A3 L4-2.0L Turbo (CBFA) (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/Scan Tool Testing
and Procedures/Preliminary Check
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 specified value is obtained, but DTC memory has a DTC concerning Mass Air Flow (MAF) Sensor G70 :
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Check voltage supply of Mass Air Flow (MAF) Sensor G70.
If specified value was not obtained:
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Check the Mass Air Flow (MAF) Sensor G70 electrical circuit.
Checking voltage supply