fuel pump AUDI A4 1998 B5 / 1.G AHA Engine Multiport Fuel Injection And Ignition System Owner's Manual

24-124

Leak Detection Pump (LDP), checking


Note:
Component locations page 24
-1

Electrical testing

If resistance is NOT OK: - Disconnect harness connector for LDP -V144-.
- Connect multimeter US1119 (Fluke 83 or equivalent) and check
resistance at leak detection pump. Specified values:

Connector terminal 1 to terminal 3: 640-720

Connector terminal 2 to terminal 3: 11.0-21.0
- Replace leak detection pump -V144-.
Pa
ge 161 of 166 Motronic Multi
port Fuel In
jection
(MFI
) and i
gnition s
ystem
11/23/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU03.24.1

24-125

Voltage supply, checking

If LED tester does not light: - Disconnect harness connector for LDP -V144-.
- Connect VAG1527B 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
-95
.
Pa
ge 162 of 166 Motronic Multi
port Fuel In
jection
(MFI
) and i
gnition s
ystem
11/23/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU03.24.1