ignition AUDI TT 2000 8N / 1.G ATW 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 Malfunction Indicator Lamp (MIL).

Installation location of Malfunction Indicator Lamp (MIL)
The Engine Control Module (ECM) switches on the 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
-16
.
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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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01-12
Depending on desired function Table
"Selectable functions", Page 01
-15
:

- Switch ignition on.
or

- Start engine.

- Press -Print- button to turn on Scan Tool (ST)
printer. Indicator lamp in button must light up.

- Press button 1 to select "Rapid data transfer"
operating mode 1. Rapid data transfer
HELP
Enter address word XX

When indicated on display
Note:
The address word 00 initiates the automatic test sequence, i.e. it results in
a DTC check on all OBD capable systems in the vehicle via rapid data
transfer.
- Press buttons -0- and -1- to select "engine electronics" and press -Q-
button to confirm input.
4B0906018Q
1.8 L R4/5VT
G 0008
Codin
g 07551
WSC 12345

VAG1551 Scan Tool (ST) display indicates control module identification,
e.g.
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01-15
Selectable functions VAS5051 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
-10

00 Automatic test sequence Yes Yes Yes Page
01
-12

Functions
01 Check Control Module Versions Yes Yes Yes Page
01
-14

02 Check DTC Memory No Yes Yes Page
01
-16

03 Output Diagnostic Test Mode (DTM) Yes No No Page
01
-49

04 Basic Setting Yes Yes Yes Page
01
-58

05 Erase DTC Memory Yes Yes Yes Page
01
-16

06 End Output Yes Yes Yes Page
01
-18

07 Code Control Module Yes No No Page
01
-62

08 Read measuring value block Yes Yes Yes Page
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