fuel AUDI A4 1997 B5 / 1.G AEB Engine EVAP System Checking
Page 1 of 12
24-136
Evaporative Emissions
(EVAP) system, checking
CAUTION!
Whenever carrying out work on the fuel
supply and/or fuel injection systems, read
and carefully follow the Cautions, Warnings,
and rules of cleanliness Page 24
-5 .
Note:
Always replace gaskets, O-rings and hose
clamps.
Hose connections must be secured with screw-
type clamps or band clamps.
Pa
ge 1 of 12 Eva
porative Emissions
(EVAP
) system, checkin
g
11/19/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU02.24.4
Page 3 of 12
24-138
Voltage supply, checking
If LED tester does not light: - Disconnect harness connector for LDP -V144-.
- Connect VAG 1527B LED voltage tester between connector terminal 3
(B+) and engine Ground.
- Start engine and run engine at idle.
LED must light up.
- Check fuse for LDP -V144-.
- Check wiring for open circuit between terminal 3 and fuse, according to
wiring diagram. Specified value: max. 0.5 . - Check fuel pump relay and signal to relay Page 24
-81
.
Pa
ge 3 of 12 Eva
porative Emissions
(EVAP
) system, checkin
g
11/19/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU02.24.4
Page 11 of 12
24-143
Checking EVAP canister purge regulator
valve voltage supply
Test conditions
Fuse for EVAP canister purge regulator
valve OK.
- Disconnect harness connector from EVAP
canister purge regulator valve.
If LED test light does not light:
If wiring is OK: - Connect VAG 1527B LED voltage tester between connector terminal 1
and engine Ground.
- Operate starter motor.
Specified value: LED must light up
- Check wiring for open circuit between connector terminal 1 and fuse,
according to wiring diagram. Repair if necessary.
- Check fuel pump relay Page 24
-81
.
Pa
ge 11 of 12 Eva
porative Emissions
(EVAP
) system, checkin
g
11/19/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU02.24.4