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24 – Fuel injection system
1 General Information
⇒ “1.1 Safety Precautions”, page 1
⇒ “1.2 Clean Working Conditions”, page 2
⇒ “1.3 High-Pressure Fuel Injection System, Pressure Relief”,
page 2
⇒ “1.4 Fuel System Bleeding”, page 5
1.1 Safety Precautions
To Reduce the Risk of Personal Injury and/or Damage to the Fuel
Injection and Ignition System, Always Observe the Following
WARNING
♦ Fuel system is under high pressure! Before opening high
pressure components of the fuel injection system, pressure
must be relieved to residual pressure ⇒ page 2 .
♦ Then wrap a clean rag around the connection and relieve
residual pressure by carefully loosening the connection.
♦ The ignition must be switched off before connecting or dis‐
connecting injection and ignition system wiring or tester ca‐
bles.
♦ It is possible that the control module will recognize a malfunc‐
tion and store a DTC during some tests. Therefore, when all
tests and repairs are completed, the DTC memory must be
checked and, if necessary, erased. After DTC memory is
erased, a readiness code must be generated for the engine
control module using operating mode “Guided Fault-Finding”.
♦ Clean engine only with ignition switched off.
Caution
♦ The battery must only be disconnected and connected with
the ignition switched off, since the Engine Control Module
(ECM) can otherwise be damaged.
♦ Observe safety precautions when disconnecting the battery
⇒ Electrical Equipment; Rep. Gr. 27 ; Removal and Instal‐
lation .
Audi A6 2005 ➤
Fuel Injection and Ignition - Edition 03.2008
1. General Information 1
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