The push button dual flush system on my Toto toilet is not working

SOURCE: Toto Toilet - no water flow to refill tank after flush

Remove the tank lid and look at the fill valve. Is it a yellow valve?
This fill valve is common on the Toto Toilets and can easliy plug with debrie.

They can be disassmbled and cleaned. however, I usually just replace the valve with Fluid Master Fill valve.
You will also want to check the water coming into the toilet by turning off the water that supplies the toilet and disconnecting the water supply line. After removing the water supply line turn on the water at the valve to make sure that the water is flowing properly. Check the supply line also to make sure it is not plugged.
Be sure and place a small container to catch the water that will come from the valve. A towell will also help from making too much of a mess.
If the Supply line and the valve are clear the problem is in the fill valve.
The G-Max system denotes the Flushiing system which is a 3" flapper that allows the water from the tank to flow into the bowl quicker.
Good Toilets!

sanray

SOURCE: Push Button - Have to Hold Down Button

I had the same problem. The fix cost me 50 cents (literally). I just placed a quarter on top of the Blue and White flush buttons (not sure of the technical terms) inside the tank and now it flushes properly. It seems that the 2 plastic poles the extend from the faux chrome buttons are just a bit too short.
Hope this helps

SOURCE: toto toilet with gmax flushing system blue top

I have the same problem and can not find a solution. The toilet flushes fine but then a delay in filling up the tank occurs. Is there a part I can replace? Does something need to be cleaned or cleared?