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

WARNING: This page is about a different car, the 2010 Lincoln MKX and 2010 Ford Edge. 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 contaminated? 
    • Yes:  FLUSH the power steering system. REFER to POWER STEERING SYSTEM FLUSHING . CHECK the system for normal operation. If assist concern still exists, GO to A2  .
    • No:  GO to A2  .
  2. A2 CHECK THE STEERING ASSIST WITH THE ENGINE RPM 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 at 2,100 rpm and turn the steering wheel fully to the left and right.
    • Is steering assist fully restored to normal with the engine rpm raised? 
    • Yes:  INSTALL a new power steering pump. REFER to POWER STEERING .
    • No:  GO to A3  .
  3. A3 CHECK FOR A CHANGE OF ASSIST ON LEFT AND RIGHT TURNS 
    • With the engine 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 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 or hoses damaged, kinked or restricted? 
    • Yes:  INSTALL new lines or hoses as necessary.
    • No:  GO to A5  .
  5. A5 MONITOR THE ENGINE RPM 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 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 right several times.
    • 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 rpm change (even temporarily) more than 30 rpm when turning the steering wheel? 
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