A4 Quattro Cabriolet L4-2.0L Turbo (BWT) (2009)
Air Bypass Valve: Testing and Inspection
Wastegate Bypass Regulator Valve, Checking
Wastegate Bypass Regulator Valve, Checking
Special tools, testers and auxiliary items required
‹› Multimeter.
‹› Wiring diagram.
Test requirements
‹› Fuse (S345) OK.
‹› The Engine Component Power Supply Relay (J757) OK.
‹› The ignition switched off.
‹› Voltage for the Wastegate Bypass Regulator Valve ( N75) is supplied by the Engine Component Power Supply Relay (J757).
Test procedure
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Perform a preliminary check to verify the customers complaint. Refer to => [ General Diagnosis ] See: Computers and Control Systems/Testing
and Inspection/Initial Inspection and Diagnostic Overview/General Diagnosis.
Start diagnosis
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Remove engine cover - arrows -.
Checking internal resistance
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Disconnect electrical harness connector - 2 - at Wastegate Bypass Regulator Valve (N75).