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Home >> Ford >> 2009 >> Flex Limited, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 877 (Four Wheel Drive (4WD) Systems) >> Diagnostic Tests >> Four Wheel Drive (4WD) Systems - Electronic Shift >> Pinpoint Tests >> Pinpoint Test E: Straight line Driveline Wind-up >> Pinpoint Test E: Straight Line Driveline Wind-Up

Pinpoint Test E: Straight Line Driveline Wind-Up

WARNING: This page is about a different car, the 2007 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: 4x4 HIGH/4x4 LOW is not intended for driving on hard/dry surfaces.
  1. E1 VERIFY THE CONCERN 
    • Drive the vehicle and shift from 2WD to 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 excessive wind-up present? 
    1. YES  : Go to  E2.
    2. NO  : RETURN the vehicle to the customer. ADVISE about correct 4WD system operation and normal vehicle behavior.
  2. E2 CHECK FOR MATCHING WHEEL AND TIRE SIZES 
    • Check the wheel and tire sizes.
    • Do the 4 wheel and tire sizes match? 
    1. YES  : Go to  E3.
    2. NO  : ADVISE the customer that 4WD systems require 4 matched, correctly inflated, correctly maintained tires to operate correctly.
  3. E3 CHECK TIRE WEAR 
    • Check each of the 4 tires for wear.
    • Are the 4 tires worn evenly? 
    1. YES  : Go to  E4.
    2. NO  : ADVISE the customer that 4WD systems require 4 matched, correctly inflated, correctly rotated tires to operate correctly.
  4. E4 CHECK TIRE INFLATION PRESSURE 
    • Check the inflation pressure in each tire. Refer to vehicle certification label.
    • Are the tire inflation pressures correct? 
    1. YES  : Go to  E5.
    2. 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. E5 CHECK THE FRONT AND REAR AXLE RATIOS 
    1. YES  : RETURN the vehicle to the customer and ADVISE about correct 4WD usage and normal vehicle behavior.
    2. NO  : CHECK the vehicle identification label. INSTALL the correct axle(s). REFER to DRIVELINE SYSTEM - GENERAL INFORMATION article.
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