audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

Air Bypass Valve, Turbocharger|Testing and Inspection|Page 4552 > < Throttle Position Sensor|Locations|Page 4547
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Air Bypass Valve: Testing and Inspection

Turbocharger Recirculating Valve, Checking

Special tools, testers and auxiliary items required

‹› multimeter.

‹› Wiring diagram.

Test requirements

‹›  The Motronic Engine Control Module (ECM) ( J623 ) fuses OK.

‹› Battery voltage at least 12.5 volts.

‹› All electrical consumers such as, lights and rear window defroster, switched off.

‹› On vehicles with automatic transmission, selector lever in position " P" or "N".

‹› A/C switched off.

‹› Ground (GND) connections between engine/transmission/chassis OK.

‹› Ignition switched off.

Test procedure

-

Perform a preliminary check to verify the customers complaint. Refer to => [ Preliminary Check ] See: Computers and Control Systems/Testing
and Inspection/Scan Tool Testing and Procedures/Preliminary Check

Start diagnosis

-

Remove the engine cover with air filter. 

Air Bypass Valve, Turbocharger|Testing and Inspection|Page 4552 > < Throttle Position Sensor|Locations|Page 4547