A4 Quattro Wagon L4-2.0L Turbo (BPG) (2005)
Air Flow Meter/Sensor: Testing and Inspection
Mass Air Flow (MAF) Sensor G70, Checking
Special tools, testers and auxiliary items required
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Multimeter V.A.G 1526 or equivalent.
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Test Box 105 Pin VAG1598/42.
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Adapter Lead Vag1598/39 VAG1598/39.
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Adapter cable V.A.G 1598/39-1.
NOTE: Use only gold-plated terminals when servicing terminals in harness connector of Mass Air Flow (MAF) Sensor G70.
Test requirements
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Fuse for Mass Air Flow (MAF) Sensor G70 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.
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Coolant Temperature at least 80 degrees C.
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Ignition switched off.
Function test
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Connect the diagnostic tester.
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Start engine and let it run at idle.
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Select "Diagnostic mode 1: Check measured values".
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Select measuring value "PID 16: Air stream amount at Mass Air Flow (MAF) sensor".
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Check specified value of air flow quantity at Mass Air Flow (MAF) Sensor G70 at idle:
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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 is not obtained:
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Check wiring of Mass Air Flow (MAF) Sensor G70.
Checking voltage supply
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Disconnect the electrical harness connector - 1 - from the Mass Air Flow (MAF) Sensor G70.
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Start engine and let it run at idle.