2002 Audi S4 Service & Repair Manual Software
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Workshop Manual
Audi A4 1995 ➤
Electrical system, self-diagnosis
Edition 12.2005
Service
Service Department. Technical Information
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
List of Workshop Manual Repair Groups
Repair Group
01 - Self-diagnosis
Technical information should always be available to the foremen and mechanics, because their
careful and constant adherence to the instructions is essential to ensure vehicle road-worthiness and
safety. In addition, the normal basic safety precautions for working on motor vehicles must, as a
matter of course, be observed.
Service
All rights reserved.
No reproduction without prior agreement from publisher.
Copyright © 2015 Audi AG, Ingolstadt 00055005020
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
Contents
01 - Self-diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1 Connecting vehicle diagnostic, testing and information system VAS 5051B . . . . . . . . . . 1
1.1 Safety precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
2 Dash panel insert self-diagnosis up to Model Year 1999 . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1 General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.2 Starting dash panel insert self-diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.3 Interrogating fault memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.4 Fault tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.5 Final control diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.6 Erasing fault memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.7 End of output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.8 Encoding control unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.9 Reading measured value block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2.10 Adaption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
2.11 Adaption channels 01 … 09 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
2.12 Adaption channels 10 … 30 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
2.13 Input values on dash panel insert replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
2.14 Service interval display reset on completion of service without VAS 5051B . . . . . . . . . . . . 40
3 Self-diagnosis of dash panel insert with extended service interval as of Model Year 2000
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
3.1 General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
3.2 Starting dash panel insert self-diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
3.3 Interrogating fault memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
3.4 Fault tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
3.5 Final control diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
3.6 Erasing fault memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
3.7 End of output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
3.8 Encoding control unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
3.9 Reading measured value block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
3.10 Adaption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
3.11 Adaption channels 02 … 09 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
3.12 Adaption channels 18 … 35 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
3.13 Adaption channels 40 … 48 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
3.14 Adaption channels 60 … 62 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
3.15 Input values on dash panel insert replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
3.16 Service interval display reset on completion of service without VAS 5051B . . . . . . . . . . . . 87
4 Immobilizer self-diagnosis - “Immobilizer I” . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
4.1 General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
4.2 Starting immobilizer self-diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
4.3 Interrogating fault memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
4.4 Fault tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
4.5 Erasing fault memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
4.6 End of output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
4.7 Reading measured value block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
4.8 Adaption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
4.9 Establishing PIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
4.10 Matching of vehicle keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
4.11 Procedure in the event of loss of key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
4.12 Matching following replacement of immobilizer control unit J362 or dash panel insert . . . . 105
4.13 Matching following replacement of engine control unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
4.14 Emergency starting function with VAS 5051B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
5 Immobilizer self-diagnosis - “Immobilizer II” (as of week 27/1999) . . . . . . . . . . . . . . . . . . 113
Audi A4 1995 ➤
Electrical system, self-diagnosis - Edition 12.2005
Contents i
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5.1 General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
5.2 Starting immobilizer self-diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
5.3 Interrogating fault memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116
5.4 Fault tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
5.5 Erasing fault memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
5.6 End of output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
5.7 Reading measured value block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
5.8 Adaption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123
5.9 Establishing PIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123
5.10 Matching of vehicle keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124
5.11 Procedure in the event of loss of key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
5.12 Matching following replacement of dash panel insert . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
5.13 Matching following replacement of engine control unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
5.14 Emergency starting function with VAS 5051B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133
6 Immobilizer self-diagnosis - “Immobilizer III” as of week 18/2000 . . . . . . . . . . . . . . . . . . . . 136
6.1 General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
6.2 Starting immobilizer self-diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
6.3 Interrogating fault memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
6.4 Fault tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141
6.5 Erasing fault memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142
6.6 End of output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143
6.7 Reading measured value block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144
6.8 Adaption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146
6.9 Establishing PIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146
6.10 Matching of vehicle keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147
6.11 Procedure in the event of loss of key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152
6.12 Matching following replacement of dash panel insert . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152
6.13 Matching following replacement of engine control unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157
6.14 Matching following replacement of dash panel insert and engine control unit . . . . . . . . . . 161
6.15 Control unit release . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164
7 Cruise control system (CCS) self-diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168
7.1 Checking cruise control system - petrol engines with electronic throttle . . . . . . . . . . . . . . 168
7.2 Checking cruise control system - TDI engines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171
7.3 Activating/deactivating cruise control system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173
8 Acoustic Parking System (APS) self-diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175
8.1 General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175
8.2 Starting parking system self-diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175
8.3 Interrogating fault memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177
8.4 Fault tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178
8.5 Erasing fault memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180
8.6 End of output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181
8.7 Encoding control unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182
8.8 Reading measured value block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183
8.9 Adaption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185
9 Automatic headlight range control self-diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 191
9.1 General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 191
9.2 Starting automatic headlight range control self-diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . 191
9.3 Interrogating fault memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 193
9.4 Fault tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194
9.5 Final control diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195
9.6 Basic setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196
9.7 Erasing fault memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 198
9.8 End of output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 199
9.9 Encoding control unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200
9.10 Reading measured value block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201
Audi A4 1995 ➤
Electrical system, self-diagnosis - Edition 12.2005
ii Contents
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permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
10 Checking data exchange between control units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203
10.1 Checking “two-wire bus system” . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203
Audi A4 1995 ➤
Electrical system, self-diagnosis - Edition 12.2005
Contents iii
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with respect to the correctness of information in this document. Copyright by AUDI AG.
Audi A4 1995 ➤
Electrical system, self-diagnosis - Edition 12.2005
iv Contents
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permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
01 – Self-diagnosis
1 Connecting vehicle diagnostic, test‐
ing and information system -VAS
5051B-
1.1 Safety precautions
Note the following if testers and measuring instruments have to
be used during a test drive:
WARNING
♦ Always attach the testers and measuring instruments to
the rear seat and have them operated from there by a
second person.
♦ If testers and measuring instruments were to be operated
from the front passenger's seat, the person sitting there
could be injured by triggering of the front passenger's air‐
bag in an accident.
Heed the following so as to avoid possible injury and/or the de‐
struction of electrical and electronic components:
♦ Always switch off ignition before disconnecting and connecting
measuring instruments and testers.
♦ Certain tests may lead to a fault being detected by the control
unit and stored. The fault memory should therefore be inter‐
rogated and (if necessary) erased after completing all tests
and performing any repair work.
♦ Always switch off the ignition before connecting or discon‐
necting the battery, as otherwise electronic control units could
be damaged.
Conditions:
• Vehicle power supply OK
• Corresponding system fuses OK ⇒ Current flow diagrams,
Electrical fault finding and Fitting locations
• Battery earth strap and, if fitted, earth strap between battery
and gearbox OK
• Battery voltage min. 12.5 V
• Vehicles with automatic gearbox: Selector lever set to “P” or
“N” and handbrake applied
– Check earth connections for corrosion and damage and repair
if necessary ⇒ Current flow diagrams, Electrical fault finding
and Fitting locations.
Audi A4 1995 ➤
Electrical system, self-diagnosis - Edition 12.2005
1. Connecting vehicle diagnostic, testing and information system VAS 5051B 1
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
Sequence of operations
– Open the rear ashtray and remove the cover for the diagnostic
connector.
– Connect up the vehicle diagnostic, testing and information
system -VAS 5051B- with the diagnostic wire -VAS 5051/1- ,
touch the vehicle self-diagnosis key and select vehicle
system “01 - Engine electronics”. The engine must be idling
when doing so.
WARNING
Heed safety precautions ⇒ page 1 .
Note
If a fault message appears on the display, refer to ⇒ Operating
instructions of vehicle diagnostic, testing and information system
-VAS 5051B- .
– Switch on ignition.
Or
– Start engine.
Display on -VAS 5051B- :
– Touch vehicle self-diagnosis key.
Audi A4 1995 ➤
Electrical system, self-diagnosis - Edition 12.2005
2 Rep. Gr.01 - Self-diagnosis
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permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
Display on -VAS 5051B- :
Note
Touching the function “00 - Interrogating fault memory - Overall
system” in the list -1- implements the automatic test sequence,
i.e. the fault memories of all systems with self-diagnosis capability
in the vehicle are interrogated.
– In the list -1-, touch the required vehicle system, e.g. “17 - Dash
panel insert”.
Audi A4 1995 ➤
Electrical system, self-diagnosis - Edition 12.2005
1. Connecting vehicle diagnostic, testing and information system VAS 5051B 3
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
2 Dash panel insert self-diagnosis up to
Model Year 1999
2.1 General information
Technical features of dash panel insert
♦ Two different dash panel inserts are fitted:
Midline: With Minicheck system
Highline: With driver information system (DIS)
♦ The speedometer contains an LCD display for the mileage
counter, trip recorder and service interval display.
♦ The warning lamps are integrated into the speedometer and
rev counter.
♦ The dash panel insert is controlled by a microprocessor and
is provided with comprehensive self-diagnosis. Any faults oc‐
curring at system components cause fault codes to be stored
in the dash panel insert fault memory. The faults can be es‐
tablished by way of the vehicle diagnostic, testing and infor‐
mation system -VAS 5051B- .
♦ Adaption functions can also be implemented.
“dEF” display in trip recorder
“dEF” appears on the trip recorder display if the control unit in the
dash panel insert detects a fault at the read-only memory. If “dEF”
is displayed:
– Replace the dash panel insert ⇒ Rep. Gr. 90 .
Dash panel insert replacement
♦ The dash panel insert is not to be dismantled.
♦ Warning lamps in the form of bulbs can be replaced separately
⇒ Rep. Gr. 90 .
♦ If necessary, the dash panel insert is to be replaced as part of
the exchange system.
♦ Complete the damage report and return it together with the
dash panel insert.
♦ Always use the original packaging when returning the unit.
♦ On dash panel insert replacement, mileage counter and serv‐
ice interval display adaption can be performed using the ve‐
hicle diagnostic, testing and information system -VAS 5051B-
⇒ page 18 .
Audi A4 1995 ➤
Electrical system, self-diagnosis - Edition 12.2005
4 Rep. Gr.01 - Self-diagnosis
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