Quote Originally Posted by Rustyj2022 View Post
AC low-pressure sensor has been replaced with an new OEM one.

Is there a way to check the PCM to see if it is bad or not sending a signal?
Yes, scan tool data, but you need more than a generic scan tool.

Put up the AC data, and see what PCM is seeing.

Many relays are part (built onto) the PDC; the wiring diagram will note in PDC, but you replace it, assume it's good.

Do you have any codes in the system or network codes?