1996 AUDI A4 AUX

21-28


- Connect auxiliary hose to valve connector marked with an arrow.
- Initiate output Diagnostic Test Mode (DTM) and activate recirculating
valve for turbocharger -N249-.
Output Diagnostic Test Mode Recircul. valve for turbochar
ger -N249-

Display:
If the injector does not click:
If valve does not open or close properly:
The valve should click ... ... and must open and close (check by blowing into the auxiliary
hose).
- Check internal resistance of valve.
- Replace recirculation valve for turbocharger -N249-.
Pa
ge 17 of 34 Char
ge pressure leak test with VAG 1687
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE06.21.2

21-34

Test requirements:

Vehicle diagnostic, testing and information
system VAS 5051 or VAG 1551 Scan Tool
connected.

Test sequence

Note:
The Wastegate Bypass Regulator valve -N75-
and the wiring connections are monitored by the
engine control module.

- Read Diagnostic Trouble Code (DTC) memory
of engine control module.
If a DTC relating to the Wastegate Bypass
Regulator valve -N75 is displayed:

- Disconnect hoses from valve but leave electrical
connector attached.

- Connect auxiliary hose to valve connector marked with an arrow.
- Initiate output Diagnostic Test Mode (DTM) and actuate Wastegate
Bypass Regulator valve -N75-.
Pa
ge 24 of 34 Char
ge pressure leak test with VAG 1687
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE06.21.2

21-35

Output Diagnostic Test Mode -N75- waste
gate b
ypass re
gulator valve

Display
If the injector does not click:
If valve does not open or close properly:
Checking internal resistance
The valve must click ... ... and must open and close (check by blowing into the auxiliary
hose).
- Check internal resistance of valve.
- Replace Wastegate Bypass Regulator valve -N75-.
- Disconnect connector from valve.

If specified value is not attained:
If specified value is attained: - Connect multimeter to injector to measure resistance.
Specified value: 25 to 35
- Replace Wastegate Bypass Regulator valve -N75-.
- Check power supply.
Pa
ge 25 of 34 Char
ge pressure leak test with VAG 1687
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE06.21.2