diagram AUDI A4 1997 B5 / 1.G AWM Engine Charge Air Syst

21-3


Connection diagram for charge air control
and vacuum pressure control

1 -
Activated charcoal filter (ACF)
2 -
EVAP Canister Purge Regulator valve -
N80-
3 -
Non return valve for ACF
Between ACF container and intake line in
front of exhaust turbocharger Note position (light side/ dark side) as
shown in Fig; arrow faces in direction of
flow
4 -
Air cleaner With Mass Air Flow (MAF) sensor -G70-
Pa
ge 3 of 17 Char
ge air s
ystem with turbochar
ger, checkin
g
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE06.21.1

21-13
Charge air pressure control malfunctions Malfunction
Possible causes
Charge air pressure below
specified value
Wastegate Bypass Regulator valve -N75- faulty checking, Page 21
-33
Hose connection to Wastegate Bypass Regulator valve -N75- faulty Connection
diagram, Page 21
-3
Wastegate bypass regulator valve in turbocharger stuck openLeak between exhaust turbocharger and intake hose Effects, Page 21
-14
Mechanical air recirculation valve faulty checking, Page 21
-24
Recirculating valve for turbocharger -N249- faulty checking, Page 21
-26
Exhaust turbocharger faulty replacing, Page 21
-51
Charge air pressure above
specified value
1)
Vacuum unit for wastegate bypass regulator valve faulty Replacing exhaust
turbocharger, Page 21
-51

Hose connection to vacuum unit for charge air pressure limiter (above -N75-) leaks
Connection diagram, Page 21
-3
When in closed position wastegate bypass regulator valve in exhaust turbocharger
sticks replacing exhaust turbocharger, Page 21
-51

1) If the charge air pressure is too high the fuel supply will be interrupted in order to protect the engine. This results in misfiring
at high engine speeds.
Pa
ge 14 of 17 Char
ge air s
ystem with turbochar
ger, checkin
g
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE06.21.1