audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

ABOUT US
Removing and installing combination valve for secondary air system (left-side) > < Removing and installing secondary air pump

A4 Cabriolet Mk2

Checking combination valve for secondary air system for proper operation and leakage
Checking combination valve for secondary air system for proper operation and leakage
Special tools and workshop equipment required
   
t  Hand vacuum pump with accessories -V.A.G 1390-
  W00-0515
Procedure
l  Vacuum hoses and hose connections do not leak.
l  Vacuum hoses are not clogged.
–  Pull off engine cover panel (rear) -arrows-.
  A10-1032
–  Unbolt the retaining plate for solenoid valves -arrows-.
–  Lift retaining plate and disconnect vacuum hose of relevant combination valve from Y-piece.
–  Connect the hand vacuum pump -V.A.G 1390- to vacuum hose of combination valve you want to check.
  A10-0993
–  Vehicles with auxiliary heater: remove bolts -arrows- securing exhaust pipe for auxiliary/additional heater to noise insulation.
  A10-0407
–  Release bolts or quick-release fasteners -1- and -2- and take off front noise insulation.
–  If fitted, open quick-release fasteners -3- and remove rear noise insulation.
  A10-1320
–  Disconnect pressure hose -arrow- at secondary air pump.
–  Blow lightly into pressure hose with your mouth (do not use compressed air).
l  Both combination valves must be closed and it must not be possible to blow through the hose.
–  Operate hand vacuum pump.
l  The combination valve should open; it should now be possible to blow through the hose.
If the relevant combination valve does not open:
–  Renew combination valve for secondary air system: on left-side → Chapter, on right-side → Chapter.
  A26-0527

Removing and installing combination valve for secondary air system (left-side) > < Removing and installing secondary air pump