Pinpoint Test D: STRAIGHTLINE Driveline Wind-Up
WARNING: This page is about a different car, the 2005 Mercury Mountaineer and 2005 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
AWD LOCKED mode is not intended for driving on hard/dry surfaces.
- D1 VERIFY THE CONCERN
- Drive the vehicle and switch from AWD AUTO to AWD LOCKED. There should be minimal wind-up in AWD LOCKED mode during straight line maneuvers, (wind-up in turns is normal; AWD LOCKED is not intended for driving on hard/dry surfaces).
- Is excessive wind-up present?
- Yes : GO to D2.
- No : RETURN the vehicle to the customer. ADVISE about correct AWD system operation and normal vehicle behavior.
- D2 CHECK FOR MATCHING WHEEL AND TIRE SIZES
- Check the wheel and tire sizes.
- Do the 4 wheel and tire sizes match?
- Yes : GO to D3.
- No : ADVISE the customer that AWD systems require 4 matched, correctly inflated, correctly maintained tires to operate correctly.
- D3 CHECK TIRE WEAR
- Check each of the 4 tires for wear.
- Are the 4 tires worn evenly?
- Yes : GO to D4.
- No : ADVISE the customer that AWD systems require 4 matched, correctly inflated, correctly rotated tires to operate correctly.
- D4 CHECK TIRE INFLATION PRESSURE
- Check the inflation pressure in each tire. Refer to vehicle certification label.
- Are the tire inflation pressures correct?
- Yes : GO to D5.
- No : ADJUST the tire pressure as necessary. TEST the vehicle for normal operation. ADVISE the customer that AWD systems require 4 matched, correctly inflated, correctly maintained tires to operate correctly.
- D5 CHECK THE FRONT AND REAR AXLE RATIOS
- Check that front and rear axle ratios match. Refer to DRIVELINE SYSTEM-GENERAL INFORMATION .
- Do the front and rear axle ratios match?
- Yes : RETURN the vehicle to the customer and ADVISE about correct AWD usage and normal vehicle behavior.
- No : CHECK the vehicle identification label. INSTALL the correct axle(s). REFER to REAR DRIVE AXLE/DIFFERENTIAL - FORD 8.8-INCH RING GEAR and FRONT DRIVE AXLE/DIFFERENTIAL - DANA 30 .