A5 MONITOR THE ENGINE SPEED CHANGES

    NOTE: Do not hold the steering wheel at the stops for more than 5 seconds. Damage to the power steering pump may occur.
    NOTE: Make sure that the vehicle is on a flat dry surface, all accessories are in the OFF position and that the steering system is at normal operating temperature.

    • Connect the diagnostic tool.

    • Start the engine.

    • With the engine running at idle, raise the power steering fluid temperature to 74 °- 80 °C (165 °-176 °F) by rotating the steering wheel fully to the left and to the right several time.

    • Using a diagnostic scan tool, monitor the Engine Revolutions Per Minute (RPM) PID while turning the steering wheel quickly to the left stop position and then to the right stop position.

    • Note the engine Revolutions Per Minute (RPM) during the turns.

    Does the engine speed change (even temporarily) by more than 30 RPM when turning the steering wheel? 

    Yes  INSTALL a new power steering gear. Refer to: Steering Gear - Vehicles With: Hydro-Boost™ .
    No  INSTALL a new power steering pump. Refer to: Power Steering Pump - 6.7L Power Stroke Diesel . or REFER to: Power Steering Pump - 6.8L Triton-30V - V10 .
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