A4 Quattro Wagon L4-1.8L Turbo (ATW) (2000)
Air Flow Meter/Sensor: Testing and Inspection
Voltage Supply For Mass Air Flow (MAF) Sensor, Checking
Voltage Supply For Mass Air Flow (MAF) Sensor, Checking
Test requirements:
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Fuse for Mass Air Flow (MAF) sensor OK
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Fuel Pump (FP) relay OK; See: Fuel Pump/Fuel Pump Relay/Testing and Inspection
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.
Harness connector
Measure to
Terminal
2
Engine Ground (GND)
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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).
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Specification: approx. battery voltage