L stand for "SINGLE" mean in "L" gear will remain to 1st one...it won't shift to 2nd gear.
but if you drop from "2" to "L" sometime on highspeed it don't shift down becoz of precaution..your car is clever..just to save gears it won't shift to 1st when you are driving above 50km or soo
but when you start your car frm "L" at tht time you can take it 1st gear at anyspeed till the fuel cut system get activated...whenever u want to change..you can do it
in "2" mean only 2 gears in this you can push your 2nd gear ... until the fuel cut system get activated..and mostly in VITZ(which i have) fuel cut at 107km/hr in 2nd gear i tried once
hmmm...these gear can be use in race,or let say when you more want power and less economy
hmm changing from D to "2" is just Ok...you can shift but try not to do with high revs...let the gear shift to down first and then pull it others upto you...but dnt end up with broken transmission...try to avaoid these stuff on high revs
take care urself
take care ur car