check engine and the fuel gauge dont work,dont appear on the dashboard)

No I did not replace the battery. after a while I connected to terminal again. They stole my ecu with one terminal cable( they cut one block of wires) in the beginning then I bought a new used ecu with one terminal wire cable. I don't if this may happen with the connection or with heat or water, because the ecu was left inside the wood with no proper protection or covered. it may get into contact with some water because I had to drive under the water one time. do you think geting into conatc with water may break it? what do you think?

Yes, contact with the elements may damage it. If it is missing factory covers/protection it will certainly have issues. What is probably going on is that you are using a used ECU that is mated to one key, and an ignition that is mated to another. You probably are locked out because you aren't using the key that ECU expects. When you change the ECU, you have to re-code keys. Also, once you start it, take it in for the latest software updates.