Pinpoint Test O: STRAIGHTLINE Driveline Wind-Up
- O1 VERIFY THE CONCERN
- Drive the vehicle and shift from 2H to 4H. There should be minimal wind-up in 4H mode during straight-line maneuvers, (wind-up in turns is normal; 4x4 high/low is not intended for driving on hard/dry surfaces).
- Is wind-up present?
Yes : GO to O2.
No : RETURN the vehicle to the customer and ADVISE about correct 4x4 usage and normal vehicle behavior.
- O2 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 O3.
No : ADVISE the customer that 4x4 systems require 4 matched, correctly inflated and correctly maintained tires to operate correctly.
- O3 CHECK TIRE WEAR
- Check each of the 4 tires for wear.
- Are the 4 tires worn evenly?
Yes : GO to O4.
No : ADVISE the customer that 4x4 systems require 4 matched, correctly inflated and correctly maintained tires to operate correctly.
- O4 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 O5.
No : ADJUST the tire pressure as necessary. TEST the vehicle for normal operation. ADVISE the customer that 4x4 systems require 4 matched, correctly inflated, correctly maintained tires to operate correctly.
- O5 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 4x4 system operation and normal vehicle behavior.
No : CHECK the vehicle identification label. INSTALL the correct axle(s). REFER to DRIVELINE SYSTEM-GENERAL INFORMATION .