Audi TT 3 User Manual
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
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Service
Workshop Manual
Audi TT 1999 ➤
Motronic injection and ignition system (4-cylinder)
Engine ID
Edition 05.2005
ARY AUM AUQ BVP BVR
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.
Service
List of Workshop Manual Repair GroupsList of Workshop Manual
Repair GroupsList of Workshop Manual Repair Groups
Re pa ir G ro up
01 - Self-diagnosis
24 - Mixture preparation - injection
28 - Ignition system
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.
All rights reserved.
No reproduction without prior agreement from publisher.
Copyright © 2010 Audi AG, Ingolstadt A0357085920
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.
Audi TT 1999 ➤
Motronic injection and ignition system (4-cylinder) - Edition 05.2005
Contents
01 - Self-diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1 Self-diagnosis of Motronic system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.1 Technical data of self-diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.2 Safety precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.3 Connecting vehicle diagnostic, testing and information system VAS 5051 A . . . . . . . . . . 2
2 Interrogating fault memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1 Interrogating fault memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2 Fault tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.3 Fault tables for faults 16395 / P0011 to 17608 / P1200 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.4 Fault tables for faults 17621 / P1231 to 19534 / P3078 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3 Final control diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4 Basic setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
5 Erasing fault memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
6 Ending output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
7 Coding control unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
8 Reading measured value block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
9 Readiness code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
9.1 Reading out readiness code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
9.2 Generating readiness code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
24 - Mixture preparation - injection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
1 Servicing Motronic injection system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
1.1 Safety precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
1.2 Rules for cleanliness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
1.3 Overview of fitting locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
1.4 Dismantling and assembling air cleaner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
1.5 Removing and installing air filter element . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
1.6 Removing and installing air mass meter G70 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
1.7 Wiring and component check with adapter cable, 121-pin V.A.G 1598/31 (test box) . . . . 58
1.8 Procedure following interruption of voltage supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
1.9 Removing and installing engine control unit without protective housing . . . . . . . . . . . . . . 59
1.10 Removing and installing engine control unit with protective housing . . . . . . . . . . . . . . . . . . 61
1.11 Exhaust emissions warning lamp K83 in instrument cluster . . . . . . . . . . . . . . . . . . . . . . . . 63
1.12 Checking exhaust emissions warning lamp K83 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
1.13 Checking idling speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
1.14 Checking system pressure, fuel pressure regulator and residual pressure . . . . . . . . . . . . 67
1.15 Checking injectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
1.16 Dismantling and assembling fuel rail with injectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
1.17 Removing and installing injectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
1.18 Checking injection quantity and spray pattern of injectors; checking for leaks . . . . . . . . . . 75
1.19 Checking fuel pump relay J17 and activation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
1.20 Checking air mass meter G70 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
1.21 Checking intake system for leaks (unmetered air) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
2 Checking Lambda control function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
2.1 Checking Lambda probe and Lambda control before catalytic converter . . . . . . . . . . . . . . 86
2.2 Checking ageing of Lambda probe before catalytic converter . . . . . . . . . . . . . . . . . . . . . . 90
2.3 Checking Lambda probe heating Z19 for Lambda probe before catalytic converter . . . . . . 93
2.4 Checking Lambda probe and Lambda control after catalytic converter . . . . . . . . . . . . . . . . 95
2.5 Checking Lambda probe heating Z29 for Lambda probe after catalytic converter . . . . . . . . 101
2.6 Removing and installing Lambda probe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
3 Checking fuel tank breather system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
Contents i
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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.
Audi TT 1999 ➤
Motronic injection and ignition system (4-cylinder) - Edition 05.2005
3.1 Checking solenoid valve 1 for activated charcoal filter N80 . . . . . . . . . . . . . . . . . . . . . . . . 105
4 Checking electronic engine power control (electronic throttle) . . . . . . . . . . . . . . . . . . . . . . 108
4.1 Operation of electronic throttle system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
4.2 Electronic power control fault lamp K132 in instrument cluster . . . . . . . . . . . . . . . . . . . . . . 108
4.3 Checking electronic power control fault lamp K132 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
4.4 Checking throttle valve module J338 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
4.5 Performing adaption of throttle valve module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
4.6 Checking angle senders for throttle valve drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
4.7 Checking accelerator position senders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116
4.8 Adapting kickdown function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
4.9 Checking brake light switch and brake pedal switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
4.10 Checking clutch pedal switch F36 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
5 Checking auxiliary signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130
5.1 Checking engine speed signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130
5.2 Checking road speed signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
5.3 Checking air conditioner compressor cut-out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133
5.4 Checking power assisted steering pressure switch F88 . . . . . . . . . . . . . . . . . . . . . . . . . . 135
5.5 Checking crash signal wire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
5.6 Checking fuel consumption signal for on-board computer . . . . . . . . . . . . . . . . . . . . . . . . . . 140
5.7 Checking tank level signal wire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140
6 CAN bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141
6.1 Checking CAN bus wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141
7 Vacuum system layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146
28 - Ignition system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148
1 Checking ignition system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148
1.1 Safety precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148
1.2 Checking ignition coils with output stages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149
1.3 Checking Motronic current supply relay J271 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152
1.4 Checking intake air temperature sender G42 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157
1.5 Checking engine speed sender G28 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159
1.6 Checking coolant temperature sender G62 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162
1.7 Checking voltage supply of engine control unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165
1.8 Checking knock control limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166
1.9 Checking knock sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168
1.10 Checking Hall sender G163 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170
1.11 Checking misfiring detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173
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.
Motronic injection and ignition system (4-cylinder) - Edition 05.2005
01 – Self-diagnosis
1 Self-diagnosis of Motronic system
Note
Certain tests may lead to a fault being detected by the control unit
and stored in the memory. The fault memory must therefore be
interrogated and if necessary erased on completion of all tests
and repair work. The readiness code must then be generated af‐
ter erasing the fault memory ⇒ page 37 .
1.1 Technical data of self-diagnosis
♦ Data are transmitted between engine control unit and vehicle
diagnostic, testing and information system -VAS 5051 A- in
“self-diagnosis” mode.
♦ The fault memory is a non-volatile memory and therefore does
not depend on the power supply.
♦ Faults related to the “electronic throttle” are additionally indi‐
cated by the electronic power control fault lamp -K132- (“EPC
lamp”) in the instrument cluster.
♦ If the engine control unit detects faults which result in deteri‐
oration of emission levels, these are indicated by activation of
the exhaust emissions warning lamp -K83- in the instrument
cluster. For operation of the exhaust emissions warning lamp
-K83- , refer to ⇒ page 63 .
Audi TT 1999 ➤
1. Self-diagnosis of Motronic system 1
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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.
Audi TT 1999 ➤
Motronic injection and ignition system (4-cylinder) - Edition 05.2005
1.2 Safety precautions
Note the following if testers and measuring instruments have to
be used during a road test:
WARNING
♦ To avoid any risk of accident, observe the following pre‐
cautions when using test instruments while road testing
the vehicle:
Audi TT Coupé:
♦ To read measured value blocks, use only the vehicle di‐
agnostic, testing and information system -VAS 5051 A- or
the vehicle diagnostic and information system VAS 5052- . Test equipment must always be secured on
the rear seat and operated from that position by a second
person.
♦ Due to the limited space, slide the front passenger's seat
forwards as far as it will go and (without pulling the release
lever) incline the backrest as far forwards as possible by
turning the adjuster knob. Do not operate the release lever
to tilt the backrest forward.
Audi TT Roadster:
♦ In the Audi TT Roadster, only use the vehicle diagnostic
and information system -VAS 5052- with the passenger's
airbag deactivated.
♦ Deactivate the front passenger's airbag by means of the
key switch in the glove box or via the self-diagnosis func‐
tion ⇒ Body, self-diagnosis; Rep. Gr. 01 .
♦ Reactivate front passenger's airbag on completion of
work.
Note the following to avoid possible injury and/or the destruction
of electrical and electronic components:
♦ Always switch off ignition before disconnecting and connecting
measuring equipment and testers.
♦ Always switch off the ignition before connecting or discon‐
necting the battery, otherwise the engine control unit may be
damaged.
1.3 Connecting vehicle diagnostic, testing and information system -VAS 5051 A-
Procedure
• Fuses for engine electronics okay ⇒ Current flow diagrams,
Electrical fault finding and Fitting locations.
• Fuel pump relay OK; checking ⇒ page 77 .
• Battery voltage at least 12.5 V.
• Earth connections on engine and gearbox OK
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.
Motronic injection and ignition system (4-cylinder) - Edition 05.2005
– With ignition switched off, connect up vehicle diagnostic, test‐
ing and information system -VAS 5051 A- with diagnosis lead
-VAS 5051 A/1- to diagnosis connection.
WARNING
Make sure to observe the safety precautions ⇒ page 2 .
Depending on the function required ⇒ Table “Diagnosis functions”
⇒ page 4 :
– Switch on ignition.
or
– Start engine.
Display on -VAS 5051 A- :
– Press the vehicle self-diagnosis key.
Audi TT 1999 ➤
Display on -VAS 5051 A- :
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.
– From list -1- select vehicle system “01 Engine electronics”.
– Wait until next readout appears in the display.
Display on -VAS 5051 A- :
1 - Engine control unit identification
2 - Immobilizer control unit identification
Engine control unit identification (example)
01 - Engine electronics Vehicle system
1. Self-diagnosis of Motronic system 3
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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.
Audi TT 1999 ➤
Motronic injection and ignition system (4-cylinder) - Edition 05.2005
Engine control unit identification (example)
06A906032.. Part no.; assignment ⇒ Parts catalogue
1.8 ltr. 1) R4/5VT 2) G 3) 0003
4)
Engine capacity
2)
In-line engine, 4-cylinder/5-valve turbo
3)
♦ G = Cruise control system activated
1)
♦ No display = No cruise control system fitted or system not activated
4)
Data level (software version) of control unit
Code 11500 Control unit coding (checking ⇒ page 31 )
Workshop code 12345 Workshop code of -VAS 5051 A- which was used to perform the last cod‐
ing
Immobilizer control unit identification (example)
TRUZZZ8NZ11018983 1) AUZ5Z0Y9122017
2)
1)
17-position vehicle identification No. (chassis num‐
ber)
2)
14-position immobilizer identification number
– Press the → key.
Display on -VAS 5051 A- :
1 - Selection of diagnostic functions:
The following diagnosis functions shown in the display -1- are
available:
Diagnosis functions Page Conditions
02 Interrogate fault memory ⇒ page 6
Ignition on, en‐
gine not running
1)
no
Engine idling Vehicle being
driven
yes yes
03 Final control diagnosis ⇒ page 23 yes no no
04 Basic setting ⇒ page 27 yes yes yes
05 Erase fault memory ⇒ page 29 yes yes yes
06 End output ⇒ page 30 yes yes yes
07 Code control unit ⇒ page 31 yes no no
08 Read measured value block ⇒ page 33 yes yes yes
1)
•
If the engine does not start, turn the engine over for at least 5 seconds using the starter. After doing
this, do not switch off the ignition.
All other functions displayed cannot be selected or can be ignored
in this case.
4 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.
Motronic injection and ignition system (4-cylinder) - Edition 05.2005
Fault messages on -VAS 5051 A-
If a fault message appears on the display, refer to ⇒ Operating
instructions of vehicle diagnostic, testing and information system
-VAS 5051 A- .
If display zone -1- shows “Vehicle system not available”:
– Check:
♦ Voltage supply to diagnostic connection ⇒ Current flow dia‐
grams, Electrical fault finding and Fitting locations
♦ Wiring between diagnostic connection and engine control unit
⇒ Current flow diagrams, Electrical fault finding and Fitting lo‐
cations.
Audi TT 1999 ➤
1. Self-diagnosis of Motronic system 5
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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.
Audi TT 1999 ➤
Motronic injection and ignition system (4-cylinder) - Edition 05.2005
2 Interrogating fault memory
2.1 Interrogating fault memory
– Connect vehicle diagnostic, testing and information system -
VAS 5051 A- ⇒ page 2 and select vehicle system “01 - Engine
electronics” from list. When doing this, the engine must be
running at idling speed.
Note
If the engine does not start, turn the engine over for at least 5
seconds using the starter. After doing this, do not switch off the
ignition.
Display on -VAS 5051 A- :
– From list -1-, select diagnosis function “02 - Interrogate fault
memory”.
Display on -VAS 5051 A- :
-1- Content of fault memory No faults detected
or
X faults detected
-2- Fault Fault code
Fault location
Type of fault
A - If faults are detected:
– Print out information on screen or self-diagnosis log.
– Terminate function “02 - Interrogate fault memory” by touching
← key.
6 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.
Motronic injection and ignition system (4-cylinder) - Edition 05.2005
Display on -VAS 5051 A- :
– Rectify fault(s) according to fault tables ⇒ page 8 .
– From list -1-, select diagnosis function “02 - Interrogate fault
memory” again and erase fault memory ⇒ page 29 .
– Select diagnosis function “06 - End output” from the menu
-1- ⇒ page 30 .
B - If no faults are detected:
– Terminate function “02 - Interrogate fault memory” by touching
← key.
– Select diagnostic function “06 - End output” from list
⇒ page 30 .
Note
♦
If no faults have been stored in the fault memory, do not erase
the fault memory unnecessarily otherwise the readiness code
will be reset.
♦
If the fault memory has been erased, the readiness code must
be generated again ⇒ page 37 .
Audi TT 1999 ➤
2. Interrogating fault memory 7
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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.
Audi TT 1999 ➤
Motronic injection and ignition system (4-cylinder) - Edition 05.2005
2.2 Fault tables
Note
♦
If faults occur in the monitored sensors or components, these
are stored in the fault memory together with an indication of
the type of fault.
♦
Faults related to the “electronic throttle” are additionally indi‐
cated by the electronic power control fault lamp -K132- (“EPC
lamp”) in the instrument cluster. Notes on electronic throttle
system ⇒ page 108 .
♦
Faults which cause a deterioration in emission levels are in‐
dicated by the exhaust emissions warning lamp -K83- in the
instrument cluster. Notes on exhaust emissions warning lamp
⇒ page 63 .
♦
The fault table is sorted according to the 5-digit fault code in
the left-hand column and the P code.
♦
If a fault is stored in the fault memory and then does not occur
again during the next 40 engine warm-up cycles, the fault will
be automatically erased.
♦
Sporadic faults (temporary faults) are marked “sporadic” on
the display. The word “sporadic” means “intermittent” or “oc‐
curring at irregular intervals”.
♦
The components shown to be defective by the -VAS 5051should not be replaced immediately. Start by using the current
flow diagram to check the wiring and connectors to these com‐
ponents. Also test the earth connections using the current flow
diagram. This is particularly important in the case of “sporadic”
faults.
♦
All adaption values in the control unit are erased if the multipin connectors at the engine control unit are unplugged or the
battery is disconnected. The contents of the fault memory will
remain intact. The next time the engine is started the idling
may be rough at first. In this case, allow the engine to run at
idle for several minutes until the adaption process has been
completed.
♦
If the fault memory has been erased ⇒ page 29 , the readi‐
ness code must be generated again ⇒ page 37 .
2.3 Fault tables for faults 16395 / P0011 to 17608 / P1200
Display on -VAS 5051 A- Explanatory notes Fault remedy
16395 / P0011
Bank 1 camshaft timing control
Specification not attained
16396 / P0012
Bank 1 camshaft timing control
Specification not attained
16485 / P0101
Air mass meter -G70Implausible signal
16486 / P0102
Air mass meter -G70Signal too small
16487 / P0103
Air mass meter -G70Signal too large
♦ If this fault occurs within 3 con‐
secutive driving cycles (engine
operation for at least 5 sec‐
onds), the engine control unit
switches on the exhaust emis‐
sions warning lamp in the instru‐
ment cluster ⇒ page 63
♦ If this fault occurs within 3 con‐
secutive driving cycles (engine
operation for at least 5 sec‐
onds), the engine control unit
switches on the exhaust emis‐
sions warning lamp in the instru‐
ment cluster ⇒ page 63
– Check ⇒ Rep. Gr. 15
– Check air mass meter
⇒ page 80
8 Rep. Gr.01 - Self-diagnosis
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.
Audi TT 1999 ➤
Motronic injection and ignition system (4-cylinder) - Edition 05.2005
Display on -VAS 5051 A- Explanatory notes Fault remedy
16490 / P0106
Intake manif.press./air press ⇒ G71- / -F96Implausible signal
♦ The intake manifold pressure is
determined by the charge air
pressure sender -G31- (instead
of -G71- displayed); the atmos‐
– Check charge air pressure
sender -G31- ⇒ Rep. Gr. 21
pheric pressure is determined
by the altitude sender -F96- (in
the engine control unit)
♦ If this fault occurs within 3 con‐
secutive driving cycles (engine
operation for at least 5 sec‐
onds), the engine control unit
switches on the exhaust emis‐
sions warning lamp in the instru‐
ment cluster ⇒ page 63
16496 / P0112
Intake air temperature sender G42Signal too small
16497 / P0113
Intake air temperature sender G42Signal too large
16500 / P0116
Coolant temperature sender -G62Implausible signal
16501 / P0117
Coolant temperature sender -G62Signal too small
16502 / P0118
Coolant temperature sender -G62Signal too large
16514 / P0130
Bank 1, probe 1
Electrical fault in current circuit
16515 / P0131
Bank 1, probe 1
Voltage too low
16516 / P0132
Bank 1, probe 1
Voltage too high
16517 / P0133
Bank 1, probe 1
Signal too slow
16518 / P0134
Bank 1, probe 1
No activity
16519 / P0135
Bank 1, probe 1
Electrical fault in heating element
circuit
♦ If this fault occurs within 3 con‐
secutive driving cycles (engine
operation for at least 5 sec‐
onds), the engine control unit
switches on the exhaust emis‐
sions warning lamp in the instru‐
ment cluster ⇒ page 63
♦ If this fault occurs within 3 con‐
secutive driving cycles (engine
operation for at least 5 sec‐
onds), the engine control unit
switches on the exhaust emis‐
sions warning lamp in the instru‐
ment cluster ⇒ page 63
♦ If this fault occurs within 3 con‐
secutive driving cycles (engine
operation for at least 5 sec‐
onds), the engine control unit
switches on the exhaust emis‐
sions warning lamp in the instru‐
ment cluster ⇒ page 63
– Check intake air temperature
sender ⇒ page 157
– Check coolant temperature
sender ⇒ page 162
– Check Lambda probe and
Lambda control before catalytic
converter ⇒ page 86
2. Interrogating fault memory 9
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.
Audi TT 1999 ➤
Motronic injection and ignition system (4-cylinder) - Edition 05.2005
Display on -VAS 5051 A- Explanatory notes Fault remedy
16520 / P0136
Bank 1, probe 2
Electrical fault in current circuit
16521 / P0137
Bank 1, probe 2
Voltage too low
♦ If this fault occurs within 3 con‐
secutive driving cycles (engine
operation for at least 5 sec‐
onds), the engine control unit
switches on the exhaust emis‐
sions warning lamp in the instru‐
ment cluster ⇒ page 63
– Check Lambda probe and
Lambda control after catalytic
converter ⇒ page 95
16522 / P0138
Bank 1, probe 2
Voltage too high
16523 / P0139
Bank 1, probe 2
Signal too slow
16524 / P0140
Bank 1, probe 2
No activity
16620 / P0236
Charge pressure sender -G31Implausible signal
16621 / P0237
Charge pressure sender -G31Signal too small
♦ If this fault occurs within 3 con‐
secutive driving cycles (engine
operation for at least 5 sec‐
onds), the engine control unit
switches on the exhaust emis‐
sions warning lamp in the instru‐
ment cluster ⇒ page 63
– Check charge air pressure
sender⇒ Rep. Gr. 21
16622 / P0238
Charge pressure sender -G31Signal too large
16684 / P0300
Misfiring recognised
16685 / P0301
Cyl. 1 Misfiring recognised
16686 / P0302
Cyl. 2 Misfiring recognised
16687 / P0303
Cyl. 3 Misfiring recognised
♦ If this fault occurs within 3 con‐
secutive driving cycles (engine
operation for at least 5 sec‐
onds), the engine control unit
switches on the exhaust emis‐
sions warning lamp in the instru‐
ment cluster ⇒ page 63
– Check fuel pressure
⇒ page 67
– Check injectors ⇒ page 70
– Check spark plugs and ignition
cables with connectors
– Check ignition coils with output
stages ⇒ page 149
16688 / P0304
Cyl. 4 Misfiring recognised
– Check misfiring detection
⇒ page 173
16705 / P0321
Engine speed sender -G28Implausible signal
16706 / P0322
Engine speed sender -G28No signal
10 Rep. Gr.01 - Self-diagnosis
♦ If this fault occurs within 3 con‐
secutive driving cycles (engine
operation for at least 5 sec‐
onds), the engine control unit
switches on the exhaust emis‐
sions warning lamp in the instru‐
ment cluster ⇒ page 63
♦ This fault causes the engine
control unit to activate the EPC
lamp in the instrument cluster
⇒ page 108
– Put fuel in fuel tank
– Check engine speed sender
⇒ page 159
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.
Audi TT 1999 ➤
Motronic injection and ignition system (4-cylinder) - Edition 05.2005
Display on -VAS 5051 A- Explanatory notes Fault remedy
16711 / P0327
Knock sensor 1 -G61Signal too small
16712 / P0328
Knock sensor 1 -G61Signal too large
♦ If this fault occurs within 3 con‐
secutive driving cycles (engine
operation for at least 5 sec‐
onds), the engine control unit
switches on the exhaust emis‐
sions warning lamp in the instru‐
ment cluster ⇒ page 63
– Check for corrosion in connec‐
tion between knock sensor and
wiring harness
– Check knock sensor
⇒ page 168
16716 / P0332
Knock sensor 2 -G66Signal too small
16717 / P0333
Knock sensor 2 -G66Signal too large
16725 / P0341
Camshaft pos. sensor ⇒ sender G40Implausible signal
16726 / P0342
Camshaft pos. sensor ⇒ sender G40Signal too small
16727 / P0343
Camshaft pos. sensor ⇒ sender -
♦ If this fault occurs within 3 con‐
secutive driving cycles (engine
operation for at least 5 sec‐
onds), the engine control unit
switches on the exhaust emis‐
sions warning lamp in the instru‐
ment cluster ⇒ page 63
♦ The Hall sender is referred to as
-G163- in the current flow dia‐
grams.
– Check Hall sender -G163-
⇒ page 170
G40Signal too large
16795 / P0411
Secondary air system
Through-flow defective
♦ If this fault occurs within 3 con‐
secutive driving cycles (engine
operation for at least 5 sec‐
onds), the engine control unit
– Check hoses (secondary air in‐
let valve); check intake system
for leaks (unmetered air)
⇒ page 83
switches on the exhaust emis‐
sions warning lamp in the instru‐
ment cluster ⇒ page 63
– Check secondary air system ⇒
Rep. Gr. 26
16804 / P0420
Bank 1, catalytic converter system
Efficiency too low
16806 / P0422
Bank 1, main catalytic converter
Efficiency too low
16825 / P0441
Tank breathing system
Flow rate faulty
16885 / P0501
Vehicle speed signal
Implausible signal
♦ If this fault occurs within 3 con‐
secutive driving cycles (engine
operation for at least 5 sec‐
onds), the engine control unit
switches on the exhaust emis‐
sions warning lamp in the instru‐
ment cluster ⇒ page 63
♦ If this fault occurs within 3 con‐
secutive driving cycles (engine
operation for at least 5 sec‐
onds), the engine control unit
switches on the exhaust emis‐
sions warning lamp in the instru‐
ment cluster ⇒ page 63
♦ If this fault occurs within 3 con‐
secutive driving cycles (engine
operation for at least 5 sec‐
onds), the engine control unit
switches on the exhaust emis‐
sions warning lamp in the instru‐
ment cluster ⇒ page 63
– Generate readiness code
⇒ page 37 . If the same fault is
displayed again, renew catalytic
converter ⇒ Rep. Gr. 26
– Check solenoid valve 1 for acti‐
vated charcoal filter -N80-
⇒ page 105
– Check vehicle speed signal
⇒ page 131
2. Interrogating fault memory 11
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.
Audi TT 1999 ➤
Motronic injection and ignition system (4-cylinder) - Edition 05.2005
Display on -VAS 5051 A- Explanatory notes Fault remedy
16890 / P0506
Idling speed control
Revs below specification
16891 / P0507
Idling speed control
Revs above specification
♦ If this fault occurs within 3 con‐
secutive driving cycles (engine
operation for at least 5 sec‐
onds), the engine control unit
switches on the exhaust emis‐
sions warning lamp in the instru‐
ment cluster ⇒ page 63
– Check throttle valve module -
J338- ⇒ page 109
– Check hoses (secondary air in‐
let valve); check intake system
for leaks (unmetered air)
⇒ page 83
16944 / P0560
Voltage supply
Implausible signal
16946 / P0562
Voltage supply
Voltage too low
16947 / P0563
Voltage supply
Voltage too high
16955 / P0571
Brake light switch -FImplausible signal
16985 / P0601
Control unit defective
16988 / P0604
Control unit defective
16989 / P0605
Control unit defective
16990 / P0606
Control unit defective
17069 / P0685
Main relay ⇒ -J271Open circuit
17070 / P0686
Main relay ⇒ -J271Short to earth
17071 / P0687
Main relay ⇒ -J271Short to positive
17072 / P0688
Main relay, load circuit ⇒ -J271Open circuit
17510 / P1102
Bank 1, probe 1, heating element
circuit
Short to positive
♦ In addition to the brake light
switch -F- , the brake pedal
switch -F47- is also monitored
♦ If this fault occurs within 3 con‐
secutive driving cycles (engine
operation for at least 5 sec‐
onds), the engine control unit
switches on the exhaust emis‐
sions warning lamp in the instru‐
ment cluster ⇒ page 63
♦ If this fault occurs within 3 con‐
secutive driving cycles (engine
operation for at least 5 sec‐
onds), the engine control unit
switches on the exhaust emis‐
sions warning lamp in the instru‐
ment cluster ⇒ page 63
♦ If this fault occurs within 3 con‐
secutive driving cycles (engine
operation for at least 5 sec‐
onds), the engine control unit
switches on the exhaust emis‐
sions warning lamp in the instru‐
ment cluster ⇒ page 63
– Check voltage supply of engine
control unit ⇒ page 165
– Check brake light switch and
brake pedal switch ⇒ page 121
– Renew engine control unit
⇒ “1.9 Removing and installing
engine control unit without pro‐
tective housing”, page 59 or
⇒ “1.10 Removing and installing
engine control unit with protec‐
tive housing”, page 61
– Check Motronic current supply
relay -J271- ⇒ page 152
– Check Lambda probe heating
before catalytic converter
⇒ page 93
17511 / P1103
Bank 1, probe 2, heating element
circuit
Performance too low
17513 / P1105
Bank 1, probe 2, heating element
circuit
Short to positive
12 Rep. Gr.01 - Self-diagnosis
♦ If this fault occurs within 3 con‐
secutive driving cycles (engine
operation for at least 5 sec‐
onds), the engine control unit
switches on the exhaust emis‐
sions warning lamp in the instru‐
ment cluster ⇒ page 63
– Check Lambda probe heating
after catalytic converter
⇒ page 101
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.
Audi TT 1999 ➤
Motronic injection and ignition system (4-cylinder) - Edition 05.2005
Display on -VAS 5051 A- Explanatory notes Fault remedy
17519 / P1111
Lambda control (bank 1)
– Check Lambda control before
catalytic converter ⇒ page 86
System too lean
17520 / P1112
Lambda control (bank 1)
System too rich
17521 / P1113
Bank 1, probe 1
Internal resistance too high
– Start by checking for contact re‐
sistance in signal wires
⇒ page 90 ; if there is no con‐
tact resistance: renew Lambda
probe
17522 / P1114
Bank 1, probe 2
Internal resistance too high
♦ If this fault occurs within 3 con‐
secutive driving cycles (engine
operation for at least 5 sec‐
onds), the engine control unit
switches on the exhaust emis‐
– Start by checking for contact re‐
sistance in signal wires
⇒ page 100 ; if there is no con‐
tact resistance: renew Lambda
probe
sions warning lamp in the instru‐
ment cluster ⇒ page 63
17523 / P1115
Bank 1, probe 1, heating element
circuit
Short to earth
17524 / P1116
Bank 1, probe 1, heating element
circuit
Open circuit
17525 / P1117
Bank 1, probe 2, heating element
circuit
Short to earth
17526 / P1118
Bank 1, probe 2, heating element
circuit
Open circuit
17535 / P1127
Bank 1, mixture adaption (mult.)
System too rich
17536 / P1128
Bank 1, mixture adaption (mult.)
System too lean
♦ If this fault occurs within 3 con‐
secutive driving cycles (engine
operation for at least 5 sec‐
onds), the engine control unit
switches on the exhaust emis‐
sions warning lamp in the instru‐
ment cluster ⇒ page 63
♦ If this fault occurs within 3 con‐
secutive driving cycles (engine
operation for at least 5 sec‐
onds), the engine control unit
switches on the exhaust emis‐
sions warning lamp in the instru‐
ment cluster ⇒ page 63
♦ “mult.” (= multiplicative) indi‐
cates that the fault takes effect
over the entire engine speed
and load range
– Check Lambda probe heating
before catalytic converter
⇒ page 93
– Check Lambda probe heating
after catalytic converter
⇒ page 101
– Perform road test (fuel in oil)
– Check fuel system pressure
⇒ page 67
– Check air mass meter
⇒ page 80
– Check intake system for leaks
(unmetered air) ⇒ page 83
– Check Lambda probe before
catalytic converter ⇒ page 86
– Check Lambda probe after cat‐
alytic converter ⇒ page 95
– Check injectors ⇒ page 70
2. Interrogating fault memory 13
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.
Audi TT 1999 ➤
Motronic injection and ignition system (4-cylinder) - Edition 05.2005
Display on -VAS 5051 A- Explanatory notes Fault remedy
17544 / P1136
Bank 1, mixture adaption (add.)
System too lean
17545 / P1137
Bank 1, mixture adaption (add.)
System too rich
♦ “add.” = additive, i.e. the fault
only occurs at idling speed
– Perform road test (fuel in oil)
– Check fuel system pressure
⇒ page 67
– Check air mass meter -G70-
⇒ page 80
– Check intake system for leaks
(unmetered air) ⇒ page 83
– Check Lambda probe after cat‐
alytic converter ⇒ page 95
– Check solenoid valve 1 for acti‐
vated charcoal filter -N80-
⇒ page 105
17551 / P1143
Load determination
Level exceeded
♦ If this fault occurs within 3 con‐
secutive driving cycles (engine
operation for at least 5 sec‐
onds), the engine control unit
switches on the exhaust emis‐
– Check air mass meter -G70-
⇒ page 80
– Check throttle valve module -
J338- ⇒ page 109
sions warning lamp in the instru‐
ment cluster ⇒ page 63
17557 / P1149
Lambda control bank 1
Implausible control value
17579 / P1171
Angle sens. 2 for throt. valve drive G188Implausible signal
17580 / P1172
Angle sens. 2 for throt. valve drive G188Signal too low
17581 / P1173
Angle sens. 2 for throt. valve drive G188Signal too high
17584 / P1176
Bank 1, Lambda corr. after catalytic
converter
Control limit reached
♦ If this fault occurs within 3 con‐
secutive driving cycles (engine
operation for at least 5 sec‐
onds), the engine control unit
switches on the exhaust emis‐
sions warning lamp in the instru‐
ment cluster ⇒ page 63
♦ This fault causes the engine
control unit to activate the EPC
lamp in the instrument cluster
⇒ page 108
♦ If this fault occurs within 3 con‐
secutive driving cycles (engine
operation for at least 5 sec‐
onds), the engine control unit
switches on the exhaust emis‐
sions warning lamp in the instru‐
ment cluster ⇒ page 63
– Check Lambda probe learnt val‐
ues and Lambda control
⇒ page 88
– Check fuel system pressure
⇒ page 67
– Check intake system for leaks
(unmetered air) ⇒ page 83
– Check angle sender for throttle
valve drive ⇒ page 112
– Check ageing of Lambda probe
before catalytic converter
⇒ page 90
– Check Lambda probe and
Lambda control after catalytic
converter ⇒ page 95
17606 / P1198
Bank 1, probe 2, heating element
circuit
Electrical fault
17608 / P1200
Air recirculation valve for turbo‐
charger -N249Mechanical fault
14 Rep. Gr.01 - Self-diagnosis
– Check Lambda probe heating
after catalytic converter
⇒ page 101
– Check vacuum system for leaks
– Check air recirculation valve for
turbocharger -N249- ⇒ Rep. Gr.
21
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.
Audi TT 1999 ➤
Motronic injection and ignition system (4-cylinder) - Edition 05.2005
2.4 Fault tables for faults 17621 / P1231 to 19534 / P3078
Display on -VAS 5051 A- Explanatory notes Fault remedy
17621 / P1213
Injector Cyl. 1 -N30Short to Positive
17622 / P1214
Injector Cyl. 2 -N31Short to Positive
17623 / P1215
Injector Cyl. 3 -N32- Short to Posi‐
tive
17624 / P1216
Injector Cyl. 4 -N33Short to Positive
17633 / P1225
Injector Cyl. 1 -N30Short to Earth
17634 / P1226
Injector Cyl. 2 -N31Short to Earth
17635 / P1227
Injector Cyl. 3 -N32Short to Earth
17636 / P1228
Injector Cyl. 4 -N33Short to Earth
17645 / P1237
Injector Cyl. 1 -N30Open circuit
17646 / P1238
Injector Cyl. 2 -N31Open circuit
17647 / P1239
Injector Cyl. 3 -N32Open circuit
17648 / P1240
Injector Cyl. 4 -N33Open circuit
17658 / P1250
Fuel status too low
♦ If this fault occurs within 3 con‐
secutive driving cycles (engine
operation for at least 5 sec‐
onds), the engine control unit
switches on the exhaust emis‐
sions warning lamp in the instru‐
ment cluster ⇒ page 63
♦ The fault “fuel status too low” is
stored in conjunction with misfir‐
ing or faults relating to Lambda
control if there is or has been in‐
sufficient fuel in the tank; the
fault remains static in the fault
memory and is not set to spora‐
dic even if (for example) the ve‐
hicle has been re-fuelled in the
meantime
– Check injectors ⇒ page 70
– Fault resulting from earlier prob‐
lem ⇒ “Explanatory notes”
– Fill fuel tank and erase fault
memory
– Interrogate fault memory of in‐
strument cluster ⇒ Electrical
system, self-diagnosis; Rep.
Gr. 01
2. Interrogating fault memory 15
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.
Audi TT 1999 ➤
Motronic injection and ignition system (4-cylinder) - Edition 05.2005
Display on -VAS 5051 A- Explanatory notes Fault remedy
17695 / P1287
Air recirc. valve for turbocharger N249Open circuit
17696 / P1288
Air recirc. valve for turbocharger N249-
♦ If this fault occurs within 3 con‐
secutive driving cycles (engine
operation for at least 5 sec‐
onds), the engine control unit
switches on the exhaust emis‐
sions warning lamp in the instru‐
ment cluster ⇒ page 63
– Check air recirculation valve for
turbocharger ⇒ Rep. Gr. 21
Short to positive
17697 / P1289
Air recirc. valve for turbocharger N249Short to earth
17704 / P1296
– Check ⇒ Rep. Gr. 19
Fault in cooling system
17705 / P1297
– Check ⇒ Rep. Gr. 21
Turbocharger/throttle valve con‐
nection
Drop in pressure
17733 / P1325
Knock control Cylinder 1
– Check knock control
⇒ page 166
Control limit reached
17734 / P1326
Knock control Cylinder 2
Control limit reached
17735 / P1327
Knock control Cylinder 3
Control limit reached
17736 / P1328
Knock control Cylinder 4
Control limit reached
17743 / P1335
Engine torque monitoring 2
Control limit surpassed
♦ If this fault occurs within 3 con‐
secutive driving cycles (engine
operation for at least 5 sec‐
– Major leak; check intake system
for leaks (unmetered air)
⇒ page 83
onds), the engine control unit
switches on the exhaust emis‐
sions warning lamp in the instru‐
– Check intake air temperature
sender -G42- ⇒ page 157
ment cluster ⇒ page 63
– Check air mass meter -G70-
⇒ page 80
– Check coolant temperature
sender -G62- ⇒ page 162
17744 / P1336
♦ This fault causes the engine
control unit to activate the EPC
lamp in the instrument cluster
⇒ page 108
Engine torque monitoring
Control limit surpassed
17748 / P1340
Camshaft pos./crankshaft pos.
sens.
Wrong allocation
♦ If this fault occurs within 3 con‐
secutive driving cycles (engine
operation for at least 5 sec‐
onds), the engine control unit
switches on the exhaust emis‐
– Unscrew Hall sender and check
proper installation of rotor ring at
camshaft. (If incorrectly instal‐
led, the retainer tab will be
squashed on tightening the bolt)
sions warning lamp in the instru‐
ment cluster ⇒ page 63
– Also check valve timing ⇒ Rep.
Gr. 13
16 Rep. Gr.01 - Self-diagnosis
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.
Audi TT 1999 ➤
Motronic injection and ignition system (4-cylinder) - Edition 05.2005
Display on -VAS 5051 A- Explanatory notes Fault remedy
17763 / P1355
Ignition circuit, cylinder 1
Open circuit
17764 / P1356
Ignition circuit, cylinder 1
Short to Positive
♦ If this fault occurs within 3 con‐
secutive driving cycles (engine
operation for at least 5 sec‐
onds), the engine control unit
switches on the exhaust emis‐
sions warning lamp in the instru‐
ment cluster ⇒ page 63
– Check ignition coils with output
stages ⇒ page 149
17765 / P1357
Ignition circuit, cylinder 1
Short to Earth
17766 / P1358
Ignition circuit, cylinder 2
Open circuit
17767 / P1359
Ignition circuit, cylinder 2
Short to Positive
17768 / P1360
Ignition circuit, cylinder 2
Short to Earth
17769 / P1361
Ignition circuit, cylinder 3
Open circuit
17770 / P1362
Ignition circuit, cylinder 3
Short to Positive
17771 / P1363
Ignition circuit, cylinder 3
Short to Earth
17772 / P1364
Ignition circuit, cylinder 4
Open circuit
17773 / P1365
Ignition circuit, cylinder 4
Short to Positive
17774 / P1366
Ignition circuit, cylinder 4
Short to Earth
17794 / P1386
Control unit defective
17795 / P1387
Control unit defective
♦ If this fault occurs within 3 con‐
secutive driving cycles (engine
operation for at least 5 sec‐
onds), the engine control unit
switches on the exhaust emis‐
sions warning lamp in the instru‐
ment cluster ⇒ page 63
– Renew engine control unit
⇒ “1.9 Removing and installing
engine control unit without pro‐
tective housing”, page 59 or
⇒ “1.10 Removing and installing
engine control unit with protec‐
tive housing”, page 61
17796 / P1388
Control unit defective
♦ If this fault occurs within 3 con‐
secutive driving cycles (engine
operation for at least 5 sec‐
onds), the engine control unit
switches on the exhaust emis‐
sions warning lamp in the instru‐
ment cluster ⇒ page 63
♦ This fault causes the engine
control unit to activate the EPC
lamp in the instrument cluster
⇒ page 108
2. Interrogating fault memory 17
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.
Audi TT 1999 ➤
Motronic injection and ignition system (4-cylinder) - Edition 05.2005
Display on -VAS 5051 A- Explanatory notes Fault remedy
17818 / P1410
Tank breathing valve -N80Short to positive
♦ If this fault occurs within 3 con‐
secutive driving cycles (engine
operation for at least 5 sec‐
– Check solenoid valve 1 for acti‐
vated charcoal filter -N80-
⇒ page 105
onds), the engine control unit
switches on the exhaust emis‐
sions warning lamp in the instru‐
ment cluster ⇒ page 63
17829 / P1421
Secondary air inlet valve -N112Short to earth
17830 / P1422
Secondary air inlet valve -N112Short to positive
17832 / P1424
Bank 1, Secondary air system
Leak recognised
17833 / P1425
Tank breathing valve -N80Short to earth
17834 / P1426
Tank breathing valve -N80Open circuit
17835 / P1427
Activation, vacuum pump for
brakes
Short to positive
17836 / P1428
Activation, vacuum pump for
brakes
Short to positive
17837 / P1429
Activation, vacuum pump for
brakes
Open circuit
17840 / P1432
Secondary air inlet valve -N112Open circuit
17841 / P1433
Relay for secondary air pump J229Open circuit
17842 / P1434
Relay for secondary air pump J229Short to Positive
17843 / P1435
Relay for secondary air pump J229Short to earth
17909 / P1501
Fuel pump relay -J17Short to earth
17910 / P1502
Fuel pump relay -J17Short to positive
♦ If this fault occurs within 3 con‐
secutive driving cycles (engine
operation for at least 5 sec‐
onds), the engine control unit
switches on the exhaust emis‐
sions warning lamp in the instru‐
ment cluster ⇒ page 63
♦ If this fault occurs within 3 con‐
secutive driving cycles (engine
operation for at least 5 sec‐
onds), the engine control unit
switches on the exhaust emis‐
sions warning lamp in the instru‐
ment cluster ⇒ page 63
♦ If this fault occurs within 3 con‐
secutive driving cycles (engine
operation for at least 5 sec‐
onds), the engine control unit
switches on the exhaust emis‐
sions warning lamp in the instru‐
ment cluster ⇒ page 63
♦ If this fault occurs within 3 con‐
secutive driving cycles (engine
operation for at least 5 sec‐
onds), the engine control unit
switches on the exhaust emis‐
sions warning lamp in the instru‐
ment cluster ⇒ page 63
– Check secondary air inlet valve
-N112- ⇒ Rep. Gr. 26
– Check hoses and components
of secondary air system ⇒ Rep.
Gr. 26
– Check solenoid valve 1 for acti‐
vated charcoal filter -N80-
⇒ page 105
– Check brake vacuum pump ⇒
Rep. Gr. 47
– Check secondary air inlet valve
-N112- ⇒ Rep. Gr. 26
– Check secondary air pump relay
-J229- ⇒ Rep. Gr. 26
– Check fuel pump relay
⇒ page 77
18 Rep. Gr.01 - Self-diagnosis
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.
Audi TT 1999 ➤
Motronic injection and ignition system (4-cylinder) - Edition 05.2005
Display on -VAS 5051 A- Explanatory notes Fault remedy
17927 / P1519
Bank 1, camshaft timing control
Faulty
♦ If this fault occurs within 3 con‐
secutive driving cycles (engine
operation for at least 5 sec‐
– Check ⇒ Rep. Gr. 15
onds), the engine control unit
switches on the exhaust emis‐
sions warning lamp in the instru‐
ment cluster ⇒ page 63
17931 / P1523
Crash signal from airbag control
unit
Implausible signal
17937 / P1529
Variable valve timing
Short to positive
17938 / P1530
Variable valve timing
Short to earth
17939 / P1531
Variable valve timing
Open circuit
17947 / P1539
Clutch pedal switch -F36Implausible signal
17949 / P1541
Fuel pump relay -J17Open circuit
♦ This fault is stored if the corre‐
sponding signal is received from
the airbag control unit
♦ If this fault occurs within 3 con‐
secutive driving cycles (engine
operation for at least 5 sec‐
onds), the engine control unit
switches on the exhaust emis‐
sions warning lamp in the instru‐
ment cluster ⇒ page 63
♦ If this fault occurs within 3 con‐
secutive driving cycles (engine
operation for at least 5 sec‐
onds), the engine control unit
switches on the exhaust emis‐
sions warning lamp in the instru‐
ment cluster ⇒ page 63
♦ If this fault occurs within 3 con‐
secutive driving cycles (engine
operation for at least 5 sec‐
onds), the engine control unit
switches on the exhaust emis‐
sions warning lamp in the instru‐
ment cluster ⇒ page 63
– Check ⇒ Body, self-diagnosis;
Rep. Gr. 01
– Check ⇒ Rep. Gr. 15
– Check clutch pedal switch
⇒ page 125
– Check fuel pump relay
⇒ page 77
17950 / P1542
Angle sender for throt. val. drive G187Implausible signal
17951 / P1543
Angle sender for throt. val. drive G187Signal too low
17952 / P1544
Angle sender for throt. val. drive G187Signal too high
17953 / P1545
Throttle valve control
Faulty
♦ If this fault occurs within 3 con‐
secutive driving cycles (engine
operation for at least 5 sec‐
onds), the engine control unit
switches on the exhaust emis‐
sions warning lamp in the instru‐
ment cluster ⇒ page 63
♦ This fault causes the engine
control unit to activate the EPC
lamp in the instrument cluster
⇒ page 108
♦ If this fault occurs within 3 con‐
secutive driving cycles (engine
operation for at least 5 sec‐
onds), the engine control unit
switches on the exhaust emis‐
sions warning lamp in the instru‐
ment cluster ⇒ page 63
♦ This fault causes the engine
control unit to activate the EPC
lamp in the instrument cluster
⇒ page 108
– Check angle sender for throttle
valve drive ⇒ page 112
– Check throttle valve module -
J338- ⇒ page 109
2. Interrogating fault memory 19
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.
Audi TT 1999 ➤
Motronic injection and ignition system (4-cylinder) - Edition 05.2005
Display on -VAS 5051 A- Explanatory notes Fault remedy
17954 / P1546
– Check ⇒ Rep. Gr. 21
Charge press. control solenoid
valve -N75Short to positive
17955 / P1547
Charge press. control solenoid
valve -N75Short to earth
17956 / P1548
Charge press. control solenoid
valve -N75Open circuit
17958 / P1550
Charge pressure
Control difference
17963 / P1555
Maximum charge pressure sur‐
passed
17964 / P1556
Charge pressure control
Regulating limit not reached
17965 / P1557
Charge pressure control
Regulating limit surpassed
17966 / P1558
Throttle valve drive -G186Fault in electrical circuit
♦ If this fault occurs within 3 con‐
secutive driving cycles (engine
operation for at least 5 sec‐
– Check throttle valve module -
J338- ⇒ page 109
onds), the engine control unit
switches on the exhaust emis‐
sions warning lamp in the instru‐
ment cluster ⇒ page 63
♦ This fault causes the engine
control unit to activate the EPC
lamp in the instrument cluster
⇒ page 108
17967 / P1559
Throttle valve module -J338Fault in basic setting
17968 / P1560
Maximum engine revs
surpassed
17972 / P1564
Throttle valve module -J338Low voltage in basic setting
17973 / P1565
Throttle valve module -J338Lower stop not reached
17976 / P1568
Throttle valve module -J338Mechanical fault
♦ If this fault occurs within 3 con‐
– Perform adaption ⇒ page 110
secutive driving cycles (engine
operation for at least 5 sec‐
onds), the engine control unit
switches on the exhaust emis‐
sions warning lamp in the instru‐
ment cluster ⇒ page 63
♦ Engine has been overrevved – Repair mechanical damage
– Charge battery and repeat basic
setting
♦ If this fault occurs within 3 con‐
secutive driving cycles (engine
– Check throttle valve module
⇒ page 109
operation for at least 5 sec‐
onds), the engine control unit
switches on the exhaust emis‐
sions warning lamp in the instru‐
ment cluster ⇒ page 63
♦ This fault causes the engine
control unit to activate the EPC
lamp in the instrument cluster
⇒ page 108
20 Rep. Gr.01 - Self-diagnosis
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.
Audi TT 1999 ➤
Motronic injection and ignition system (4-cylinder) - Edition 05.2005
Display on -VAS 5051 A- Explanatory notes Fault remedy
17977 / P1569
CCS switch -E45-
– Check ⇒ Electrical system, self-
diagnosis; Rep. Gr. 01
Implausible signal
17978 / P1570
Engine control unit
blocked
– Adapt electronic immobilizer to
engine control unit ⇒ Electrical
system, self-diagnosis; Rep.
Gr. 01
17987 / P1579
Throttle valve module -J338Adaption not started
– Perform adaption of throttle
valve module in accordance
with test requirements
⇒ page 110
18010 / P1602
Voltage supply term. 30
– Check voltage supply of engine
control unit ⇒ page 165
Voltage too low
18011 / P1603
Control unit defective
♦ If this fault occurs within 3 con‐
secutive driving cycles (engine
operation for at least 5 sec‐
onds), the engine control unit
switches on the exhaust emis‐
sions warning lamp in the instru‐
ment cluster ⇒ page 63
– Renew engine control unit
⇒ “1.9 Removing and installing
engine control unit without pro‐
tective housing”, page 59 or
⇒ “1.10 Removing and installing
engine control unit with protec‐
tive housing”, page 61
18012 / P1604
Control unit defective
18017 / P1609
Crash switch-off triggered
(crash triggered)
18018 / P1610
Control unit defective
18020 / P1612
Engine control unit wrong coding
♦ If this fault occurs within 3 con‐
secutive driving cycles (engine
operation for at least 5 sec‐
onds), the engine control unit
switches on the exhaust emis‐
sions warning lamp in the instru‐
ment cluster ⇒ page 63
♦ This fault causes the engine
control unit to activate the EPC
lamp in the instrument cluster
⇒ page 108
♦ This fault is stored in the event
of a corresponding signal from
the airbag control unit (also dur‐
ing final control diagnosis of air‐
bag system)
♦ If this fault occurs within 3 con‐
secutive driving cycles (engine
operation for at least 5 sec‐
onds), the engine control unit
switches on the exhaust emis‐
sions warning lamp in the instru‐
ment cluster ⇒ page 63
– Check ⇒ Body, self-diagnosis;
Rep. Gr. 01
– After completing final control di‐
agnosis of airbag system, erase
fault memory of engine control
unit ⇒ page 29
– Renew engine control unit
⇒ “1.9 Removing and installing
engine control unit without pro‐
tective housing”, page 59 or
⇒ “1.10 Removing and installing
engine control unit with protec‐
tive housing”, page 61
– Code engine control unit
⇒ page 31
2. Interrogating fault memory 21
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.
Audi TT 1999 ➤
Motronic injection and ignition system (4-cylinder) - Edition 05.2005
Display on -VAS 5051 A- Explanatory notes Fault remedy
18038 / P1630
Accelerator position sender -G79Signal too low
18039 / P1631
Accelerator position sender -G79Signal too high
18041 / P1633
Accelerator position sender 2 G185Signal too low
18042 / P1634
♦ If this fault occurs within 3 con‐
secutive driving cycles (engine
operation for at least 5 sec‐
onds), the engine control unit
switches on the exhaust emis‐
sions warning lamp in the instru‐
ment cluster ⇒ page 63
♦ This fault causes the engine
control unit to activate the EPC
lamp in the instrument cluster
⇒ page 108
– Check accelerator position
sender ⇒ page 116
Accelerator position sender 2 G185Signal too high
18047 / P1639
Accelerator position sender 1/2 G79- + -G185Implausible signal
18048 / P1640
Control unit defective
♦ If this fault occurs within 3 con‐
secutive driving cycles (engine
operation for at least 5 sec‐
onds), the engine control unit
switches on the exhaust emis‐
sions warning lamp in the instru‐
ment cluster ⇒ page 63
– Renew engine control unit
⇒ “1.9 Removing and installing
engine control unit without pro‐
tective housing”, page 59 or
⇒ “1.10 Removing and installing
engine control unit with protec‐
tive housing”, page 61
18056 / P1648
Drive train data bus
defective
18057 / P1649
Drive train data bus
Message from ABS control unit
missing
18058 / P1650
Drive train data bus
Message from instrument cluster
missing
18062 / P1654
Please interrogate fault memory of
instrument cluster
18090 / P1682
Drive train data bus
Implausible message from ABS
control unit
18261 / P1853
Drive train data bus
Implausible message from ABS
control unit
♦ If this fault occurs within 3 con‐
secutive driving cycles (engine
operation for at least 5 sec‐
onds), the engine control unit
switches on the exhaust emis‐
sions warning lamp in the instru‐
ment cluster ⇒ page 63
– Check CAN bus wiring
⇒ page 141
– Interrogate fault memory ⇒
Electrical system, self-diagno‐
sis; Rep. Gr. 01
– Check CAN bus wiring
⇒ page 141
22 Rep. Gr.01 - Self-diagnosis
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.
Motronic injection and ignition system (4-cylinder) - Edition 05.2005
3 Final control diagnosis
Note
♦
Final control diagnosis can only be performed when engine is
not running and ignition is switched on.
♦
The electric fuel pump runs continuously throughout the final
control diagnosis.
♦
During final control diagnosis, the individual control elements
(except for injectors) are operated for about one minute in turn
unless the next control element is selected by pressing the
→
key.
♦
The control elements can be checked either by listening for
audible clicks, etc. or by touching the component.
♦
The final control diagnosis is terminated if the engine is started
or if an engine speed pulse is detected.
♦
Before restarting the final control diagnosis the engine must
be started and the ignition must be switched off and on again.
Audi TT 1999 ➤
Activation sequence
1. Activated charcoal filter solenoid valve 1 -N80-
2. Secondary air inlet valve -N112-
3. Secondary air pump relay -J299-
4. Solenoid valve for charge pressure control -N75-
5. Variable valve timing
6. Turbocharger air recirculation valve -N249-
7. Injector, cylinder 1 -N30-
8. Injector, cylinder 3 -N32-
9. Injector, cylinder 4 -N33-
10. Injector, cylinder 2 -N31-
11. Brake vacuum pump - only for vehicles with automatic gear‐
box
Procedure
• Fuses for engine electronics okay ⇒ Current flow diagrams,
Electrical fault finding and Fitting locations.
– Connect vehicle diagnostic, testing and information system -
VAS 5051 A- ⇒ page 2 and select vehicle system “01 - Engine
electronics”. When doing this the ignition must be switched on.
Display on -VAS 5051 A- :
– From menu -1- select diagnosis function “03 - Final control
diagnosis”.
Note
The fuel pump relay -J17- should pick up and the fuel pump
should run. There will be a clearly audible fuel flow at the fuel
pressure regulator. If the fuel pump does not run, check activation
⇒ page 78 .
3. Final control diagnosis 23
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.
Audi TT 1999 ➤
Motronic injection and ignition system (4-cylinder) - Edition 05.2005
Activating solenoid valve 1 for activated charcoal filter -N80- (tank
breather valve)
Display on -VAS 5051 A- :
A - 1st control element in test
1 - Fuel tank breather valve -N80-
• The valve is activated (clicks) intermittently for 1 minute unless
the next control element is selected beforehand by touching
the → key.
If the valve is not activated (does not click), check activated char‐
coal filter system solenoid valve 1 -N80- ⇒ page 105 .
Activating secondary air inlet valve -N112-
– Press the → key.
Display on -VAS 5051 A- :
A - 2nd control element in test
2 - Secondary air inlet valve -N112-
• The valve is activated (clicks) intermittently for 1 minute unless
the next control element is selected beforehand by touching
the → key.
If the valve is not activated (does not click) ⇒ Rep. Gr. 26 .
Activating secondary air pump relay -J299-
– Press the → key.
Display on -VAS 5051 A- :
A - 3rd control element in test
3 - Secondary air pump relay -J299-
• The secondary air pump relay -J299- switches the secondary
air pump motor -V101- on and off intermittently for about 1
minute, or until the → key is pressed to advance the pro‐
gramme to the next control element.
If the motor is not activated (does not run intermittently), check
secondary air pump relay -J299- ⇒ Rep. Gr. 26 .
Activating charge pressure control solenoid valve -N75-
– Press the → key.
Display on -VAS 5051 A- :
A - 4th control element in test
4 - Solenoid valve for charge pressure control -N75-
• The valve is activated (clicks) intermittently for 1 minute unless
the next control element is selected beforehand by touching
the → key.
If the valve is not activated (does not click) ⇒ Rep. Gr. 21 .
24 Rep. Gr.01 - Self-diagnosis
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.
Motronic injection and ignition system (4-cylinder) - Edition 05.2005
Activating inlet camshaft control valve 1 -N205-
– Press the → key.
Display on -VAS 5051 A- :
A - 5th control element in test
5 - Variable valve timing
• The valve is activated (clicks) intermittently for 1 minute unless
the next control element is selected beforehand by touching
the → key.
If the valve is not activated (does not click) ⇒ Rep. Gr. 15 .
Activating turbocharger air recirculation valve -N249-
– Press the → key.
Display on -VAS 5051 A- :
A - 6th control element in test
6 - Turbocharger air recirculation valve -N249-
• The valve is activated (clicks) intermittently for 1 minute unless
the next control element is selected beforehand by touching
the → key.
Audi TT 1999 ➤
If the valve is not activated (does not click) ⇒ Rep. Gr. 21 .
Activating injectors
Note
The injectors are activated in firing order sequence: Cyl. 1, Cyl.
3, Cyl. 4, Cyl. 2.
– Press the → key.
Display on -VAS 5051 A- :
A - 7th control element in test
7 - Injector, cylinder 1 -N30-
– Press the → key.
• The injector should click 5 times when you press the → key.
– All injectors are checked consecutively in this manner.
If one of the injectors is not activated (does not click), check in‐
jectors ⇒ page 70 .
– Touch → key following activation of last injector (cylinder 2).
3. Final control diagnosis 25
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.
Audi TT 1999 ➤
Motronic injection and ignition system (4-cylinder) - Edition 05.2005
Activating brake vacuum pump - only for vehicles with automatic
gearbox
Display on -VAS 5051 A- :
A - 11th control element in test
11 - Brake vacuum pump
• The electrical vacuum pump is activated for about 10 seconds
or until the → key is pressed to terminate the final control di‐
agnosis.
If the pump is not activated ⇒ Rep. Gr. 47 .
– Press the → key.
All models:
Display on -VAS 5051 A- :
A - Control element test is ended
– Press the ← key to exit from function “03 - Final control diag‐
nosis”.
Note
To repeat final control diagnosis, the engine must be started and
the ignition switched off and on again.
26 Rep. Gr.01 - Self-diagnosis
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