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Actuator diagnostics
Selective activation of dampers is possible using the actua-
tor diagnostics Test Plan. The dampers are then energized
with an electrical current of about 2 A.
Cold starting
This function can be initiated with the VAS Scan Tool. It
performs basically the same routine J250 performs auto-
matically when the ignition is switched on after a vehicle
down time of a least three hours.
The dampers are energized and the resistance values of the
coils in the damper pistons are evaluated. The resistance
values are assigned to the ambient temperature. This
assignment now provides the basis for the temperature
calculation by the temperature model.
This routine should always be executed after replacing the
control module because the new module does not know the
resistance values of the damper coils.
Load mode and Transport mode
In Audi TT models with Audi magnetic ride, unlike in vehi-
cles with adaptive air suspension, no special system set-
tings or modes are activated by activating the Load mode or
Transport mode.
It also makes sense to perform the function if one or more
dampers have been replaced. For tolerance reasons, the
coils of the new dampers have different resistance valves
than those already stored in the control module. However,
a condition for this is that the new dampers have approxi-
mately ambient temperature.
If the function is not executed, loss of comfort may subse-
quently occur while driving.
The next time the vehicle is started after a down time of at
least three hours, the coil resistances are defined automati-
cally by the system and the desired level of ride comfort is
again ensured.
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