Audi A6 Typ 4G: Axle Alignment Information
Wheel alignment must only performed using VW/Audi-approved wheel alignment equipment.
Each time wheels are aligned, both front and rear wheels must be aligned.
Otherwise, proper vehicle drivability cannot be ensured.
Note
- Axle alignment should not be performed until the vehicle has been driven 1,000-2,000 km, since it takes this long for the suspension to settle.
- The individual specifications should be followed as exactly as possible when making adjustments.
Before performing an axle alignment on a vehicle with air suspension, check the curb weight or control position and adapt it again if necessary. Refer to → Chapter "Axle Alignment Control Position on Vehicles with Air Suspension, Checking".
WARNING
If the vehicle has ESP or ABS, calibrate the Steering Angle Sensor -G85- after making any adjustments on the suspension using the Vehicle Diagnostic Tester.
Caution
The suspension components could be damaged.
If the subframe mount, the steering gear or the subframe crossbrace are not installed correctly, do not rest the vehicle on its wheels.
The vehicle must not be supported on the subframe or the subframe crossbrace (for example using a floor jack).
WARNING
All bolts and nuts must be tightened properly before driving the vehicle!
WARNING
There is a risk of injury if the engine starts automatically in vehicles with the Start/Stop System.
- For vehicles with an activated Start/Stop System (recognizable from a notification in the instrument cluster), the motor can be started automatically if needed.
- Make sure that the start/stop system is deactivated when working on the vehicle (turn off the ignition, turn on the ignition when necessary).
Test Prerequisites
Follow the general information regarding vehicle alignment. Refer to → Chapter "Axle Alignment Information".
- Vehicle must be cool.
- Check suspension, steering and steering linkage for excessive play and damage, repair if necessary.
- Tread depth difference may be no more than 2 mm on an axle.
- Prescribed tire pressure
- Vehicle accurately aligned, suspension bounced and rocked several times
- Drive the vehicle onto the alignment rack without tension. Move the vehicle back and forth if necessary to relieve any tension on the axle components.
- The steering wheel must be "evened out" into the center position before beginning the measuring and adjusting. Use Steering Wheel Scales -VAS6458- for this.
- Vehicles with coil spring suspension in curb weight position, "curb weight position means: the vehicle weight (fuel tank full, as well as the windshield washer fluid reservoir for the windshield/headlamp washer system, spare wheel, vehicle tools and vehicle jack) with without the driver."
- Vehicle with air suspension in control position, "control position means: the height position of the vehicle without the driver". Refer to → Chapter "Axle Alignment Control Position on Vehicles with Air Suspension, Checking".
- Make sure that the sliding plates and turn tables are not touching the end stop when checking the wheel alignment.
- The measurement sensor must be properly adjusted and attached to the vehicle; observe device manufacturer's operating instructions.
- Perform wheel run-out compensation: Permissible axial run-out of the wheel rims can exceed the specified toe setting tolerance. If compensation for wheel run-out is not performed, it will not be possible to obtain a correct toe-in adjustment.
- Vehicle alignment platforms and the alignment equipment/alignment computers can deviate from their original calibration over time therefore they should be calibrated at least once a year during maintenance.
- Handle highly sensitive units with care.
- If necessary, contact the manufacturer for familiarization with the proper use of the equipment.
Measurement Preparations
Preparation Work for Calibrating and Adjusting Driver Assist Systems
Perform the following steps using "quick access" if one or more systems on the vehicle will be calibrated/adjusted (without a previous axle alignment):
- Before driving the vehicle onto the alignment stand, make sure there is enough space between the vehicle and the ACC Adjustment Device. Distance between the setting device and the vehicle: 120 cm +- 2.5 cm.
- If there is not sufficient space, drive vehicle backward on alignment stand in order to be able to use the corresponding space.
- Check the Diagnostic Trouble Code (DTC) memory and correct any malfunctions before beginning the calibration/adjusting.
- Vehicle accurately aligned, suspension bounced and rocked several times
- Make sure that the sliding plates and turn tables are not touching the end stop when checking the wheel alignment.
- Refer to the Owner's Manual and activate the changing a wheel mode.
- Connect the battery charger. Refer to → Electrical Equipment; Rep. Gr.27; Battery; Battery, Charging.
- Position the front wheels so they are straight.
- Connect the Vehicle Diagnostic Tester to the vehicle and guide the diagnostic cable through the open window.
- The vehicle exterior lamps are off.
- All the vehicle doors are closed.
- Using the screen, turn on the calibration/adjustment on the wheel alignment computer.
Measurement Preparations
Special tools and workshop equipment required
- Brake Pedal Actuator -VAG1869/2-.
- Steering Wheel Scales -VAS6458-
- For vehicles with air suspension Vehicle Diagnostic Tester
- Wheel Alignment Computer released by VW/Audi
Requirements
- The measurement sensor must be properly adjusted and attached to the vehicle; observe device manufacturer's operating instructions.
- Make sure that the sliding plates and turn tables are not touching the end stop when checking the wheel alignment.
- Drive the vehicle onto the alignment rack without tension. Move the vehicle back and forth if necessary to relieve any tension on the axle components.
- The steering wheel must be "evened out" into the center position before beginning the measuring and adjusting. Use Steering Wheel Scales -VAS6458- for this.
