A3 Quattro V6-3.2L (BUB) (2008)
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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 2 to the Fuel Pump (FP) 2 Relay J49 terminal 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.
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 T121 terminals for an open circuit.
Mass Air Flow (MAF) Sensor
Motronic Engine Control Module
G70 electrical harness
(ECM) J220 electrical connector
connector terminals
T121 terminals or test box socket
1
26
3
27
4
53
5
29
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.