AUDI A4 1999 B5 / 1.G ATW Engine On Board Diagnostic User Guide

01-9

Safety precautions

If special testing equipment is required during
road test, note the following:

WARNING!

Test equipment must always be secured to
the rear seat and operated from there by a
second person.
If test and measuring equipment is operated
from the passenger seat, the person seated
there could be injured in the event of an
accident involving deployment of the
passenger-side airbag.
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01-10

VAS5051 tester or VAG1551 scan tool,
connecting and selecting functions


Test requirements:

Fuses for engine electronics OK

Electrical Wiring Diagrams, Troubleshooting &
Component Locations

Fuel Pump (FP) relay OK; checking Page 24
-53
.

Battery voltage at least 12.7 V
Ground (GND) connections at engine and
transmission OK

Procedure

Note:
Data Link Connector (DLC) is located in front left knee bolster. - Connect VAS5051 tester to vehicle with VAS5051/1 diagnostic wire.
Alternately, VAG1551 Scan Tool (ST) can also be attached using
VAG1551/3A adapter.
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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.
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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)
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Select function XX
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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

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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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01
-65

Pa
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)
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