Q7 Quattro V8-4.2L (BAR) (2008)
Checking voltage supply
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Disconnect the Mass Air Flow (MAF) Sensor (G70)/Intake Air Temperature (IAT) Sensor (G42) electrical harness connector - 4 -.
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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)/Intake Air Temperature (IAT) Sensor (G42) 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)/Intake Air Temperature (IAT) Sensor (G42) electrical harness connector terminal 2 to the Engine
Component Power Supply Relay (J757) terminal 2/87 for an open circuit.