I need a scan tool for doing evap work to my truck. I had a smoke test done on my truck at a repair shop a few years ago and the option to open/close the vent valve or purge solenoid was there so i know my vehicle has these options. My question is how do i know witch scanner will do manual functions like this? What do i need to make sure this scanner has in the description to know that it does these functions? Any help would be fantastic. Thanks so much