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It will stay on if you've got it open to an active screen like one of the gauge monitoring screens, otherwise it will go into sleep mode but remain on, which if left plugged in will drain the battery, just a warning.
I've found that it will sleep and use very little power if you leave it on the monitoring screen, but it uses more power when it's still actively looking for data such as when you're just on the main screen.
Mine is telling me to reflash ECM and it will not upload tune to vehicle.
THIS SHOULD HELP YOU, TOO:
NOTE : When tuning, leave the driver side door open so the key off steps completely turns off everything.
When you get the tuner, first thing is to plug it up to your pc and run an update using dsdownloader which you can get from the Diablo website. That's found in the downloads section on the Diablo site. Run dsdownloader with the trinity attached to ur pc. Then click on the express tab and then click on update tool. Then load a preloaded tune file in ur vehicle. If your pcm isn't at the latest flash revision it will state that and then you can go back to ur pc and run dsdownloader. Click on Calibration Update to download your new pcm info into the tuner. Once completed carry it back to the vehicle and it will flash the pcm with the latest revision. If you have any trouble with that, contact DiabloSport tech support and they can walk you through it. Once that is done, THEN you can load in a preloaded tune file.
Maybe post what you were doing wrong to help others. Thought I saw someone yesterday having similar issues. Hope it all goes smooth now.