RS 4 Quattro Cabriolet V8-4.2L (BNS) (2008)
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Crank the engine.
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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 2 to engine Ground (GND) for voltage.
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
Motronic Engine Control Module (ECM) Power Supply Relay (J271) socket 2/87 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. Refer to Fuel Injection and Ignition Repair Information.
If the manufacturers test box is not being used. Perform the following step.
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Remove the Motronic Engine Control Module (ECM) ( J623). Refer to => [ Engine Control Module 1, Removing and Installing ] See: Computers
and Control Systems/Engine Control Module/Service and Repair/Engine Control Module 1, Removing and Installing.