A4 Quattro Sedan L4-2.0L Turbo (CAEB) (2009)
If the specification is obtained:
Checking Voltage supply
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Using a multimeter, check the Wastegate Bypass Regulator Valve (N75) electrical harness connector terminal 1 to Ground (GND).
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Operate the engine briefly.
Specified value: battery voltage.
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Switch the ignition off.
If the specification was not obtained:
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Check the wiring for a short circuit to Battery positive (+) or an open circuit.
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Check the electrical harness connector for damage, corrosion, loose or broken terminals.
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If necessary, repair the wiring connection.
If no malfunction is found in the wiring:
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) ( J623).
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Using a multimeter, check the Wastegate Bypass Regulator Valve (N75) electrical harness connector terminal 2 to the Motronic Engine Control
Module (ECM) (J623) electrical harness connector T60 terminal 51 for an open circuit.