Exhaust Flap, Checking

Exhaust Flap, Checking

Special tools, testers and auxiliary items required







- 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.







Display on VAS 5051 :
- In selection - 1 - , click on function "03 - output Diagnostic Test Mode (DTM)".







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







- 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. Testing and Inspection
- 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.