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Home >> Ford >> 2003 >> Cutaway 7.3 F >> Repair and Diagnosis >> External Pages >> Different car >> Section 2501 (Transfer Case - Four Wheel Drive (4WD) Systems -- F250-F550 Super Duty) >> Diagnosis And Testing >> Four Wheel Drive (4WD) Systems - Electronic Shift >> Pinpoint Tests >> Pinpoint Test N: Straightline Driveline Wind Up >> Pinpoint Test N: STRAIGHTLINE Driveline Wind Up

Pinpoint Test N: STRAIGHTLINE Driveline Wind Up

WARNING: This page is about a different car, the 2010 Ford Pickup, 2010 Ford F550 Super Duty, 2010 Ford F450 Super Duty, and 2010 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: 4X4 High or 4X4 Low is not intended for driving on hard/dry surfaces.
  1. N1 VERIFY THE CONCERN 
    • Drive the vehicle and shift from 2-Wheel Drive (2WD) high to 4WD  high (4X4 High). There should be minimal wind-up in 4X4 High mode during straight line maneuvers, (wind-up in turns is normal; 4X4 high/4X4 low is not intended for driving on hard/dry surfaces).
    • Is wind up present? 
    • Yes:  GO to N2  .
    • No:  RETURN the vehicle to the customer and ADVISE about correct 4WD  usage and normal vehicle behavior.
  2. N2 CHECK FOR MATCHING WHEEL AND TIRE SIZES 
    • Check each of the 4 tire/wheel 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 correctly 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 correctly maintained tires to operate correctly.
  4. N4 CHECK TIRE INFLATION PRESSURE 
    • 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, correctly maintained tires to operate correctly.
  5. N5 CHECK THE FRONT AND REAR AXLE RATIOS 
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