Service of Audi A4 from 2001 to 2005 release.
1. Operation and maintenance of the car
1.1. General information
1.2. Keys, locks of doors
1.3. Governing bodies, combination of devices and equipment of interior of the car
1.4. Seats and means of passive safety
1.5. Conditioning and heating
1.6. Driving and service of the car
1.6.1. Launch of the engine
1.6.2. Emergency brake
1.6.3. The help at the parking ahead and behind
1.6.4. System of regulation of speed
1.6.5. Automatic transmission
1.6.6. Klinotsepna variator of "Multitronic"
1.6.7. Operation of "Multitronic"
1.6.8. Electronic system of dynamic stabilization (ESP)
1.6.9. Antiblocking device brake systems
1.6.10. Electronic blocking of differential (EDS)
1.6.11. System of regulation of the drive of driving wheels (ASR)
1.6.12. Amplifier of the steering drive
1.6.13. System servotronik
1.6.14. Four-wheel drive ("Quattro")
1.6.15. The movement with the trailer
1.6.16. Removable traction coupling device
1.6.17. Control of level of oil
1.6.18. Cooling liquid
1.6.19. Rechargeable battery
1.6.20. Windscreen washer
1.6.21. Replacement of a wheel
1.6.22. Lifting of the car
1.6.23. Dismantle / installation of a wheel
1.6.24. Help of launch of the engine
1.6.25. Safety locks
1.6.26. Glow lamps
2. Engine
3. Transmission
4. Running gear
5. Steering mechanism
6. Brake system
7. Onboard electric equipment
8. Body
9. Schemes of electric equipment


1.6.10. Electronic blocking of differential (EDS)

Electronic blocking of differential prevents skidding of the corresponding wheel.
Under very adverse road conditions electronic blocking of differential (EDS) considerably facilitates start-off about places, dispersal and the movement uphill.
EDS works in the automatic mode, i.e. without participation of the driver. By means of sensors the ABS device controls the frequency of rotation of driving wheels. At a divergence of frequency of rotation of driving wheels (about 100 min.-1), for example, on slippery not on all width to the road, the revolving wheel is braked, and the wheels having the best coupling with the road receive the increased draft force. EDS works at a speed about no more than 40 km/h (the forward drive) or 80 km/h (four-wheel drive). Process of regulation is followed by characteristic noise.

Start-off from the place
At wheel skidding owing to difference of coefficient of coupling of driving wheels on roadbed width (for example, one wheel on ice) press an accelerator pedal until the car starts.
Heating of the brake mechanism
EDS is for a short time disconnected that the disk brake of the braking wheel at extraordinary high loading did not overheat. At the same time the car is ready for operation and has the same dynamic properties, as the car without EDS.
EDS automatically joins again right after cooling of the brake mechanism.

At dispersal on the road, equally slippery on all width, for example, in ice and snow, carefully press an accelerator pedal. There is a probability of skidding of driving wheels, despite EDS and by that violations of stability during the movement.

Fire of a control lamp of ABS can mean also malfunction of EDS. In this case as soon as possible address on the specialized enterprise.

1.6.9. Antiblocking device brake systems

1.6.11. System of regulation of the drive of driving wheels (ASR)