The No 2 is the fill plug.
The No 4 is the level check plug.


ATF level check

We start the engine in P (Park) position and wait to reach the temperature to 30-40 Co. Remove the check plug and we must have a continues small flow. If there is no flow we add ATF from the top fill plug until we get the flow we want. Some newer models have a square Allen key plug.

ATF fluid change

If we want to change the ATF fluid, we remove the big bottom plug. Some newer models have a square Allen key plug. If you remove it, into the plug hole you will see an Allen key No 6 that bolts a small tube, take it off and all ATF will comes out. Do not over tight the tube.