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Check double non-return valve > < Testing components

Yeti

Test intake manifold changeover
Test intake manifold changeover
Special tools and workshop equipment required
t  Hand vacuum pump, e.g. -VAS 6213-
  Note
Observe all safety measures and notes for assembly work on the fuel, injection and ignition system as well as the rules for cleanliness → Chapter.
The test should only be carried out if there is a problem with a poor torque. I.e. if insufficient elasticity or poor pulling power exists.
Test condition
l  The valve for intake manifold flap -N316- was checked with the → Vehicle diagnostic, testing and information system VAS 5051.
Test sequence
If the intake manifold valve -N316- is o.k., perform the following tests:
–  Remove engine cover.
–  Start engine and run in idle.
   
–  The engine speed can suddenly be increased by a 2nd person (high acceleration). Observe vacuum setting element for intake manifold changeover.
l  The setting element must be tightened -arrow-.
If the switch-over does not function as indicated:
–  Inspect the vacuum system for tightness.
–  Check smooth operation of changeover mechanism. To this end activate the linkage by hand.
–  Inspect vacuum lines to see that they are connected properly.
–  Check vacuum hoses for porosity.
–  Detach the vacuum hose -1- to the variable intake manifold changeover positioning element at the intake manifold flap valve -N316--2-.
  S24-0709
–  Put the control ring -1- of the hand vacuum pump -VAS 6213- in position -B- for „vacuum“.
–  Connect the hand vacuum pump -VAS 6213 - to the intake manifold flap valve positioning element.
  N24-10282
–  Operate the hand vacuum pump -VAS 6213 - several times.
   The vacuum setting element must move -arrows-.
–  If the vacuum setting element does not move, replace the vacuum setting element.
  S24-0710

Check double non-return valve > < Testing components