I am trying to allow the E38 to turn on the cooling fans when the AC pressure reaches a certain psi. The vehicle is a conversion and the OS is a 2011 Silverado 6.2. The tables are present in the System:Fans portion of the tune, but I am not having any luck having a scantool see the valid signal in the ECM. Is there a possibility that the OS is inhibiting this function? The wiring diagram shows pin 12 is the pressure signal, pin 13 is the lo reference, and pin 34 is the 5V reference. I am lost as to why this will not work. I have attached the tune for anyone to look at. Any help is appreciated. Thanks!
2011 Silverado 6.2.ctz