Thanks for reply

I checked battery level and didn´t drops down after key switch on. Neither any of the controllers went on because none of them receive any supply, just the MCU goes on but showing no error.

I noticed that small PCB board installed on the top of the MCU is the one in charge of suplying 36V to traction/hyd controllers through its PCB relays conmutation. I checked and detected 3 circuit lines open and restored them, re-test and again the same problem.
Now I also detected that aditional circuit line in the PCB from a PTC thermistor to MCU input was open, I will restore it and check again.
One question on these Toyota models what´s the nominal working voltage for the battery pack?. Curtis says from 31.4 to 37.6 and right now my battery is at 35.4V.
This question is because even when nothing is happening at the forklift and any controller is going on, basically because MCU is not putting activation signal: +-36 on the top PCB board for relays actaution. Battery level displayed is at minimun.

Also where is FU10?. I just have FU5-8 at the PCb board and the power fuses at the contactors output (MPC/STR)

Is there any way that the MCU not detecting PTC value determine to not initialize anything?

Best regards