A3 L4-2.0L Turbo (BPY) (2006)
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Disconnect the Mass Air Flow (MAF) Sensor G70 electrical harness connector - 1 -.
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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 engine 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 Power Supply Relay (terminal 50) J682 terminal 1/30
for an open circuit.
Specified value: 1.5 Ohms max.
If no malfunction is detected in the wiring and if the voltage supply was OK:
Checking electrical circuit
If the manufacturers test box is being used. Perform the following step.
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Install the test box.
If the manufacturers test box is not being used. Perform the following step.
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Remove the Motronic Engine Control Module (ECM) J220.
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Using a multimeter , check the Mass Air Flow (MAF) Sensor G70 electrical harness connector terminals to the Motronic Engine Control Module
(ECM) J220 electrical harness connector T94 terminals for an open circuit.