It depends on which transmission you have.
If you've got a manual, check out this link: http://www.mr2ownersclub.com/online_parts_catalog/1988transaxleservice.pdf
If you've got an automatic, check out this link:
http://www.mr2ownersclub.com/online_parts_catalog/1988autotransaxleservice.pdf
The pages include instructions for finding the drain plugs and the fill plugs. Note that you don't just "pour the fluid in"; you'll have to pump it into the fill hole. For some cars, you can get creative with a long-tube funnel and pour it from the top. The easiest way to do it is to get a MityVac, or a similar too.
There's several sub-models of transmissions, so make sure you know exactly which one you have before you get started.
How many quarts of automatic transmission fluid does the 2001 Toyota Avalon automatic transmission hold?
2 Quarts
3.7 quarts to replace for Toyota sienna.
12 qrts of Toyota Type IV
The 1997 Toyota 4-Runner automatic transmission requires: 2.2 quarts of fluid if it's a 4WD 1.7 quarts of fluid if it's a 2WD The recommended fluid type is Dexron III (or Toyota T-IV)
4
4 quarts
The 1993 Toyota came available in the A131L and A245E automatic transmissions. The service fill capacity of the A131L is 5.1 quarts and the A245E 8 quarts.?æ
2.5 quarts on just a drain and fill. 6.9 quarts on a dry unit
if its a 4 cylinder, 4 and a half quarts
8.2 quarts
A 1999 Lexus GS300 requires 2.0 quarts of automatic transmission fluid. Factory recommendation is Toyota T-IV ATF.