Pinpoint Test N: Straightline Driveline Wind Up

Four Wheel Drive (4WD) Systems - Electronic Shift







Pinpoint Tests

Pinpoint Test N: Straightline Driveline Wind Up

Normal Operation

In order for the Four-Wheel Drive (4WD) system to function correctly, tires and wheels must be the same size, be in good condition and the front and rear axle ratios must match.

This pinpoint test is intended to diagnose the following:
- Wheel and tire assemblies
- Front and rear axles



PINPOINT TEST N: STRAIGHTLINE DRIVELINE WIND UP

NOTE: 4X4 High or 4X4 Low is not intended for driving on hard/dry surfaces.

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N1 VERIFY THE CONCERN


- Drive the vehicle and shift from 2-Wheel Drive (2WD) high to 4WD high (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 wind up present?

Yes
GO to N2.

No
RETURN the vehicle to the customer and ADVISE about correct 4WD usage and normal vehicle behavior.

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N2 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 N3.

No
ADVISE the customer that 4WD systems require 4 matched, correctly inflated and correctly maintained tires to operate correctly.

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N3 CHECK TIRE WEAR


- Check each of the 4 tires for wear.
- Are the 4 tires worn evenly?

Yes
GO to N4.

No
ADVISE the customer that 4WD systems require 4 matched, correctly inflated and correctly maintained tires to operate correctly.

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N4 CHECK TIRE INFLATION PRESSURE


- Check the inflation pressure in each tire. Refer to Vehicle Certification (VC) label.
- Are the tire inflation pressures correct?

Yes
GO to N5.

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.

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N5 CHECK THE FRONT AND REAR AXLE RATIOS


- Check that front and rear axle ratios match. Refer to Differential Assembly &/or Axle Shaft Assembly &/or Drive/Propeller Shafts, Bearings and Joints.
- Do the front and rear axle ratios match?

Yes
RETURN the vehicle to the customer and ADVISE about correct 4WD system operation and normal vehicle behavior.

No
CHECK the vehicle identification label. INSTALL the correct axle(s). REFER to Differential Assembly &/or Axle Shaft Assembly &/or Drive/Propeller Shafts, Bearings and Joints.

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