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Home >> Ford >> 2012 >> Mustang Base, 2D Coupe, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 532 (Steering System - Hydraulic Power Assist Steering) >> 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 2014 Ford F-150. 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: Data Logger - 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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