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28 – Ignition system
1 General notes and safety precau‐
tions
1.1 General notes on ignition system
♦ The engine control unit has a self-diagnosis capability.
♦ A voltage of at least 11.5 V is required for proper operation of
the electrical components.
♦ Certain tests may lead to entries being stored in the event
memory of the engine control unit. The event memory must be
interrogated after completing all tests and repair work.
♦ If the engine starts, runs for a short period and then cuts out
after completing fault finding, repairs or component tests, this
may be due to the immobilizer disabling the engine control
unit. The event memory of the engine control unit must then
be interrogated and, if necessary, the control unit must be
adapted.
1.2 Safety precautions when working on the
injection and ignition system
To prevent injuries to persons and/or damage to the fuel injection
and ignition system, note the following:
♦ Persons wearing a cardiac pacemaker must at all times main‐
tain a safe distance from high-voltage components such as the
ignition system and xenon headlights.
♦ Do not touch or disconnect ignition wiring when the engine is
running or being turned at starter speed.
♦ Always switch off the ignition before connecting or discon‐
necting electrical wiring for the injection or ignition system or
tester cables.
♦ Always switch off ignition before washing engine.
♦ If you want to crank the engine at starting speed without ac‐
tually starting the engine (e.g. compression test), first unplug
the electrical connectors from the ignition coils ⇒ page 53 .
♦ Also remove fuse for fuel pump control unit -J538- ⇒ Current
flow diagrams, Electrical fault finding and Fitting locations.
♦ Entries will be stored in the event memory of the engine control
unit if electrical connectors have been unplugged and the en‐
gine started.
Caution
To prevent irreparable damage to the electronic components
when disconnecting the battery:
♦ Observe notes on procedure for disconnecting the battery.
♦ Always switch off the ignition before disconnecting the
battery.
– Disconnecting battery ⇒ Electrical system; Rep. gr. 27
Audi A8 2010 ➤
Simos direct petrol injection and ignition system (6-cyl. 3.0 ltr. TFSI 4-valve) - Edition 12.2011
50 Rep. gr.28 - Ignition system
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