relay AUDI A4 2000 B5 / 1.G AWM Engine Tank Ventilation Checking Workshop Manual
Page 4 of 6
24-117
Checking voltage supply
Test requirements:
Fuse for the EVAP valve OK.
Electrical Wiring Diagrams, Troubleshooting &
Component Locations
Fuel Pump (FP) relay OK; checking Page 24
-52
.
Note:
Voltage is supplied to the EVAP valve via the
Fuel Pump (FP) relay.
- Disconnect connector at EVAP valve.
- Connect VAG1527B voltage tester as follows:Harness connector
Terminal
Measure to
1 Engine Ground (GND)
- Operate starter briefly (engine can also start).
LED must light up.
Pa
ge 4 of 6 Tank ventilation, checkin
g
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU07.24.3
Page 5 of 6
24-118
If LED does not light up:
- Check wire connection from terminal 1 of
connector to Fuel Pump (FP) relay via fuse for
open circuit:
Electrical Wiring Diagrams, Troubleshooting &
Component Locations
- Repair open circuit if necessary.
If LED lights up:
- Checking activation.
Checking activation
- Connect VAG1527B voltage tester to connector terminals 1 (B+) and 2.
- Initiate output DTM and activate Evaporative Emission (EVAP) canister
purge regulator valve -N80- Page 01
-51
.
LED must blink.
Pa
ge 5 of 6 Tank ventilation, checkin
g
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU07.24.3