A4 Quattro Wagon L4-2.0L Turbo (BPG) (2005)
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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
13
2
14
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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Using multimeter V.A.G 1526 B or equivalent, check Intake Air Temperature (IAT) Sensor G42 electrical connector terminals 1+2 for resistance.
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Area A: Resistance values for temperature range 0 to 50 degrees C.
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Area B: Resistance values for temperature range 50 to 100 degrees C.
Read-out examples:
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30 degrees C is in range A and corresponds to a resistance of 1.5 to 2.0 k Ohms
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80 degrees C is in range B and corresponds to a resistance of 275 to 375 Ohms
If the specification is not obtained:
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Replace Intake Air Temperature (IAT) Sensor G42.
If the specification is obtained:
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Replace the Engine Control Module (ECM) J623.