display AUDI A4 1996 B5 / 1.G ATW Engine On Board Diagnostic Workshop Manual

01-1


On Board Diagnostic (OBD)

On Board Diagnostic (OBD), technical
data


Equipment

Data is transmitted between the control module
and the VAS5051 tester or VAG1551 Scan Tool
(ST) via operating mode "Rapid Data Transfer".
DTC memory is designed for permanent
memory and is therefore not dependent on
voltage supply.
Display of stored DTCs occurs after initiation of
display mode Page 01
-16
.

DTC memory must be erased after malfunction
is repaired Page 01
-16
.

Important:

Readiness code must be re-generated after
every time DTC memory is erased Page 01
-
73
.
Pa
ge 1 of 19 On Board Dia
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01-11

WARNING!

Observe safety precautions Page 01
-9 .

Note:
The following description only explains
implementation of On Board Diagnostic using
VAG1551 Scan tool. When using the VAS5051
tester, observe instructions in the tester's user
manual. VAG - On Board Diagnostic (OBD)
HELP
1- Rapid data transfer1
)
2- Blink code output1
)

Indicated on display 1) Operating modes 1 and 2 are displayed alternately
Note:
If nothing appears in display:
- Perform troubleshooting procedure after "troubleshooting procedure leak
test":
Electrical Wiring Diagrams, Troubleshooting & Component Locations
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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.
Pa
ge 14 of 19 On Board Dia
gnostic
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)
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01-13

Note:
Control module identification can be printed by
pressing the PRINT key on the VAG1551 scan
tool.

Control module identification (example)

4B0906018Q part number; allocation
Parts Catalog 1.8LEngine displacement R4/5VTInline engine, 4 cylinders / 5
valve turbo "G" i.e. no
indication Vehicle with or without cruise
control system 0008Data version (software
version) of control module Coding 07551 Control module coding WSC 12345 Factory identification of
VAG1551, with which the last
coding was performed

-
Press button.
Rapid data transfer
HELP

Indicated on display (function selection)
Pa
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01-14

Note:

It will be possible to display the control module
identification again after pressing buttons -0-
and -1- to select "Check Control Module
Versions" and confirming with the -Q- button.
Rapid data transfer
HELP
Control module not respondin
g!

- Perform troubleshooting procedure after "troubleshooting procedure leak
test":
Electrical Wiring Diagrams, Troubleshooting & Component Locations
When indicated on display
Rapid data transfer
HELP
K-wire does not switch to Ground

Rapid data transfer
HELP
K-wire does not switch to B+

Rapid data transfer
HELP
Malfunction in communication set-up

Pa
ge 17 of 19 On Board Dia
gnostic
(OBD
)
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yp
e=re
pair&id=AUDI.B5.FU06.01.1