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Home >> Ford >> 2012 >> Mustang Base, 2D Coupe, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 128 (Steering System - Hydraulic Power Assist Steering - F150) >> Diagnosis And Testing >> Steering System >> Pinpoint Tests >> Pinpoint Test A: Steering Has a Lack of Assist or Inconsistent Assist >> Pinpoint Test A: Steering Has A Lack Of Assist Or Inconsistent Assist - RWD Vehicles

Pinpoint Test A: Steering Has A Lack Of Assist Or Inconsistent Assist - RWD Vehicles

WARNING: This page is about a different car, the 2012 Ford Pickup. 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, 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 an extended amount of time. 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 .
      • 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 POWER STEERING .
      • 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 an extended amount of time. 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 scan 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.
    • Enter the following diagnostic mode on the scan tool: DataLogger - PCM.
    • 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 RPM during the turns.
    • Does the engine speed change (even temporarily) by more than 30 RPM when turning the steering wheel? 
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