A8 Quattro Sedan V8-4.2L (BGK) (2006)
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End diagnosis and switch ignition off.
If specified value is obtained, but DTC memory has a DTC concerning Mass Air Flow (MAF) sensor:
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Check voltage supply of Mass Air Flow (MAF) sensor.
If specified value is not obtained:
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Check signal and Ground (GND) wire of Mass Air Flow (MAF) sensor.
Voltage Supply, Checking
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Check fuse for Mass Air Flow (MAF) sensor.
If fuse is OK.
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Disconnect connector from Mass Air Flow (MAF) sensor.
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Connect multimeter to terminal 2 of connector and engine Ground (GND) for voltage measurement.
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Operate starter briefly (engine can also start briefly).
Specified value: approx. battery voltage
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If specified value is not reached, check wire connection from terminal 2 of connector to Fuel Pump (FP) relay via fuse for open circuit and short
circuit to Ground (GND), repair wire connection if necessary.
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Connect multimeter to terminal 2 and terminal 3 of connector for voltage measurement.