A8L Quattro Sedan V8-4.2L (BVJ) (2007)
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Using a Multimeter , check the Fuel Metering Valve 2 (N402) terminals for resistance
Specified value: 450 to 1000 ohms.
If the specified value was not obtained:
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Replace the High Pressure Fuel Pump.
If the specified value was obtained:
Checking voltage
Switch the ignition on.
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Using a Multimeter, check the Fuel Metering Valve 2 (N402) electrical harness connector terminal 1 to Ground (GND) for voltage.
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Switch the ignition off.
Specified value: battery voltage.
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 Engine Component Power Supply Relay
(J757) terminal 2/87 for a short circuit to Ground (GND), or an open circuit.
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Check the electrical harness connector for damage, corrosion, lose or broken terminals.
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If necessary, repair the wiring connection.