AUDI A6 ALLROAD 1999 C5 / 2.G Pneumatic Suspension System

AUDI A6 ALLROAD 1999 C5 / 2.G Pneumatic Suspension System https://www.carmanualsonline.info/img/6/840/w960_840-0.png AUDI A6 ALLROAD 1999 C5 / 2.G Pneumatic Suspension System

Page 21 of 44

AUDI A6 ALLROAD 1999 C5 / 2.G Pneumatic Suspension System 21
The 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 are closed 
without current. The pressure on the

Page 22 of 44

AUDI A6 ALLROAD 1999 C5 / 2.G Pneumatic Suspension System 22
p
Temperature sensor G290
(Overheat protection)
To enhance system availability, temperature 
sensor G290 is attached to the cylinder head 
of the compressor.
A temperature model is implemented in

Page 23 of 44

AUDI A6 ALLROAD 1999 C5 / 2.G Pneumatic Suspension System 23
Vehicle level senders G76, 
G77, G78, G289 (level 
sensors)
The level sensors are so-called angle sensors. 
With the aid of the connecting link kinematics 
unit, the height changes of the vehicle b

Page 24 of 44

AUDI A6 ALLROAD 1999 C5 / 2.G Pneumatic Suspension System 24
System components
243_033
243_037
For technical reasons, the voltage for the left-
hand level sensors (front left G78 and rear left 
G76) is supplied by the headlamp range 
control unit J431. Power

Page 25 of 44

AUDI A6 ALLROAD 1999 C5 / 2.G Pneumatic Suspension System 25
The rotor consists of a closed conductor loop  
connected to the sender arm (rotates with the 
sender arm). The conductor loop has the 
same geometric shape as the receiver coils. 
Construction/des

Page 26 of 44

AUDI A6 ALLROAD 1999 C5 / 2.G Pneumatic Suspension System 26
System components
Function
The exciter coil is subjected to an alternating 
current which produces an electromagnetic 
alternating field, the induction of which is 
penetrated by the rotor.
The cu

Page 27 of 44

AUDI A6 ALLROAD 1999 C5 / 2.G Pneumatic Suspension System 27
Warning lamp K134...
... illuminates for one second when 
terminal 15 is ON (self-test).
... is constantly illuminated in the 
case of relevant system errors or 
when the system is switched off.
..

Page 28 of 44

AUDI A6 ALLROAD 1999 C5 / 2.G Pneumatic Suspension System 28
F
F
F
F
F
S
F
S
S F
3
1
7
52/25
2/50
2/49
2/05
2/04
2/01
2/02 9
10
4
8
System components
Control unit J197 transmits the information 
concerning the vehicle level and the system 
status back to the

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AUDI A6 ALLROAD 1999 C5 / 2.G Pneumatic Suspension System 29
CAN information exchange
In the case 4-level air suspension, the 
information exchange between control unit 
J197 for the self-levelling system and the 
networked control units is performed via the

Page 30 of 44

AUDI A6 ALLROAD 1999 C5 / 2.G Pneumatic Suspension System 30
The driving speed signal …
... is a square-wave signal produced by the 
dash panel, the frequency of which is 
changed in accordance with the vehicle 
speed. 
... is required in the evaluation of
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