Audi A6 242 Manuel d'utilisateur

Service.For internal use onlyAll rights reserved, including the right to make technical changes.AUDI AGDept. I/VK-5D-85045 IngolstadtFax 0841/89-36367

10 If the vehicle is at high level 2, it will lower automatically to high level 1 at a speed of > 35 km/h. The system will respond to a request to

11 Motorway mode If the vehicle travels for longer than 30 seconds at over 120 km/h (vehicle is already at normal level), it will automatically be lo

12 Control strategies The vehicle rises automatically to high level 1 at the following speeds and time thresholds:If the system has lowered the vehi

13 If, for example, the vehicle is at high level 2 with active ESP influences and the driver accelerates sharply on a very winding route, speeds of &g

14 The air springs The front air spring is a new design.As on the rear axle, the air springs are combined coaxially with the dampers as a suspension

15 Rear suspension strut The bayonet connection must be absolutely clean and is greased with a special lubricant before installation (see Workshop Ma

16 System components 243_006243_007 WrongCorrect Air springs must not be moved when pressureless because the air bellows cannot unroll on the piston

17 Air supply The compressor The construction and function of the compressor corresponds largely to the unit described in the self-levelling suspensi

18 System components A special mounting consisting of spiral springs and rubber damping elements prevents the transfer of vibrations to the bodywork.

19Pressure accumulatorThe pressure accumulator allows the vehicle level to be raised more rapidly with minimal noise as the pressure accumulator is on

2 The 4-level air suspension system in the allroad quattro is a logical development of the self-levelling system in the Audi A6. The principles of the

20System componentspPneumatic diagram1 Additional noise damper2 Non-return valve 13 Air dryer4 Non-return valve 35 Non-return valve 26 Discharge throt

21The 4 air spring valves N148, N149, N150, N151 and accumulator valve N311 are combined in one valve unit. They are designed as 2/2 way valves and ar

22pTemperature sensor G290(Overheat protection)To enhance system availability, temperature sensor G290 is attached to the cylinder head of the compres

23Vehicle level senders G76, G77, G78, G289 (level sensors)The level sensors are so-called angle sensors. With the aid of the connecting link kinemati

24System components243_033243_037For technical reasons, the voltage for the left-hand level sensors (front left G78 and rear left G76) is supplied by

25The rotor consists of a closed conductor loop connected to the sender arm (rotates with the sender arm). The conductor loop has the same geometric s

26System componentsFunctionThe exciter coil is subjected to an alternating current which produces an electromagnetic alternating field, the induction o

27Warning lamp K134... illuminates for one second when terminal 15 is ON (self-test)... is constantly illuminated in the case of relevant system e

28FFFFFSFSSF31752/252/502/492/052/042/012/0291048System componentsControl unit J197 transmits the information concerning the vehicle level and the sys

29CAN information exchangeIn the case 4-level air suspension, the information exchange between control unit J197 for the self-levelling system and the

3 Contents System description . . . . . . . . . . . . . . . . . . . . 4 The self-study programme is not intended as a workshop manual. The self-stu

30The driving speed signal …... is a square-wave signal produced by the dash panel, the frequency of which is changed in accordance with the vehicle s

311231 2378496513BL NSL 31 58l RF BR 30 34 58r 3110 11 12The trailer operation signal …... comes from the F216 contact switch in the trailer socket.

32Interfacespt°M1ABCD2 3 4IV III II I5 6 79 128MM31Functional diagramTerminal 15 Terminal 30T.3 4Terminal 30SSSN150N151N311N148N149G291V66G290N111J197

33Key to function diagramE281 Self-levelling suspension operating unit F216 Contact switch for switchable rear fog lightG76 Self levelling suspension

34However, all level sensors (left and right) are required in the air suspension system run-up and run-on mode (ignition OFF). To allow the left-hand

35Level change process:Raising - rear axle first, then front axle Lowering - front axle first, then rear axle ModesHeight mode/driving modeReaction time

36Control conceptsThe system can switch between sleep mode and run-on/run-up mode, triggered via the door contact signal, a maximum of 15 times. For t

37In trailer operation, normal mode must always be selected and care must be taken that the system is switched to manual mode (e.g. no automatic switc

38Special toolsAdapter cable 1598/35 with test box 1598/14 are used for fault finding and function testing of sensors and signals of the 4-level air su

39Basic system setting The basic system setting of the reference level in the 4-level air suspension system is performed by inputting body-level measu

4 Description of the system The vehicle level is determined separately at each axle side by means of 4 level sensors. Each air suspension strut is al

40Self-diagnosisAddress word: 34 Self levelling suspensionBoth generations of diagnostic tester (V.A.G. 1551/1552 and VAS 5051) are suitable for com

41Allroad quattro control strategies4-level air suspension + additional shift stage02035 80605100 120 130 20030General overviewControl unit 4Z7 907

42Notes

43

Service.For internal use onlyAll rights reserved, including the right to make technical changes.AUDI AGDept. I/VK-5D-85045 IngolstadtFax 0841/89-36367

5 The 4-level air suspension system is designed as what is known as a pressure accumulator system.The pressure accumulator system increases system av

6 Description of the system • The 4 level stages can be controlled manually or automatically within defined limits (see page 8 onwards).• Individual a

7 Operation and display Operation The self-levelling control unit E281 is used to control the 4-level air suspension and the display/monitor the syst

8 Operation and display If the actual level deviates greatly from the reference level, this is indicated to the driver with flashing LEDs (according t

9 243_022243_023243_024243_025 Other button functions Automatic switching The so-called “manual mode” can be switched on or off by pressing the “rais