AUDI A4 1999 B5 / 1.G APB Engine Motronic Syst

01-9

Vehicle diagnostic, testing and
information system VAS5051 or
VAG1551, connecting and selecting
functions


Requirements

Fuses for engine electronics OK
Fuel pump relay OK
Battery voltage at least 11 V
Ground (GND) connection for engine and
transmission OK

- Switch ignition off.

Note:
The Data Link Connector (DLC) is located below the dash, to the left of
the steering column. - Connect vehicle diagnostic, testing and information system VAS5051
with VAS5051/1 diagnostic cable. As an alternative, connect VAG1551
scan tool with VAG1551/3B diagnostic cable.
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11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
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e=re
pair&id=AUDI.B5.FU04.01.1

01-10

WARNING!

When performing a road test and checks, the
vehicle diagnostic, testing and information
system VAS5051 as well as the VAG1551
may be secured only on rear seat, from
where it is to be operated by a second
technician.
Please follow safety precautions Page 24
-1

Note:
Only the procedure for OBD VAG1551 is
described below. For details of how to use the
vehicle diagnostic, testing and information
system VAS5051, please refer to its operating
manual. VAG - On Board Dia
gnostic
HELP
1 - Rapid data transfer*2 - Blink code output*

Indicated on display
* Appears alternately
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pair&id=AUDI.B5.FU04.01.1

01-11

- If no display appears, check diagnostic
cables:

Electrical Wiring Diagrams, Troubleshooting &
Component Locations Depending on the function required:

- Switch ignition on.

or

Start engine Page 01
-6 , table of available
functions.

- Switch on printer with PRINT button (indicator
light in button lights up).

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

Indicated on display:
Rapid data transfer
Q
01 - En
gine Electronics

- Press buttons -0- and -1- to insert "Engine electronics" address word
01.
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p://127.0.0.1:8080/audi/servlet/Dis
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- Press -Q- button to confirm input.
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01-12

Rapid data transfer
HELP
Control module does not answer

If the display shows one of the messages reproduced here, run through
the troubleshooting procedure as described in the Electrical Wiring
Diagrams, Troubleshooting and Component Location binder.
Electrical Wiring Diagrams, Troubleshooting and Component Locations
Rapid data transfer
HELP
K wire not switching to Ground

Rapid data transfer
HELP
K wire not switching to B+

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p://127.0.0.1:8080/audi/servlet/Dis
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pair&id=AUDI.B5.FU04.01.1

01-13

Control module identification (example) 4D0907551.. 2.7L V6/5VT
G 0002..
Codin
g 06711
WSC 06388

The display on VAG1551 will show the control module identification, for
example: 1)
The engine is a so called Biturbo engine, that means the engine is
equipped with two turbo chargers. "Bi" (latin) stand for two. 4D0907551... Engine Control Module (ECM) Part No.
2.7 L Engine displacement
V6 / 5VT Engine configuration
(V6 5-valve Turbo
1)

G or no
display "G" for vehicles with Cruise control system or not 0002ECM Software version Coding
06711 Coding of ECM WSC 06388Dealership code of VAG1551 with which the last
coding was performed
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01-14
If the coding differs from the vehicle version,
then:

- Check coding of engine control module Page
01
-93
, Coding engine control module.

-
Press button.Rapid data transfer
HELP
Select function XX

Indicated on display:
Note:
After pressing the HELP button, an overview of the possible functions is
printed out.
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01-15

Diagnostic Trouble Code (DTC) Memory,
checking and erasing


- Connect vehicle diagnostic, testing and
information system VAS5051 or VAG1551 scan
tool and select "Engine Electronics" by entering
address word 01 Page 01
-9. When doing this
the engine must be idling.
Only if engine does not start:

- Check engine with ignition switched on.

- Switch on printer with PRINT button (indicator
light in button lights up). Rapid data transfer
HELP
Select function XX

Indicated on display
- Operate scan tool according to information on display:
- Press buttons -0- and -2- to select function "Check DTC Memory" and
confirm entry with -Q- button.
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pair&id=AUDI.B5.FU04.01.1

01-16

No DTC reco
gnized

Indicated on display
or -
Press button.
X DTC reco
gnized

Indicated on display
The stored malfunctions will be displayed and printed out in sequence.
Note: - Locate and eliminate printed out malfunctions according to DTC table
Page 01
-19
.
If no malfunction is stored in the DTC memory, do not erase memory,
otherwise readiness code must be generated. If the DTC memory was erased, generate readiness code Page 01
-
105
.
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01-17

-
Press button.Rapid data transfer
HELP
Select function XX

Indicated on display:
Notes: - Press buttons -0- and -5- to select function "DTC Memory" and confirm
entry with -Q- button.
Attention!DTC memor
y was not checked

Indicated on display:
Test sequence has not been followed.
- Check DTC memory.
Under the following conditions the DTC memory will not be erased:
If Ignition was switched off after DTC memory has been checked.A static malfunction has not been eliminated.
Pa
ge 20 of 166 Motronic s
ystem, On Board Dia
gnostic
(OBD
)
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU04.01.1