Audi A3 Sportback, Сервисная инструкция, Страница: 31 / 60

31
The boost pressure and intake pressure are
converted to a control pressure by the pulsed
charge pressure control solenoid valve N75. The
applied control pressure acts on the pressure unit
which actuates the wastegate flap by means of
a linkage. The wastegate flap opens a bypass which
allows some of the exhaust gases to flow past the
turbine wheel to the exhaust system. With this
control system, it is possible to regulate the turbine
speed and set the maximum boost pressure.
332_011
Note
In the event that the control system fails,
the boost pressure will act directly on the
pressure unit and against its spring
pressure. In this way, the maximum boost
pressure is reduced to a base boost
pressure.
Turbocharger divert air valve N249
Charge pressure control
solenoid valve N75
Pressure unit
Wastegate
Vacuum pump
Activated charcoal
filter system solenoid
valve 1 N80
Oil filter module
Charge air cooler
Charge air ducting and boost pressure control
Brake booster servo
Water connection