I had a code P0456 small Evap leak . I used the  active test for the purge control solenoid which worked , but could find no active test listed for the Evap Vent (close valve).
    I looked under special functions and it listed a Evap leak test which it appeared to do and complete but there was no PID data displayed during the test and no pass or fail result of the test was shown after it had completed.

https://www.youtube.com/watch?v=zODklbOTpwY

Tags: maxisys , problem

  Even if evap leak test failure results in a code after clearing the code beforehand,it is only going to confirm, that it indeed still has a small leak somewhere that has not been resolved. This test be more useful to confirm a problem before repair, and confirm the repair afterwards, however I need  active test  to close the canister vent valve (canister close valve) with the scantool to smoke test the system to find the leak without unnecessary work of dropping the canister down to access the valve on top  and manually grounding  a wire to hear the vent valve works or pinch off some hose I can't see where it goes to know which hose I would need  to pinch off.