A4 Sedan L4-1.8L Turbo (AWM) (2001)
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NOTE: Voltage is supplied to Mass Air Flow (MAF) sensor from Fuel Pump (FP) relay.
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Disconnect connector from Mass Air Flow (MAF) sensor.
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Connect multimeter for voltage measurement as follows.
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Operate starter briefly (engine can also start).
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Specification: approx. battery voltage
If specified value is not obtained:
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Check wire connection from terminal 2 of connector to Fuel Pump (FP) relay via fuse for open circuit and short circuit to Ground (GND):
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Repair open circuit or short circuit if necessary.
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Connect multimeter to terminal 2 and terminal 3 of connector for voltage measurement.
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Operate starter briefly (engine can also start).
