I hope someone can assist me

Im currently working on 2x trane RAUJC60E units .. and at pressent they aint responding to a thermastat call for cooling . having checked and double checked we have traced the electrical circuit back to the high pressure sensor in one unit and the low prssure sensor in the other?? there are no broken wire on the sensors and I have replaced one sensor with a new one.. and still the problem, again through the circuit shows it is the sensors in both units..are not allowing the breakers to pull in?. can you advise on how I can equal the presure ? resolve !!! so it will start the compressors?

any advise will be gladly accepted..
regards
darren