Exhaust Pressure Regulator: Testing and Inspection
Exhaust Flap, Checking
Special tools, testers and auxiliary items required
• Vehicle diagnostic, testing, and information system (VAS 5051B)
Test Sequence
- Let engine run briefly so that the required vacuum for the test is present in vacuum reservoir.
- Switch the engine off and connect the Vehicle Diagnosis, Testing and Information System (VAS 5051B).
- Switch on ignition.
- Press the Vehicle Self-Diagnosis button, select vehicle system "01 - Engine electronics" and activate with the -> button.
Display on (VAS 5051B):
- In selection - 1 -, press "011 - Measured values " and activate by pressing the -> button.
- Press the -> button repeatedly until Exhaust Flap Valve 1 (N321) 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. Refer to => [ Exhaust Flap Vacuum Diaphragm, Checking ] Testing and Inspection.
- Check vacuum line to vacuum reservoir and to Exhaust Flap Valve 1 (N321) under left side trim in luggage compartment.
- Check the Exhaust Flap Valve 1 (N321) and in the "Guided Fault Finding" operating mode.
- End function "03 - Output Diagnostic Test Mode (DTM)" by pressing the <- button.
- Press "06 - End Output".
- Switch off ignition.