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Checking secondary air inlet valve N112 > < Secondary air system - exploded view of components

A4 Mk1

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-operated vacuum pump -VAS 6213-
  W00-10259
Procedure
l  Vacuum hoses and hose connections do not leak.
l  Vacuum hoses are not clogged.
–  Release quick-release fasteners and remove engine cover panel -arrows-.
  A10-0661
–  Remove vacuum hose at combination valve for secondary air -arrow-.
  Note
For illustration purposes, the installation position is shown from the rear and with the engine removed.
–  Connect hand-operated vacuum pump to vacuum connection on combination valve for secondary air system.
  A26-0424
–  Disconnect hose -arrow- at pipe leading to combination valve for secondary air and attach test hose.
–  Blow gently into pipe (do not use compressed air).
l  The combination valve for secondary air system should be closed; it should not be possible to blow through the hose.
–  Operate hand-operated vacuum pump to produce a vacuum
l  The combination valve should open; it should now be possible to blow through the hose.
–  Renew combination valve for secondary air system if valve does not react as described → Chapter.
  A26-0425

Checking secondary air inlet valve N112 > < Secondary air system - exploded view of components