1999 AUDI A8 ignition

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
ge 5 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

01-10

WARNING!

Observe safety precautions Page 01
-8 .

Note:
The following description only explains
implementation of On Board Diagnostic using
VAG1551 Scan tool.
When using the VAS5051 tester, observe the
tester's instructions for use V.A.G - ON BOARD DIAGNOSTIC
HELP
1 - Rapid data transfer 1)2 - Blink code output 1
)

Indicated on display: 1) Operating modes 1 and 2 are displayed alternately
Note:
If nothing appears in display:
- Perform troubleshooting procedure after "troubleshooting procedure leak
test":
Electrical Wiring Diagrams, Troubleshooting & Component Locations
binder
Depending on desired function Table "Selectable functions", page
Page 01
-14
:
- Switch ignition on.
or
Pa
ge 13 of 19 Motronic, On Board Dia
gnostic
(OBD
)
11/23/2002 htt
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play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU05.01.1

01-14
Selectable functions VAS 5051 vehicle diagnostic, testing and information
system or VAG1551 Scan Tool (ST) Ignition
on,
engine
off Engine running
at idle Vehicle in drive
mode page
Address words
01 Engine electronics Yes Yes Yes Page
01
-9
00 Automatic test sequence Yes Yes Yes Page
01
-11

Functions
01 Check Control Module Versions Yes Yes Yes Page
01
-13

02 Check DTC Memory No Yes Yes Page
01
-15

03 Output Diagnostic Test Mode (DTM) Yes No No Page
01
-56

04 Basic Setting Yes Yes Yes Page
01
-66

05 Erase DTC Memory Yes Yes Yes Page
01
-15

06 End Output Yes Yes Yes Page
01
-17

07 Code Control Module Yes No No Page
01
-71

Pa
ge 18 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