2000 AUDI A8 Instrument

01-2

If the ECM recognizes malfunctions that lead to
a degradation of emissions values, it indicates
them by lighting the Malfunction Indicator Lamp
(exhaust warning lamp -K83-). Clarification of
this lamp Page 01
-3 .

"E-Gas"-relevant malfunctions are also
indicated in the instrument cluster by the
warning lamp for Electronic Power Control
("EPC warning lamp").
Pa
ge 2 of 19 Motronic, On Board Dia
gnostic
(OBD
)
11/23/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU05.01.1

01-5

Function test of warning lamp

- Switch ignition on.


Warning lamp for On Board Diagnostic
(Malfunction Indicator Lamp -MIL-) must
light up

A - Warning lamp for On Board Diagnostic
(Malfunction Indicator Lamp -MIL-) does not
light up

- Connect VAG1598/31 test box at wiring harness
to ECM, do not connect ECM Page 24
-17
.

- Bridge sockets 1 and 47 of test box.

- Switch ignition on.


Warning lamp must light up.
If warning lamp does not light up:

- Switch ignition off.

- Remove instrument cluster:

Pa
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gnostic
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)
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play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU05.01.1

Repair Manual, Electrical Equipment, Repair
Group 90, Instrument cluster, removing and installing

Pa
ge 6 of 19 Motronic, On Board Dia
gnostic
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)
11/23/2002 htt
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play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU05.01.1

01-6

- Check the following wire connection for open
circuit and short circuit to B+:

Test box
VAG1598/31
Socket
Instrument cluster

Terminal
47 Electrical Wiring Diagrams,
Troubleshooting & Component
Locations binder

- Repair open circuit or short circuit if
necessary.
If wire connection is OK:

- Replace Engine Control Module (ECM) Page
24
-21
.
Pa
ge 7 of 19 Motronic, On Board Dia
gnostic
(OBD
)
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play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU05.01.1

01-7

B - Warning lamp for On Board Diagnostic
(Malfunction Indicator Lamp -MIL-) remains lit
constantly

- Check DTC memory of Engine Control Module
(ECM) Page 01
-15
.
If no DTCs are stored:

- Connect VAG1598/31 test box at wiring harness
to ECM, do not connect ECM Page 24
-17
.

- Remove instrument cluster:

Repair Manual, Electrical Equipment, Repair
Group 90, Instrument cluster, removing and installing


- Check the following wire connection for short
circuit to Ground (GND):

Test box
VAG1598/31
Socket
Instrument cluster

Terminal
47 Electrical Wiring Diagrams,
Pa
ge 8 of 19 Motronic, On Board Dia
gnostic
(OBD
)
11/23/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU05.01.1