I found this extensive amt of info abt the operation and improvement for a vehicle PCM, not specific to the Durango or Dodge family, but hopefully educational and helpful to us all who are experiencing problems with our PCM.
it was a free download so hopefully no copyright issues.
https://www.google.com/url?sa=t&source=web&rct=j&url=http://www.ti.com/lit/szzy013&ved=2ahUKEwjBtYeM9OrnAhUDsJ4KHUnOCLgQFjAKe gQIARAE&usg=AOvVaw1eq1UPQW7zbxyOj7QQPUHt