A3 Quattro V6-3.2L (BUB) (2008)
Air Flow Meter/Sensor: Testing and Inspection
Mass Air Flow Sensor, Checking
NOTE: Use only gold-plated terminals when servicing terminals in harness connector of Mass Air Flow (MAF) Sensor G70.
Special tools, testers and auxiliary items required
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Multimeter.
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Wiring diagram.
Test requirements
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The Mass Air Flow (MAF) Sensor G70 fuse OK.
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Battery voltage at least 12.5 volts.
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All electrical consumers such as, lights and rear window defroster, switched off.
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Vehicles with automatic transmission, shift selector lever into position "P" or "N".
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A/C switched off.
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Ground (GND) connections between engine/transmission/chassis OK. Coolant Temperature at least 80 degrees C.
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Ignition switched off.
Test procedure
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Perform a preliminary check to verify the customers complaint. See: Computers and Control Systems/Testing and Inspection/Initial Inspection
and Diagnostic Overview/General Diagnosis
Start diagnosis
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Connect the scan tool.
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Start engine and let it run at idle.
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Using the scan tool, Check the air flow quantity of the Mass Air Flow (MAF) Sensor G70 at idle:
Diagnostic text
Specified value
Air flow quantity at Mass Air
Flow (MAF) sensor
Engine running at idle
2.00 to 5.00 g/sec
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End diagnosis and switch ignition off.
If the specified value was obtained, but the DTC memory has a DTC concerning the Mass Air Flow (MAF) Sensor G70 :
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Check the voltage supply of the Mass Air Flow (MAF) Sensor G70.
If specified value was not obtained:
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Check the wiring of the Mass Air Flow (MAF) Sensor G70.
Checking voltage supply
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Disconnect the Mass Air Flow (MAF) Sensor G70 electrical harness connector - 3 -.
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Start the engine and let it run at idle.