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Home >> Ford >> 2003 >> Cutaway 7.3 F >> Repair and Diagnosis >> External Pages >> Different car >> Section 2597 (Steering System - Hydraulic Power Assist Steering (HPAS) -- F250-F550 Super Duty) >> Diagnosis And Testing >> Steering System >> Pinpoint Tests >> Pinpoint Test A: Steering Has Lack of Assist or Inconsistent Assist - Vehicles with Vacuum Boost >> Pinpoint Test A: Steering Has Lack Of Assist Or Inconsistent Assist - Vehicles With Vacuum Boost

Pinpoint Test A: Steering Has Lack Of Assist Or Inconsistent Assist - Vehicles With Vacuum Boost

WARNING: This page is about a different car, the 2011 Ford Pickup, 2011 Ford F550 Super Duty, 2011 Ford F450 Super Duty, and 2011 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
  1. A1 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 can occur.
    • Set the engine at 2,100 rpm and turn the steering wheel fully to the left and right.
    • Is steering assist normal with the engine rpm raised? 
  2. A2 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? 
  3. A3 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  A4.
  4. A4 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 can 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.
    • While monitoring the engine revolutions per minute (RPM) PID, turn the steering wheel quickly to the left stop position and then to the right stop position.
    • Note the RPM PID during the turns.
    • Does the PID change (even temporarily) more than 30 rpm when turning the steering wheel? 
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