Exhaust flap, checking

WARNING: This page is about a different car, the 2008 Audi RS 4 and 2007 Audi RS 4. However, it is still accessible from the selected car via links, so may be relevant.

Special tools, testers and auxiliary items required

Fig 1: Identifying Vehicle Diagnosis, Testing And Information System VAS 5051B

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Vehicle diagnostic, testing, and information system VAS 5051

Work procedure

Let engine run briefly so that the required vacuum for the test is present in vacuum reservoir.
Switch off engine and connect Vehicle Diagnostic, Testing and Information System VAS 5051 and select vehicle system "01 - engine electronics". Thereby, the ignition must be switched on.

Fig 2: Diagnostic System VAS 5051: Display

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Display on VAS 5051 :

In selection - 1 - , click on function "03 - output Diagnostic Test Mode (DTM)".

Fig 3: Identifying Left Front/Right Rear Electronic Differential Lock Intake Valve N321

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Tap → button until Left Front/Right Rear Electronic Differential Lock Intake Valve N321 - arrow - at left in luggage compartment is activated.

Fig 4: Operating Rod For Exhaust Flap Must Move Back And Forth At Both Rear Mufflers

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Operating rod - arrow - for exhaust flap must move back and forth at both rear mufflers.

If actuator rod does not move:

Check exhaust flap vacuum reservoir → Exhaust flap vacuum reservoir, checking .
Check vacuum line to vacuum reservoir and to Exhaust Flap Valve 1 N321 under left side trim in luggage compartment.
Check Left Front/Right Rear Electronic Differential Lock Intake Valve N321 and using "Guided Fault Finding".
End function "03 - output Diagnostic Test Mode (DTM)" by pressing ← button.

Select "06 - End Output".
Switch off ignition.