S5 Quattro Coupe V8-4.2L (CAUA) (2009)
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Remove the electrical harness connector screws - 1 - and - 2 -.
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Disconnect the Ignition Coil electrical harness connectors.
Checking voltage supply
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Crank the engine.
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Using a Multimeter, check the Ignition Coil electrical harness connector terminal 1 to Ground (GND) for voltage.