Page 4 of 8
21-41
Charge air pressure regulation and
secondary air system vacuum control
system
1 -
EVAP canister
2 -
From fuel tank
3 -
Evaporative Emission (EVAP) canister
purge regulator valve -N80-
4 -
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
5 -
Air cleaner
Pa
ge 4 of 8 Vacuum control s
ystem
(en
gine code ATW
)
11/18/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE02.21.2
Page 5 of 8
21-42
6 -
Turbocharger
Check charge air pressure Page 21
-54
7 -
Combination valve for secondary air
injection (AIR)
8 -
Fuel pressure regulator
9 -
To power brake booster
10 -
Check valve
Installation position (light/dark side): Arrow
points in direction of flow, as shown
11 -
Vacuum booster
12 -
To Leak Detection Pump (LDP)
13 -
Vacuum reservoir
Pa
ge 5 of 8 Vacuum control s
ystem
(en
gine code ATW
)
11/18/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE02.21.2
Page 6 of 8
21-43
14 -
Distributor piece
15 -
Check valve
Installation position (light/dark side): Arrow
points in direction of flow, as shown
16 -
Secondary Air Injection (AIR) solenoid
valve -N112-
17 -
Crankcase vent
18 -
Check valve Installation position (light/dark side): Arrow
points in direction of flow, as shown
19 -
To tank Leak Detection Pump (LDP) -
V144-
Pa
ge 6 of 8 Vacuum control s
ystem
(en
gine code ATW
)
11/18/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE02.21.2
Page 7 of 8
21-44
20 -
Check valve
Installation position (light/dark side): Arrow
points in direction of flow, as shown
21 -
Charge air cooler With charge air pressure sensor -G31-
22 -
Throttle valve control module -J338-
23 -
Recirculating valve for turbocharger -
N249- Checking Page 21
-48
24 -
Intake manifold
With Intake Air Temperature (IAT) sensor -
G42-
Pa
ge 7 of 8 Vacuum control s
ystem
(en
gine code ATW
)
11/18/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE02.21.2
