1999 AUDI A6 01V Transmission OBD Functions Workshop Manual

01-6

MIL functional check

- Switch ignition on: MIL must come on.

If the MIL does not come on when the ignition is
switched on (with the engine not running):
Check DTC memory page 01
-43
. If
necessary, check wiring per wiring diagram or
replace light bulb.

- Start engine and let idle: MIL must switch off
after several seconds.

If the MIL does not switch off after the engine is
started: Check DTC memory page 01
-43
.
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01-7

Conditions for recognition of a driving
cycle (Dcy)

A driving cycle (Dcy) is complete when the
ignition is switched on one time, the engine
starts, the engine start is recognized by the
control module, and the ignition is switched off.
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01-8

On Board Diagnostic (OBD), technical
data


Memory

Permanent memory
yes
Data output
Rapid data transfer
Blink code output yes
no
Output Diagnostic Test Mode yes
Basic setting no
Coding control module yes
Read measuring value block yes

Electrical/electronic component locations
Page 01
-11

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01-9
On Board Diagnostic II (OBD II), functions

Note:
The following modes can be selected via address word 33:
Mode
Function
1 Transmit diagnostic data:
Only certain individual test values can be read. Read the the measuring value block by using address word 02,
function 08.
2 Not applicable
3 Check DTC memory: Only emissions-influencing malfunctions are indicated immediately or after two driving cycles (Dcy), depending
on the malfunction, via the corresponding P-codes. Check DTC memory by using address word 02, function 02.
4 Erase DTC memory: DTC memory can be erased, even if it has not previously been read. Erase DTC memory by using address word
02, function 05.
5 Not applicable
6 Not applicable
7 OBD test results, continuously monitored: Emissions-related malfunctions can be read, even if these malfunctions have not existed long enough for the
MIL to be switched on.
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01-10

Mode
Function
8
Not applicable
9 This mode only applies as of model year 2000. The first value indicates the Part No. and the program or data status of the Transmission Control Module (TCM).The second value indicates a checking summation, for instance A357. This value is calculated internally and
can be disregarded.
Note:
There is no further detailed information about OBD in this section.
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