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Removing and installing combination valve for secondary air system (left-side) > < Removing and installing secondary air pump motor V101

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-
Test conditions
l  Vacuum hoses and hose connections do not leak.
l  Vacuum hoses are not clogged.
  W00-0515
Test sequence
–  Remove engine cover panel -arrows-.
  A10-0113
–  Pull vacuum hose off Y-piece -arrow- of combination valve you want to check.
  N26-0195
–  Connect the hand vacuum pump -V.A.G 1390- to vacuum hose of combination valve you want to check.
  N26-0196
–  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.
  A10-1320
–  Detach pressure hose -arrow- from secondary air pump motor and blow into it with light pressure (do not use compressed air).
t  Both combination valves must be closed and it must not be possible to blow through the hose.
–  Operate hand vacuum pump.
t  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: left-side → Chapter, right-side → Chapter.
  A26-0527

Removing and installing combination valve for secondary air system (left-side) > < Removing and installing secondary air pump motor V101