Auto Calibrate doesn't work properly

I found the problem. It's simple. The problem is because of GND. Because GND signal doesn't reach the limit switches, this error appears.

You will need to check each limit switch and make sure it is returning 0 volts or ground to the Teensy board when the switch is not made and then returns 3.3 when the switch is made. The board inputs are very susceptible to floating voltage so it's important that when the switch is not made that each input pin is getting a solid ground signal.

When the switch is made 1.03 volt returns, but when its not made then returns 0. I didn't understand why returns1.03 despite 3.3v. 🙄

What voltage do you get at the 3.3 volt terminal on your Teensy board when you measure between the Ground Terminal and the 3.3 volt terminal directly at the board?

Normally 3.30V. But when I reboot teensy board by clicking teensy.exe it returns 3.29V.

BTW, this the limit switch I use.

Additionally, there isn't any voltage at the limit switches when the motors not powered. There is voltage (but not 3.3v) only when the motors enabled.

And see limit switches testing. I pushed J1 button of limit switch. it turns 1 and then 0 and repeats like that. Something is wrong. I think the fail is at voltage or GND.

When I measure voltage at the brown and brown with white strip color in the box behind robot, which the cables and motors are connected inner, voltage is 4.06. (I think it should be 3.30v) I tried to unplug GND (brown with white) from teensy board than voltage is 0.96v. It should have been 0, shouldn't it?

do you still get 3.3V on your teensy board? if not then your board is damaged

When you run the limit switch test program do you see all the switches showing 0 or 1 or do they change between those states with nothing moving?