instrument cluster AUDI A4 2000 B5 / 1.G AWM 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 exhaust MIL Page 01
-3 .

"E-Gas"-relevant malfunctions are also
indicated by the warning lamp for Electronic
Power Control ("EPC warning lamp") in the
instrument cluster.
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01-3

Malfunction Indicator Lamp (MIL),
significance

If the ECM recognizes malfunctions that lead to a
worsening of emissions values, it indicates them
by lighting the exhaust Malfunction Indicator
Lamp (MIL).

Installation location of exhaust Malfunction Indicator Lamp (MIL)
The Engine Control Module (ECM) switches on the exhaust Malfunction
Indicator Lamp (MIL) after ignition is switched on. Shortly after engine is
started, the exhaust MIL will go out. This requires, first of all, that the
Engine Control Module (ECM) does not detect a malfunction that worsens
the emissions values and, secondly, that activation of the lamp by the
Engine Control Module (ECM) is OK.
If malfunctions that worsen emissions are recognized during operation of
the engine, the ECM switches on the exhaust MIL in instrument cluster.
(These malfunctions are listed in the DTC table). An entry is made in DTC
memory at the same time.
The Malfunction Indicator Lamp (MIL) can blink or remain lit continuously.
DTC memory should be checked in either case Page 01
-12
.
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01-5

Malfunction Indicator Lamp (MIL),
checking


Function test of warning lamp

- Switch ignition on.


Exhaust MIL must light up

- Start engine.

Shortly after engine is started, the
Malfunction Indicator Lamp (MIL) will go out
if there are no malfunctions stored in DTC
memory that relate to the E-gas system

Note:
The switch-on signal for Malfunction Indicator
Lamp (MIL) is transfered from the Engine Control
Module (ECM) to the instrument cluster via CAN-
bus. Check data exchange between Engine
Control Module (ECM) and other CAN capable
control modules Page 24
-178

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