A4 Quattro Cabriolet L4-2.0L Turbo (BWT) (2009)
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Start the engine and let it run at idle.
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Using a multimeter, check the Mass Air Flow (MAF) Sensor (G70) electrical harness connector terminal 3 to Ground (GND).
Specified value: battery voltage.
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Switch the ignition off.
If specified value was not obtained:
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Check the Mass Air Flow (MAF) Sensor (G70) electrical harness connector terminal 3 to the Ignition/Starter Switch (D) terminal 6/15 for an open
circuit, a short circuit to each other, Battery (+), and Ground (GND).
If no malfunction is detected in the wiring and the voltage supply was OK:
Checking Ground (GND)
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Using a multimeter, check the Mass Air Flow (MAF) Sensor (G70) electrical harness connector terminal 2 to Ground (GND) location in engine
compartment left for resistance.