fuse AUDI A4 1998 B5 / 1.G AWM Engine Charge Pressure Leak Test Workshop Manual
Page 19 of 34
21-30
Checking power supply
Note:
The power supply for the recirculating valve is via
the fuel pump relay.
Test requirements:
Fuse for recirculating valve OK.
Electrical Wiring Diagrams, Troubleshooting &
Component Locations binder
Fuel pump relay OK.
Repair Manual, 1.8 Liter 4
-Cyl. 5V Turbo Fuel
Injection & Ignition, Engine Code(s): AWM, Repair Group 24
- Disconnect wiring connector from valve.
- Connect voltage tester VAG 1527 B as follows:Connector
Measure to
Pa
ge 19 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
Page 21 of 34
21-31
If the LED does not light up:
- Check wiring from contact 1 on connector via
fuse to fuel pump relay for an 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 activate recirculatiing
valve for turbocharger -N249-.
The LED must flash.
Pa
ge 21 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
Page 26 of 34
21-36
Checking power supply
Test requirements:
Fuse for wastegate bypass regulator valve
OK
Electrical Wiring Diagrams, Troubleshooting &
Component Locations binder
Fuel pump relay OK.
Repair Manual, 1.8 Liter 4
-Cyl. 5V Turbo Fuel
Injection & Ignition, Engine Code(s): AWM, Repair Group 24
- Connect voltage tester VAG 1527 B as follows:Connector
contact
Measure to
1 Engine Ground
- Operate starter briefly.
LED must light up.
Pa
ge 26 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
Page 27 of 34
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