S4 Quattro Cabriolet V8-4.2L (BHF) (2008)
Exhaust Pressure Regulator Vacuum Solenoid: Testing and Inspection
Exhaust Flap Vacuum Diaphragm, Checking
Special tools, testers and auxiliary items required
‹› Hand vacuum pump (VAS 6213)
Test Sequence
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Disconnect hose on vacuum diaphragm for exhaust flap at rear muffler.
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Connect the hand vacuum pump to the vacuum diaphragm.
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Generate vacuum using hand vacuum pump.
‹› Linkage must move toward front.
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Vent the hand vacuum pump.
‹› Linkage must move toward rear.
If linkage does not move:
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Check the linkage for ease of movement and check the vacuum diaphragm for leaks.