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Lambda probes > < Checking intake manifold change-over function

A3 Mk2

Checking dual non-return valve
Checking dual non-return valve
Special tools and workshop equipment required
   
t  Hand vacuum pump -VAS 6213-
t  Auxiliary measuring set -V.A.G 1594C-
Test condition
l  Activated charcoal filter solenoid valve 1 -N80- has been checked with a vehicle diagnostic tester and is OK.
–  Carefully pull off engine cover panel.
  N24-10282
–  Unplug connector -1- and detach breather hose -3- from activated charcoal filter solenoid valve 1 -N80--2-.
  A24-10582
–  Move adjuster ring -1- on hand vacuum pump -VAS 6213- to position -A- to select "vacuum".
  N24-10282
–  Connect hand vacuum pump -VAS 6213- to activated charcoal filter solenoid valve 1 -N80-.
–  Connect contacts of activated charcoal filter solenoid valve 1 -N80--1- to battery using test leads. This will open activated charcoal filter solenoid valve 1 -N80-.
Then immediately operate hand vacuum pump -VAS 6213- several times.
l  Vacuum should build up.
–  Again disconnect battery to cut off current supply.
If vacuum does not build up:
–  Renew dual non-return valve -1-.
Dual non-return valve, activated charcoal filter solenoid valve 1 -N80- and plastic hoses are combined as one unit and can only be renewed together.
  A24-10583

Lambda probes > < Checking intake manifold change-over function