Audi A6 - Ignition System; General Information; Safety Precautions; Ignition System General Information

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28 – Ignition system
1 General Information
⇒ “1.1 Safety Precautions”, page 54
⇒ “1.2 Ignition System General Information”, page 54
1.1 Safety Precautions
If Special Testing Equipment is Required During Road Test, Note
the Following
WARNING
♦ Test and measuring equipment must always be secured to
the rear seat and be operated from there by a second per‐
son.
♦ If test and measuring instruments are operated from the
front passenger's seat and the vehicle is involved in an ac‐
cident, there is a possibility that the person sitting in this
seat may receive serious injuries when the airbag is trig‐
gered.
To Reduce the Risk of Personal Injury and/or Damage to the Fuel
Injection and Ignition System, Always Observe the Following
♦ Do not touch or disconnect wires of ignition system when en‐
gine is running or turning at starting RPM.
♦ Always switch ignition off before disconnecting or reconnect‐
ing wires for injection and ignition system, including high volt‐
age wiring and test leads.
♦ If the engine is to be cranked at starting RPM without starting
(e.g. during compression test), disconnect electrical connec‐
tors on ignition coils and on fuel injectors. After performing
work, check and erase DTC memory.
♦ 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 .
1.2 Ignition System General Information
♦ For trouble-free operation of the electrical components a volt‐
age of at least 12.5 V is necessary.
♦ It is possible that the control module will recognize a malfunc‐
tion and store a DTC during some tests. Therefore after com‐
pleting all checks and repairs the DTC memory must be
checked and if necessary erased.
♦ If the engine only starts briefly and then turns off again after
troubleshooting, repair or checking of the components, it may
be that the immobilizer is blocking the Engine Control Module
Audi A6 2005 ➤
Fuel Injection and Ignition - Edition 03.2008
54 Rep. Gr.28 - Ignition system