W900 n14 celect

I need help with my n14 problem is that once truck reaches 180 degrees truck will derate will not go above 1500 rpms if you stop and let the truck cool down then it will run fine again and as soon as it gets to 180 degrees will loose power again I already change the intake temp sensor the water temp sensor, throttle position sensor, bypass the heat exchanger, bigger fuel filter and shutoff solenoid and still does the same thing. Also mechanic wasn’t able to find the diagnostic plug on the truck does any one know the location of it. Thank for the help

 

I have not check the voltage going to water temp sensor do you know how much should it be getting ?

 

I will check voltage tomorrow to see if I am getting 5v thank you

 

I already check that filter and is clean

 

I am waiting to pick up my truck from mechanic so I can check voltage on temp sensor as soon as I know something knew I will keep you guys in the loop thanks