fuse AUDI A4 1997 B5 / 1.G AEB ATW Engines Charge Air System With Turbocharger Workshop Manual
Page 7 of 42
21-51
If the specified value is attained:
- Check voltage supply
Checking voltage supply
Note:
Voltage is supplied to the recirculation valve via
the Fuel Pump (FP) relay.
Test requirement
Fuse for recirculation valve OK
- Disconnect harness connector at valve.
- Connect VAG1527B voltage tester as follows:Harness connector
terminal
Measure to
1 Engine Ground (GND)
- Operate starter briefly.
LED must light.
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ger
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11/18/2002 htt
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play?action=Goto&t
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Page 8 of 42
21-52
If LED does not light:
- Check wire connection from terminal 1 to Fuel
Pump (FP) relay via fuse for an open circuit":
Electrical Wiring Diagrams, Troubleshooting &
Component Locations
- Repair open circuit if necessary.
If wire connection is OK:
- Check Fuel Pump (FP) relay:
Repair Manual, 1.8 Liter 4-Cyl. 5V Turbo Fuel
Injection & Ignition, Repair Group 24 If LED lights:
- Check activation:
Checking activation
- Connect VAG1527B voltage tester to connector terminals 1 (B+) and 2.
-
Initiate output Diagnostic Test Mode (DTM) and activate the
Pa
ge 8 of 42 Char
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ystem with turbochar
ger
(en
gine code ATW
)
11/18/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
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pair&id=AUDI.B5.GE02.21.3
Page 22 of 42
21-63
If specified value is not obtained:
- Replace wastegate bypass regulator valve -N75-
.
If the specified value is met:
Checking voltage supply
If LED does not light:
Electrical Wiring Diagrams, Troubleshooting & Component Locations - Connect VAG1527B voltage tester as follows:Harness connector
terminal
Measure to
1 Engine Ground (GND)
- Operate starter briefly.
LED must light.
- Check wire connection from terminal 1 to Fuel Pump (FP) relay via
fuse for open circuit:
- Repair open circuit if necessary.
Pa
ge 22 of 42 Char
ge air s
ystem with turbochar
ger
(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.GE02.21.3