S5 Quattro Coupe V8-4.2L (CAUA) (2009)
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Using a Multimeter , check the Fuel Metering Valve 2 (N402) terminals 1 to 2 for resistance
Specified value: 450 to 1000 ohms.
If the specified value was not obtained:
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Replace the Fuel Metering Valve 2 (N402).
If the specified value was obtained:
Checking voltage
Crank the engine.
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Using a Multimeter, check the Fuel Metering Valve 2 (N402) electrical harness connector terminal 1 to Ground (GND) for voltage.
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 wiring from the Fuel Metering Valve 2 (N402) electrical harness connector terminal 1 to the Fuse (on fuse/relay panel) (S5) for an open
circuit or a short circuit to Ground (GND).
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Check the electrical harness connector for damage, corrosion, loose or broken terminals.
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If necessary, repair the wiring connection.
