warning AUDI A4 1998 B5 / 1.G ATW Engine On Board Diagnostic Workshop Manual

01-2

If the ECM recognizes malfunctions that lead to
a worsening of emissions values, it indicates
them by lighting the Malfunction Indicator Lamp
(MIL) -K83- in the instrument cluster. Meaning
of Malfunction Indicator Lamp (MIL) -K83-
Page 01
-3 .

"E-Gas"-relevant malfunctions are also
indicated by the warning lamp for Electronic
Power Control ("EPC warning lamp").
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01-6

Function test of warning lamp

- Switch ignition on.


Exhaust MIL must light up

A- Exhaust MIL does not light up

- Connect VAG1598/31 test box at wiring harness
to Engine Control Module (ECM), do not connect
ECM Page 24
-19
.

- 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:

Repair Manual, Electrical Equipment, Repair
Group 90; Instrument cluster, removing and
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01-9

Safety precautions

If special testing equipment is required during
road test, note the following:

WARNING!

Test equipment must always be secured to
the rear seat and operated from there by a
second person.
If test and measuring equipment is operated
from the passenger seat, the person seated
there could be injured in the event of an
accident involving deployment of the
passenger-side airbag.
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01-11

WARNING!

Observe safety precautions Page 01
-9 .

Note:
The following description only explains
implementation of On Board Diagnostic using
VAG1551 Scan tool. When using the VAS5051
tester, observe instructions in the tester's user
manual. VAG - On Board Diagnostic (OBD)
HELP
1- Rapid data transfer1
)
2- Blink code output1
)

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
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