S5 Quattro Coupe V8-4.2L (CAUA) (2009)
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Specified value: battery voltage.
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Switch the ignition off.
If the specified value was not obtained:
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Check the Ignition Coil electrical harness connector terminal 1 to the Motronic Engine Control Module (ECM) Power Supply Relay (J271) socket
2/87 for an open circuit or a short circuit to Ground (GND).
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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:
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Using a Multimeter, check the Ignition Coil electrical harness connector terminal 4 to Ground (GND) connection 2 (on engine right) 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 activation
CAUTION!
Do not touch the Ignition Coils connecting parts or adapter cables during the following test.
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Disable the power supply to the Fuel Injectors.
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Using a diode test lamp, check the Ignition Coil electrical harness connector terminals 2 to 3 for voltage.
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Crank the engine.
The LED should flicker.
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Switch the ignition off.
If the LED flickers and the voltage was OK:
