There are many reasons. Take it to a trans shop.
One of the nice features of the Echo is that it has a transmission fluid filter. This means you may never need to change the transmission fluid (it is not listed at all in the owner's manual scheduled maintenance). If you feel that it really does need it because you have not driven under normal conditions, you can find details on how to do it, here: http://groups.msn.com/Sorensonbrian/atfchange.msnw
A CVT is a type of automatic transmission that is very different from normal auto transmissions. CVT stands for Continuously Variable Transmission. The theory behind CVT is that there are infinite gear combinations. There are no set "gears". What I mean by this is your normal auto transmission will have 3,4, 5 up to 8 specific gears. The transmission finds the right gear and then move up or down to the next set gear depending on your driving needs. Regardless of how smooth an automatic transmission is there will still be a momentary loss of power when the gears shift. Not so in a CVT CVT's have no set gears. They start a high ratio to get you started and then roll along a cone "continuously" changing the ratio, with no power loss and "infinite" combinations, giving fuel economy increases and super smooth acceleration. The downside to CVT is the add weight.
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