Audi A3 2004 User Manual download pdf (Page 6)

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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.

To avoid any risk of injuries to persons and/or damage to the fuel

injection and ignition system, always observe the following safety

precautions.

♦ If the battery is not disconnected, fuse No. 27 for fuel pump

control unit -J538- must be removed as a precautionary mea‐

sure before opening the fuel system, because the fuel pump

will otherwise be activated by the contact switch on the driver's

door.

♦ Persons wearing a cardiac pacemaker must at all times main‐

tain a safe distance from high-voltage components such as the

ignition system and gas-discharge headlights.

♦ Do not open any fuel line connections while the engine is run‐

ning.

♦ Always switch off the ignition before connecting or discon‐

necting injection or ignition system wiring or tester cables.

♦ If engine is to be operated at cranking speed without it starting

(e.g. compression test), unplug connectors from ignition coils

and remove fuse for electric fuel pump.

♦ 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 the tests

and any repair work that may be required.

♦ If the fault memory has been erased, you must generate the

readiness code again.

♦ Always switch off the ignition before cleaning the engine.

♦ Always switch off the ignition before connecting or discon‐

necting the battery, otherwise the engine control unit may be

damaged.

♦ If the engine has to be operated at the starting speed without

actually starting (e.g. to test compression pressure), detach

the four connectors from the ignition coils using assembly tool

-T40039- → Chapter (page 43). Also remove fuse 27 from

fuel pump control unit -J538- .

Note

♦

Removing fuse 27 will interrupt the voltage supply for the fuel

pump control unit -J538- .

1.3 Rules for cleanliness

When working on the fuel supply/injection system, pay careful at‐

tention to the following “6 rules”:

♦ Thoroughly clean all unions and the adjacent areas before

disconnecting.

♦ Place parts that have been removed on a clean surface and

cover them over. Do not use fluffy cloths.

♦ Carefully cover or seal open components if repairs cannot be

carried out immediately.

♦ Only install clean components; replacement parts should only

be unpacked immediately prior to installation. Do not use parts

that have been previously unpacked and stored away loose

(e.g. in toolboxes, etc.).

♦ When the system is open: Do not work with compressed air.

Do not move vehicle.

Audi A3 2004 ➤

Direct petrol injection and ignition system (4-cyl. 2.0 ltr. 4-valve turbo) - Edition 11.2005

2 Rep. Gr.24 - Mixture preparation - injection

1 2 3 4 5 6 7 8 9 10 11 ... 18 19

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Audi A3 2004 User Manual Page 6

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