GTI L4-2.0L Turbo (BPY) (2007)
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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 2 (terminal 15) J681 terminal 2
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 Ground (GND)
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Using a multimeter, check the Mass Air Flow (MAF) Sensor G70 electrical harness connector terminal 2 to engine Ground (GND) for resistance.
Specified value: 1.5 Ohms max.
If the specification was not obtained:
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Check the wiring for a short circuit to each other, Battery (+), and Ground (GND).
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Check the electrical harness connector for damage, corrosion, lose or broken terminals.
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If necessary, repair the faulty wiring connection.