A4 Quattro Cabriolet L4-2.0L Turbo (BWT) (2009)
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Operate the starter briefly.
Specified value: battery voltage.
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Switch the ignition off.
If the specified value was not obtained:
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Check the Wastegate Bypass Regulator Valve (N75 ) electrical harness connector terminal 1 to the Engine Component Power Supply Relay (J757)
socket 2/87 for an open circuit, short circuit to each other, Battery (+), or Ground (GND).
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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 malfunctions are found in the wiring:
Checking wiring
If the manufacturers test box is being used. Perform the following step.
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Install the test box. Refer to Fuel Injection and Ignition Repair Information
If the manufacturers test box is not being used. Perform the following step.
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Remove the Engine Control Module (ECM) (J623). Refer to => [ Engine Control Module, Replacing ] See: Computers and Control
Systems/Engine Control Module/Service and Repair.
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Using a multimeter, check the Wastegate Bypass Regulator Valve (N75) electrical harness connector terminal 2 to Engine Control Module (ECM)
(J623) electrical harness connector T60 terminal 21 for resistance.