Light AUDI A4 1999 B5 / 1.G EVAP Workshop Manual
Page 26 of 65
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Checking voltage supply (all vehicles)
Note:
Voltage supply to the LDP is via the fuel pump
relay.
Test condition:
Fuse for LDP is OK
- Disconnect connector from LDP.
- Connect voltage tester VAG1527 B as follows:Connector terminal
Measure
3 Engine Ground (GND)
- Briefly operate starter motor.
LED must light up.
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Page 27 of 65
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If LED does not light up:
Electrical Wiring Diagrams, Troubleshooting & Component Locations
If wiring is OK:
Repair Manual, Fuel Injection & Ignition, Repair Group 24 - Check electrical wiring from terminal 3 via fuse for fuel pump relay for
open circuit. - Repair wiring as necessary.
- Check fuel pump relay:
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Page 56 of 65
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EVAP system leak detection circuit,
schematic diagram (vehicles with 1.8 ltr.
turbo engine)
Repair Manual, 1.8 Liter 4-Cyl. 5V Turbo Fuel
Injection & Ignition, Repair Group 24 1 -
Check valve
Location (light/dark side): as shown in
illustration
2 -
EVAP canister purge regulator valve -N80-Location: in engine compartmentChecking
3 -
Bleed line
From EVAP canister purge regulator valve
-N80-
LocationRight side under floor panFront-wheel drive: on floor pan in area of
fuel tank All-wheel drive: on fuel tank in area of fuel
tank
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Page 58 of 65
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10 -
Vacuum supply reservoir
11 -
Check valve
Location (light/dark side): as shown in
illustration
12 -
T - piece Location Fig. 1
13 -
Throttle actuator control module -J338-
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11/18/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
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yp
e=re
pair&id=AUDI.B5.GE04.20.5