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Pinpoint Test A: Vehicle Drifts/Pulls

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  1. A1 CHECK FOR UNEVENLY LOADED VEHICLE 
    • Visually check the vehicle for an uneven loading condition.
    • Is the vehicle unevenly loaded? 
    • Yes  : ADVISE the customer of uneven loading condition.
    • No  : GO to A2.
  2. A2 CHECK THE TIRE PRESSURE 
    • Check the tire pressures. Refer to the Vehicle Certification (VC) label located on the driver door jamb.
    • Is the tire pressure OK? 
    • Yes  : GO to A3.
    • No  : ADJUST the tire pressures to the specified pressure.
  3. A3 ISOLATE TIRE PULL CONDITION 
    • Cross the front wheel and tire assemblies from left-to-right. Refer to WHEELS AND TIRES .
    • Does the vehicle pull/drift? 
    • Yes  : If the vehicle drifts/pulls in the opposite direction, tire forces are causing the drift/pull. REFER to WHEELS AND TIRES to diagnose tire drift/pull. If the vehicle drifts/pulls in the same direction, GO to A4.
    • No  : Tire forces were causing the drift/pull and the concern has been corrected.
  4. A4 CHECK FOR BRAKE DRAG 
    • Spin all 4 wheel and tire assemblies by hand and check for brake drag.
    • Do the wheels spin freely? 
  5. A5 CHECK FOR STEERING SYSTEM DRIFT/PULL 
    • Check the steering system components. Refer to STEERING SYSTEM to diagnose steering system drift/pull/wander condition.
    • Is the steering system the cause of the drift/pull? 
    • Yes  : REPAIR the steering system as necessary.
    • No  : GO to A6.
  6. A6 CHECK THE WHEEL ALIGNMENT 
    • NOTE: A 1/4 degree to 1/2 degree side-to-side caster difference is usually sufficient to correct a drift/pull concern.

      Using alignment equipment and the manufacturer's instructions, check the wheel alignment.

    • Is the caster total/split and the camber total/split within specification? 
    • Yes  : ADJUST the caster total/split to counteract the drift/pull concern. REFER to GENERAL PROCEDURES . If the concern is vehicle drifts/pulls left, INCREASE the caster total/split toward the upper end of the specification range.

      If the concern is vehicle drifts/pulls right, DECREASE the caster total/split toward the lower end of the specification range.

    • No  : ADJUST the camber and caster total/split as close to the nominal specification as possible. REFER to GENERAL PROCEDURES .
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