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Removing and installing combination valve for secondary air system > < Principle and function

A4 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
   
Test sequence
  Note
Fit all heat insulation sleeves in the original position when installing.
–  If fitted, detach cover -1- on right of engine compartment.
  A10-1030
–  Disengage solenoid valve 1 for activated charcoal filter system -N80--item 1- at air duct.
–  Unscrew bolts -arrows-.
–  Remove air duct -2-.
  A10-0900
–  Pull back heat insulation sleeve and disconnect hose at pipe leading to combination valve for secondary air system -arrows-.
  Note
Disregard -item 1-.
–  Connect an auxiliary hose to pipe leading to combination valve for secondary air system and blow lightly into pipe with your mouth (do not use compressed air).
l  The combination valve must be closed; blowing through must not be possible.
–  Blow into pipe with your mouth using more pressure (do not use compressed air).
l  The combination valve should open; it should now be possible to blow through the pipe.
If the combination valve does not open:
–  Renew combination valve → Chapter.
  A15-1001

Removing and installing combination valve for secondary air system > < Principle and function