Audi A4: Front Axle Camber, Centering

  Note

• Camber cannot be adjusted.
• Camber can be centered evenly within specified tolerance range by shifting subframe.

Procedure

- Remove the noise insulation. Refer to → Body Exterior; Rep. Gr.66; Noise Insulation; Noise Insulation, Removing and Installing.

- Remove the left and right wheel spoilers. Refer to → Body Exterior; Rep. Gr.66; Wheel Housing Liner; Front Wheel Housing Liner, Removing and Installing.

  Caution

There is a risk of damaging the threads on the subframe threaded connection to the body.

• The subframe bolts on the body must not be loosened or tightened with an impact wrench.
• Always install all bolts by hand for the first few turns.

- Remove the left and right bolts -1 and arrows- for the subframe one after the other and replace.

- Install the new bolts all the way by hand.

  Note

If the subframe is moved, the front of the vehicle must be lifted at the jack points using an axle lift.

- Move the subframe with a plastic-coated pry bar into the corresponding position -arrow-.

- To do so place the pry bar in the center of the subframe near the control arm between the subframe and the body longitudinal member.

  Note

If no plastic-coated pry bar is available, wrap a conventional pry bar with adhesive tape.

- The vehicle must be bounced several times at the front axle before checking the camber values.

• Axle alignment specified values. Refer to → Chapter "Axle Alignment Specified Values".

  WARNING

Risk of accident!

Replace the subframe bolts one after the other.

- Tighten the left and right subframe bolts diagonally in stages, and check the camber value again. Refer to → Chapter "Axle Alignment Specified Values".

  Caution

There is a risk of adjustment errors.

All axle alignment values must be checked after every camber correction.

Tightening Specifications

• Refer to → Chapter "Overview - Subframe"
• Refer to → Body Exterior; Rep. Gr.66; Wheel Housing Liner; Overview - Front Wheel Housing Liner.
• Refer to → Body Exterior; Rep. Gr.66; Noise Insulation; Overview - Noise Insulation.

Front Axle Toe, Adjusting

Procedure

- Measure the dimension -a- between the tie rod head -1- and the left and right tie rod -2- and make a note of the value. Dimension -a- should be the same before and after adjusting on the left and right.

- Loosen the lock nut -B- by counterholding the tie rod end -C-.

- Adjust the toe respectively at the left and right wheel with the hex fitting -A-.

  Caution

There is a risk of premature wear if the boot is twisted.

Be sure that boot is not twisted after turning tie rods.

- Tighten the lock nut -B--Item 5- → Item and check the toe-in value again.

  Note

• After tightening the lock nut -B-, it is possible that the value will deviate slightly.
• However, if the measured toe value lies within the tolerance, the adjustment is correct.

Steering Angle Sensor -G85- Basic Setting

Special tools and workshop equipment required

• Vehicle Diagnostic Tester
• Steering Wheel Scales -VAS6458-

Procedure

Select this basic setting for the following operations:

• The Steering Column Electronics Control Module -J527- was replaced.
• The Active Steering Control Module -J792- was replaced,
• The steering column was replaced.

- Connect the Vehicle Diagnostic Tester.

- Switch the ignition on.

- Select and start the Diagnostic operating mode.

- Select the Test plan tab.

- Select the Select individual test button and select the following tree structure consecutively:

• Body
• Electrical system
• 01 - OBD-capable systems
• 16 - Steering column electronics control module J527
• 16 - Steering column electronics control module function
• 16 - Steering Angle Sensor G85

- Start the selected program and follow the instructions on the Vehicle Diagnostic Tester display.

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