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Home >> Ford >> 2012 >> Mustang Base, 2D Coupe, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 345 (Four Wheel Drive (4WD) Systems) >> Diagnosis And Testing >> Four Wheel Drive (4WD) Systems - Electronic Shift >> Pinpoint Tests >> Pinpoint Test N: Vehicle Pulsates or Shudders in a Straight Line (Straight Line Driveline Wind Up) >> Pinpoint Test N: Vehicle Pulsates Or Shudders In A Straight Line (STRAIGHTLINE Driveline Wind Up)

Pinpoint Test N: Vehicle Pulsates Or Shudders In A Straight Line (STRAIGHTLINE Driveline Wind Up)

WARNING: This page is about a different car, the 2013 Ford F-550 Super Duty, 2013 Ford F-450 Super Duty, 2013 Ford F-350 Super Duty, and 2013 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
WARNING: When directed to drive the vehicle as part of this test, drive the vehicle on a hard surface in an area without traffic to prevent a crash. Failure to follow these instructions may result in personal injury.
NOTE: 4H (4X4 HIGH) or 4L (4X4 LOW) is not intended for driving on hard/dry surfaces.
NOTE: Make sure both CVH dials are in the same position.
  1. N1 VERIFY THE CONCERN 
    • Drive the vehicle and shift from 2H to 4H. There should be minimal wind up in 4H mode during straight line maneuvers, (wind up in turns is normal; 4H/4L is not intended for driving on hard/dry surfaces).
    • Is excessive wind up present? 
    • Yes  : GO to N2.
    • No  : RETURN the vehicle to the customer. ADVISE about correct 4WD system operation and normal vehicle behavior.
  2. N2 CHECK FOR MATCHING WHEEL AND TIRE SIZES 
    • Check the wheel and tire sizes.
    • Do the 4 wheels and tires match? 
    • Yes  : GO to N3.
    • No  : ADVISE the customer that 4WD systems require 4 matched, correctly inflated and maintained tires to operate correctly.
  3. N3 CHECK TIRE WEAR 
    • Check each of the 4 tires for wear.
    • Are the 4 tires worn evenly? 
    • Yes  : GO to N4.
    • No  : ADVISE the customer that 4WD systems require 4 matched, correctly inflated and maintained tires to operate correctly.
  4. N4 CHECK TIRE INFLATION PRESSURE 
    • Check the inflation pressure in each tire. Refer to Vehicle Certification (VC) label.
    • Are the tire inflation pressures correct? 
    • Yes  : GO to N5.
    • No  : ADJUST the tire pressure as necessary. TEST the vehicle for normal operation. ADVISE the customer that 4WD systems require 4 matched, correctly inflated and maintained tires to operate correctly.
  5. N5 CHECK THE FRONT AND REAR AXLE RATIOS 
    • Yes  : RETURN the vehicle to the customer and ADVISE about correct 4WD system operation and normal vehicle behavior.
    • No  : CHECK the VC. INSTALL the correct axle(s). REFER to DRIVELINE SYSTEM - GENERAL INFORMATION .
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