display AUDI A4 1996 B5 / 1.G AWM Engine Charge Pressure Leak Test Workshop Manual

21-27

Test requirements:

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

Test sequence

Note:
The recirculating valve for turbocharger -N249-
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 recirculating valve for
turbocharger -N249- is displayed:

Note:
The illustration shows bottom view of removed intake line. - Remove hoses of recirculating valve for turbocharger -N249- (-1-). The
electrical connector remains plugged in.
Location: below intake line
Pa
ge 16 of 34 Char
ge pressure leak test with VAG 1687
11/21/2002 htt
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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
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yp
e=re
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21-37
If the LED does not light up:

- Check wiring from contact 1 on connector via
fuse to fuel pump relay for open circuit:

Electrical Wiring Diagrams, Troubleshooting &
Component Locations binder
- Repair open circuit, if necessary
If the LED lights up:

- Check actuation.

Checking actuation

- Connect voltage tester VAG 1527 B to contacts 1 (positive) and 2 of
connector.
- Initiate output Diagnostic Test Mode (DTM) and actuate Wastegate
Bypass Regulator valve -N75-.
Output Diagnostic Test Mode

Display
Pa
ge 27 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

21-40

Test requirements:

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

Test sequence

Note:
The Charge Air Pressure sensor -G31- 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 Charge Air Pressure
sensor -G31- is displayed:

Checking power supply

- Disconnect connector -arrow- on charge pressure sender.
Pa
ge 31 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