Audi TT (2007 year). Manual — part 237

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permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

29

Shock absorber test

When the button is pressed for longer than 5 s, the
magnetic coils are activated by the application of a
constant electrical current.In this state, the shock
absorbers can be tested on the test bench.

The indicator LED in the button flashes when the
"shock absorber test" mode is active. The system
exists the mode automatically when the button is
pressed again, after ignition on/off or when driving
at a speed of at least 10 kph.

381_041

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

30

Audi magnetic ride

381_042

Positive

Earth

Powertrain CAN bus

Input signal

Output signal

J250

ECD control unit (electronically controlled damping)

G76-78,G289 Vehicle level senders
N336-339

Damper adjustment valves

E387

Shock absorber damping adjustment button

Function diagram

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

31

CAN data exchange

381_043

J250 ECD control unit (electronically controlled
damping)
System status (2,5,8)
Activation of warning lamp, text display (8,5)
Position of button E387 (2,5,8)
Height front right, front left, rear right, rear left (4)
Automatic activation ESP (2,5,8)

J533 Diagnostic interface (8)
Date, time
Terminal 15 -counter
Mileage (km)
Time not in use

J519 Onboard power supply control unit (9)
Status of terminal 50

J220 Motronic control unit (1)
Momentary position of brake light switch, brake test
switch
Coolant temperature
Intake air temperature (ambient temperature)
Engine torque
Driver torque input

J104 ESP control unit (2)
ESP on or off
ESP system status
Momentary vehicle speed
ABS active
Lateral acceleration
Brake pressure
Yaw rate

J527 Steering column electronics control unit (3)

G85 Wheel angle sender
Max. steering angle
Steering speed
Status of terminal 30

J431 Headlight range control,
control unit (4)
(receiver only)

J285 Control unit with display in dash panel insert (5)
Time not in use of the vehicle
Status of combined light (terminal 58d)
Ambient temperature
VIN

Information sent by control unit J250

Information received and evaluated
by control unit J250

Powertrain CAN bus

Dash panel insert CAN bus

Convenience CAN bus

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

32

Service work

Address

The system can be addressed in the diagnostic
tester under the address: 14 Wheel damping.

System initialisation - teaching in the new standard
position

The system initialisation must be performed when
the control unit J250 and/or one or more vehicle
level senders is replaced. The characteristic curves
of the vehicle level sender are stored in the control
unit
During the system initialisation procedure, the con-
trol unit is informed which vehicle ride heights at
the wheel positions match the actual measured val-
ues generated by the vehicle level sender. If these
assignments are known to the control unit, then all
measured values generated subsequently by the
vehicle level sender can be converted to vehicle ride
heights. The basic system initialisation procedure is
identical to the procedure for initialising the aas
systems in the A6 and A8. The system initialisation
can only be performed when the code control unit is
coded.

381_046

Coding

The coding tells the control unit the powertrain type
and engine type of the vehicle. The control unit
accepts the new coding after ignition on/off.

1 = heavy engine (6-cylinder)

3 = lightweight engine (4-cylinder)

3 = coupé with front-wheel drive

8 = coupé quattro

381_045

Audi magnetic ride