Sync your account with destinyoptimizer.com it's fantastic. Click Pinnacle on the right, it will tell you which are T2 or T1 drops (no +3s in the game right now AFAIK, there is a T3 powerful but those don't last long and a T1 pinnacle is better (gives +4 at that stage)).
Not sure why a few responses amounted to "you can't do it". Last few seasons I have almost exclusively farmed the T2 pinnacles to get my level up, they're not gated off. Preservation, Dares 250k, Weekly campaign, Nightfall 100k all T2 pinnacle, all easily ran with a few clicks on fireteam finder if need be..