1996 AUDI A6 check

01-2
If a malfunction is no longer present after a
certain time or a long drive, it will be converted to
a sporadic (SP) DTC.
A malfunction will also be converted to sporadic
when the DTC memory is not erased after
repairs.
Malfunctions which are stored in the memory as
sporadic malfunctions, will be displayed as
"sporadic DTCs" when checked by the scan tool
V.A.G 1551. In such cases "SP" appears on the
right of the display. If the printer is switched on,
the print-out will show "sporadic DTC" after the
identification of the malfunction.
If the sporadic DTC does not occur again after 40
cold engine starts and subsequent transmission
warm-up, the malfunction in DTC memory will be
automatically erased.
The possibilities offered by On Board Diagnostic
can only be used with the Vehicle Diagnostic,
Testing and Information System VAS 5051 or the
V.A.G 1551 scan tool (mode 1, rapid data
transfer).
Available functions of Vehicle Diagnostic, Testing
and Information System VAS 5051 or the
V.A.G1551 scan tool page 01
-42
.
Pa
ge 3 of 13 On Board Dia
gnostic
(OBD
), function
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.AT02.01.1

01-4

- The Multi-function Indicator Light (MIL) lights up
after 2 driving cycles (Dcy); check DTC memory
( page 01
-43
and compare with DTC table
page 01
-45
).
If the TCM -J217- malfunctions (e.g. if the power
supply is faulty or the connector becomes
disconnected), the transmission will immediately
switch to "mechanical back-up mode with
inactive control module" and continue to
operate.

Mechanical backup with non-active control
module

- The transmission shifts out of all forward gears
into hydraulic 4th gear. The torque converter
clutch is unlocked (not applied). All solenoid
valves are de-energized.

- Maximum shift pressure is applied to the power-
transmitting elements.

- Reverse gear can be engaged. The shift lock
solenoid is active (in "P" and "N").

- All of the segments transmission range selector lever display are dark.
-
The MIL lights up when the Engine Control Module (ECM) has
recognized a CAN-bus malfunction (missing data exchange between
engine and transmission control modules) (after 2 Dcy); check DTC
Pa
ge 6 of 13 On Board Dia
gnostic
(OBD
), function
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.AT02.01.1

memory of the control module.
- Transmission Control Module (TCM) -J217- does not function at all, i.e.
it cannot be checked via On Board Diagnostic (OBD).
Pa
ge 7 of 13 On Board Dia
gnostic
(OBD
), function
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.AT02.01.1

01-5

Malfunction Indicator Lamp (MIL)
function, checking

If emissions malfunctions are recognized by the
TCM, the Malfunction Indicator Lamp (MIL) will
be switched on.

Location of the MIL: integrated in speedometer in instrument cluster
Notes:
When the MIL is switched on, it will either blink or light continuously. The
DTC memory for the TCM must be checked page 01
-43
.
MIL flashing: there is a malfunction that could damage the Three Way
Catalytic Converter (TWC). In this case, drive only with reduced
power. MIL continuously on: there is a malfunction that degrades emissions.
Check DTC memory of the Engine Control Module (ECM) or the TCM. If there are driveability problems (e.g. a customer complaint) and the
MIL is not on, perform the MIL functional because malfunctions can be
stored that do not switch the MIL on.
Pa
ge 8 of 13 On Board Dia
gnostic
(OBD
), function
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.AT02.01.1

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
.
Pa
ge 9 of 13 On Board Dia
gnostic
(OBD
), function
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.AT02.01.1

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.
Pa
ge 12 of 13 On Board Dia
gnostic
(OBD
), function
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.AT02.01.1

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.
Pa
ge 13 of 13 On Board Dia
gnostic
(OBD
), function
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.AT02.01.1