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Contents
24 - Mixture preparation - injection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1 Servicing injection system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.1 General notes on self-diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.2 Safety precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.3 Rules for cleanliness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.4 Procedure to be followed prior to opening high-pressure injection system - take note of the
following: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.5 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.6 Overview - fitting locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.7 Exploded view - intake manifold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
1.8 Exploded view - fuel rail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
1.9 Exploded view - air cleaner / engine cover panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
1.10 Removing and installing engine cover panel with air filter element . . . . . . . . . . . . . . . . . . 16
1.11 Removing and installing intake manifold with fuel rail . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
1.12 Removing and installing injectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
1.13 Checking initial fuel pressure (up to high-pressure pump) . . . . . . . . . . . . . . . . . . . . . . . . . . 26
1.14 Checking fuel pressure and residual pressure (up to high-pressure pump) . . . . . . . . . . . . 28
1.15 Exploded view - high-pressure fuel pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
1.16 Removing and installing high-pressure fuel pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
1.17 Wiring and component check with test box V.A.G 1598/42 . . . . . . . . . . . . . . . . . . . . . . . . 34
1.18 Renewing Motronic control unit J220 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
1.19 Removing and installing Lambda probe G39 and Lambda probe heater Z19 before catalytic
converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
1.20 Removing and installing Lambda probe after catalytic converter G130 and Lambda probe 1
heater, after catalytic converter Z29 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
28 - Ignition system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
1 Checking ignition system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
1.1 General notes on ignition system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
1.2 Safety precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
1.3 Technical data for ignition system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
2 Ignition system - exploded view of components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
3 Removing and installing ignition coils with output stages . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Audi A3 2004 ➤
Direct petrol injection and ignition system (4-cyl. 2.0 ltr. 4-valve turbo) - Edition 11.2005
Contents i
