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Home >> Ford >> 2018 >> Focus SEL, 4D Hatchback >> Repair and Diagnosis >> External Pages >> Different car >> Section 120 (Four-Wheel Drive Systems) >> Diagnosis And Testing >> Four Wheel Drive (4WD) Systems - 1-Speed Torque-On-Demand >> Pinpoint Tests >> Pinpoint Test G : STRAIGHTLINE Driveline Wind-Up >> Pinpoint Test G : STRAIGHTLINE Driveline Wind-Up

Pinpoint Test G : STRAIGHTLINE Driveline Wind-Up

WARNING: This page is about a different car, the 2017 Lincoln Navigator and 2017 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: 4X4 is not intended for driving on hard/dry surfaces; using 4X4 mode while driving on these surfaces may produce noises like intermittent clunking, but does not damage driveline components.

  1. G1 VERIFY THE CONCERN

    • Drive the vehicle and switch from 4X4 AUTO mode to 4X4 mode. There should be minimal wind-up in 4X4 mode during straight line maneuvers (wind-up in turns is normal; 4X4 mode is not intended for driving on hard/dry surfaces).

    Is excessive wind-up present? 

    Yes  GO to  G2.
    No  RETURN the vehicle to the customer. ADVISE customer about correct 4WD system operation and normal vehicle behavior.

  2. G2 CHECK FOR MATCHING WHEEL AND TIRE SIZES

    • Check the wheel and tire sizes.

    Do the 4 wheel and tire sizes match? 

    Yes  GO to  G3.
    No  ADVISE the customer that 4WD systems require 4 matched, properly inflated, and maintained tires to operate properly.

  3. G3 CHECK TIRE WEAR

    • Check each of the 4 tires for wear.

    Are the 4 tires worn evenly? 

    Yes  GO to  G4.
    No  ADVISE the customer that 4WD systems require 4 matched, properly inflated, and maintained tires to operate properly.

  4. G4 CHECK TIRE INFLATION PRESSURE

    • Check the inflation pressure in each tire. Refer to VC label.

    Are the tire inflation pressures correct? 

    Yes  GO to  G5.
    No  ADJUST the tire pressure as necessary. ADVISE the customer that 4WD systems require 4 matched, properly inflated, and maintained tires to operate properly.

  5. G5 CHECK THE FRONT AND REAR AXLE RATIOS

    Do the front and rear axle ratios match? 

    Yes  RETURN the vehicle to the customer ADVISE customer about correct 4WD usage and normal vehicle behavior.
    No  CHECK the VIL. INSTALL the correct axle(s). REFER to Rear Drive Axle/Differential - Ford 9.75-Inch Ring Gear and Front Drive Axle Differential .
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