AUDI TT 1998 8N / 1.G ATW Engine Vacuum Diagram Workshop Manual

24-177


Vacuum diagram
1 -
To EVAP canister
2 -
Evaporative Emission (EVAP) canister
purge regulator valve -N80-
3 -
Check-valve for EVAP canister
between EVAP canister and intake
manifold before turbocharger Installation position (light/dark side): Arrow
points in direction of flow, as shown in
figure.
4 -
Air cleaner housing with Mass Air Flow (MAF) sensor -G70-
5 -
Turbocharger
6 -
Combination valve for secondary air
injection (AIR)
Pa
ge 1 of 5 Vacuum dia
gram
11/21/2002 htt
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24-178


7 -
Fuel pressure regulator
8 -
To brake booster
9 -
Check-valve
Between brake booster and intake manifoldInstallation position (light/dark side): Arrow
points in direction of flow, as shown in
figure.
10 -
Vacuum booster
11 -
Check-valve Between brake booster and intake manifoldInstallation position (light/dark side): Arrow
points in direction of flow, as shown in
figure.
Pa
ge 2 of 5 Vacuum dia
gram
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
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24-179


12 -
Vacuum reservoir
Installation location: Under wheel housing
liner in front left wheel housing
13 -
Secondary Air Injection (AIR) solenoid
valve-N112- Installation location: Below intake manifold
14 -
Crankcase ventilation
15 -
Check-valve between EVAP canister and intake
manifold between Leak Detection Pump (LDP) and
intake manifold Installation position (light/dark side): Arrow
points in direction of flow, as shown in
figure.
16 -
to Leak Detection Pump (LDP) -V144-
Pa
ge 3 of 5 Vacuum dia
gram
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU06.24.6

24-180


17 -
Charge air cooler
with charge air pressure sensor -G31-
18 -
Throttle valve control module -J338-
19 -
Recirculating valve for turbocharger-
N249- Installation location: Below intake manifold
20 -
Intake manifold with Intake Air Temperature (IAT) sensor -
G42-
21 -
Vacuum diaphragm for boost pressure
regulation When the combination valve is opened, the
mechanical boost pressure regulation valve
in the turbocharger is opened and
secondary air is thereby channeled past
the turbocharger directly to the catalytic
converter
Pa
ge 4 of 5 Vacuum dia
gram
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU06.24.6

24-181


22 -
Wastegate bypass regulator valve -N75-
23 -
Mechanical recirculation valve
24 -
Pressure control valve for crankshaft
housing ventilation
25 -
Secondary Air Injection (AIR) pump
motor-V101-
Pa
ge 5 of 5 Vacuum dia
gram
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU06.24.6