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Checking combination valve for secondary air system for proper operation and leakage - engine code BUB > < Secondary air system - exploded view

A3 Mk2

Checking combination valve for secondary air system for proper operation and leakage - engine code BDB, BMJ
Checking combination valve for secondary air system for proper operation and leakage - engine code BDB, BMJ
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.
–  Disconnect vacuum hose at combination valve.
–  Connect hand-operated vacuum pump to vacuum connection on combination valve.
  A26-0780
–  Remove air intake hose -arrow- at throttle valve module -J338- and push slightly to the side.
  A10-1896
–  Disconnect secondary air hose at the position marked with an -arrow-.
–  Blow gently into hose for combination valve (do not use compressed air).
l  The combination valve should be closed; it should not be possible to blow through the valve.
–  Operate vacuum pump.
l  The combination valve should open; it should now be possible to blow through the hose.
If the combination valve does not open:
–  Renew combination valve → Chapter.
  A10-1791

Checking combination valve for secondary air system for proper operation and leakage - engine code BUB > < Secondary air system - exploded view