Audi A8 2010 Workshop 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
with respect to the correctness of information in this document. Copyright by AUDI AG.
Contents
24 - Mixture preparation - injection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1 Safety precautions and rules for cleanliness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.1 General notes on self-diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.2 Safety precautions when using testers and measuring instruments during a road test . . . . 1
1.3 Safety precautions when working on vehicles with start/stop system . . . . . . . . . . . . . . . . 2
1.4 Safety precautions when working on the fuel system . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.5 Safety precautions when working on the injection system . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.6 Reducing pressure in high-pressure section of injection system . . . . . . . . . . . . . . . . . . . . 3
1.7 Checking fuel system for leaks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.8 Checking vacuum system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2 Injection system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1 Test data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2 Overview of fitting locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.3 Air cleaner - exploded view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
2.4 Removing and installing engine cover panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
2.5 Removing and installing air filter element . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
2.6 Removing and installing air cleaner housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
2.7 Intake manifold (bottom section), fuel rail, injector - exploded view . . . . . . . . . . . . . . . . . . 22
2.8 Removing and installing intake air temperature sender G42 / intake manifold pressure sender
G71 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
2.9 Removing and installing throttle valve module J338 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
2.10 Removing and installing regulating flap control unit J808 . . . . . . . . . . . . . . . . . . . . . . . . . . 27
2.11 Removing and installing intake manifold (bottom section) with fuel rail . . . . . . . . . . . . . . . . 27
2.12 Removing and installing injectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
2.13 Checking fuel pressure and residual pressure (up to high-pressure pump) . . . . . . . . . . . . 33
2.14 High-pressure pump - exploded view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
2.15 Removing and installing high-pressure pipe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
2.16 Removing and installing high-pressure pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
2.17 Lambda probes - overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
2.18 Removing and installing Lambda probe G39 and Lambda probe after catalytic converter
G130 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
2.19 Removing and installing Lambda probe 2 G108 and Lambda probe 2 after catalytic converter
G131 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
3 Engine control unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
3.1 Wiring and component check with test box V.A.G 1598/42 . . . . . . . . . . . . . . . . . . . . . . . . 46
3.2 Removing and installing engine control unit J623 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
28 - Ignition system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
1 General notes and safety precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
1.1 General notes on ignition system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
1.2 Safety precautions when working on the injection and ignition system . . . . . . . . . . . . . . . . 50
1.3 Safety precautions when working on vehicles with start/stop system . . . . . . . . . . . . . . . . 51
1.4 Safety precautions when using testers and measuring instruments during a road test . . . . 51
2 Servicing ignition system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
2.1 Test data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
2.2 Ignition system - exploded view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
2.3 Removing and installing ignition coils . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
2.4 Removing and installing knock sensors G61 / G66 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
2.5 Removing and installing Hall senders G40 / G163 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
2.6 Removing and installing engine speed sender G28 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Audi A8 2010 ➤
Simos direct petrol injection and ignition system (6-cyl. 3.0 ltr. TFSI 4-valve) - Edition 12.2011
Contents i

Audi A8 2010 Specifications

General

Brand	Audi
Model	A8 2010
Category	Automobile
Language	English