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Exhaust system > < Airtightness of the activated charcoal filter system: testing

Leon Mk2

Test process
Test process
   
–  Remove the deaeration hose -2- from the throttle valve drive unit -3- to the activated charcoal filter -1-.
–  Attach the hose -2- to manual vacuum pump -SAT 1390-.
–  Remove the deaeration hose -5- from the fuel tank to the activated charcoal filter and attach it to vacuum gauge -V.A.G 1368-. To do so use adaptor -SAT 1368/1-.
–  Attach the deaeration hose -4- that goes to the activated charcoal filter to vacuum gauge -V.A.G 1368- -input B-. To do so use adaptor -SAT 1368/1-.
–  Set the vacuum gauge at position -B-.
–  Start final control diagnosis and select the solenoid valve -N80-: → Rep. Gr.01
–  Activate several times the manual vacuum pump. No vacuum should occur.
If vacuum occurs:
–  Check for dirt in the deaeration hose -6- of the fuel tank -1- and clean if necessary.
If no vacuum occurs:
–  Remove the fuel filler cap.
  E20-0017
–  Connect manual vacuum pump -SAT 1390- to vacuum gauge -V.A.G 1368- -intake B-.
–  Set the vacuum gauge at position -A/B-.
–  Activate several times the manual vacuum pump. No vacuum should occur.
If vacuum occurs:
–  Test the gravity/safety valve → Item
–  Measure the continuity of flow of the fuel tank line -1-.
If no vacuum occurs:
–  Fit the fuel filler cap.
–  Activate several times the manual vacuum pump. No vacuum should occur.
  Note!
If the fuel level in the fuel tank is low, the manual vacuum pump must be activated approx. 20...30 times.
If vacuum occurs:
–  Replace the fuel filler cap.
  E20-0018

Exhaust system > < Airtightness of the activated charcoal filter system: testing