A4 Quattro Wagon L4-1.8L Turbo (AWM) (2001)
Checking power supply
Test requirements:
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Fuse for wastegate bypass regulator valve OK
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Fuel pump relay OK.
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Connect voltage tester VAG 1527 B as follows:
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Operate starter briefly.
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LED must light up.
If the LED does not light up:
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Check wiring from contact 1 on connector via fuse to fuel pump relay for open circuit:
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Repair open circuit, if necessary
If the LED lights up:
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Check actuation.
Checking actuation
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Connect voltage tester VAG 1527 B to contacts 1 (positive) and 2 of connector.
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Initiate output Diagnostic Test Mode (DTM) and actuate Wastegate Bypass Regulator valve -N75-.