A4 Quattro Wagon L4-2.0L Turbo (BPG) (2005)
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Using the Multimeter V.A.G. 1526 A or equivalent, check the Mass Air Flow (MAF) Sensor G70 electrical connector terminal 3 to engine Ground
(GND) for voltage.
Specified value: battery voltage
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Switch ignition off.
If the specified value is not obtained:
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Check wiring between Mass Air Flow (MAF) Sensor G70 electrical connector terminal 3 and Engine Component Power Supply Relay J757 for an
open circuit.
Specified resistance 1.5 Ohms max.
If the specification is not obtained:
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Check the wiring for a short circuit to Battery positive (+) or an open circuit.
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If necessary, repair the wiring connection.
If no malfunctions are found in the wiring:
Checking wiring
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Connect the Test Box 105 Pin VAG1598/42 to the wiring harness of the Engine Control Module (ECM) J623. The ECM is not connected.
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Using the Test Box 105 Pin VAG1598/42 and Multimeter V.A.G 1526 A or equivalent, check the following wiring connection for an open circuit.
Terminal
Test box socket
1
22
2
1
2
2
2
4
3
87
Specified resistance 1.5 Ohms max.
If the specification is not obtained:
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Check the wiring for a short circuit to Battery positive (+) or an open circuit.
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If necessary, repair the wiring connection.
If no malfunctions are found in the wiring:
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Replace Mass Air Flow (MAF) Sensor G70.
Final procedures
After repair work, the following work steps must be performed in the mentioned sequence: