S5 Quattro Coupe V8-4.2L (CAUA) (2009)
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Replace the faulty Ignition Coils with Power Output Stage (N323, N324, N325, N326).
If the LED does not flicker:
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Using a Multimeter, check the Ignition Coil electrical harness connector terminal 2 to Ground (GND) connection 2 (on right rear chassis side
member) for resistance.
Specified value: 1.5 ohms Max.
If the specified value was not obtained:
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Check the wiring connection for an open circuit or a short circuit to Battery (+).
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Check the wiring connection for damage, corrosion, loose or broken terminals.
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If necessary, repair the faulty wiring connection.
If the specified value was obtained:
Checking wiring
If the manufacturers test box is being used, perform the following step.
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Install the test box.
If the manufacturers test box is not being used, perform the following step.
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Remove the Motronic Engine Control Module (ECM) (J623). Refer to => [ Engine Control Module, Replacing ] See: Computers and Control
Systems/Engine Control Module/Service and Repair/Engine Control Module, Replacing.
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Using a Multimeter, Check the Ignition Coil electrical harness connector to the Motronic Engine Control Module (ECM) (J623) electrical harness
connector T60 for resistance.
Specified value: 1.5 ohms Max.
If the specified value was not obtained:
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Check the wiring connection for an open circuit, short circuit to Battery (+) or Ground (GND).