ignition AUDI A4 1998 B5 / 1.G AWM Engine On Board Diagnostic Workshop Manual

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
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01-9


Display on VAS5051:
Depending on desired function Table "diagnostic functions", Page 01
-11
:
or
- Switch ignition on.
- Start engine.
- Press selection -1- of vehicle system "01 - Engine electronics".
- Wait until the next indication appears on display.

Display on VAS5051:
1 - Control module identification of Engine Control Module (ECM)
Page 01
-10

2 - Control module identification of immobilizer Page 01
-10
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01-11

-
Click on - button

Display on VAS5051:
1 - Selection of diagnostic functions:
Diagnostic functions
Ignition on,engine
off
Engine running at
idle
Vehicle in drive
mode
page
02 Check DTC Memory No Yes Yes Page 01
-
12

03 Output Diagnostic Test Mode
(DTM) Yes No No Page 01
-
51

04 Basic Setting Yes Yes Yes Page 01
-
66

05 Erase DTC Memory Yes Yes Yes Page 01
-
12

06 End Output Yes Yes Yes Page 01
-
16

07 Code control module Yes No No Page 01
-
71

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