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Ignition system, glow plug system > < Assembly overview - parts of secondary air system

Golf Mk4

Checking combination valve
Checking combination valve
Special tools and workshop equipment required
   
t  Hand vacuum pump -VAS 6213-
Test prerequisites
l  Vacuum pipes and hose connections free of leaks.
l  Vacuum pipes not blocked or kinked.
Test procedure
  Note
Do not use compressed air during the following check!
–  Remove engine cover.
–  Remove intake hose and intake connecting flange between air mass meter and throttle valve module → Chapter.
  W00-10259
–  Pull off vacuum hose from secondary air inlet valve -N112- on combination valve -arrow-.
  N26-0427
–  Connect hand vacuum pump -VAS 6213- to vacuum connection on combination valve -arrow-.
  N26-0428
–  Detach pressure hose to combination valve at connection -arrow- and blow in softly. Combination valve must be closed.
–  Operate hand vacuum pump -VAS 6213-. Combination valve must open.
If the combination valve does not open, or is constantly open:
–  Renew combination valve → Item.
  N26-0338

Ignition system, glow plug system > < Assembly overview - parts of secondary air system