I am getting two different error messages depending on what I do. If I hit the Read button, it confirms the TIU is connected, no AIU found as I don't have one, and says "No Active DCS Engines".
If I follow the steps above thru the add engine feature in the menu and select Add MTH Engine, I get an error message which states "No Engine to Add".
And to confirm this is with the Z500 connected thru Fixed1 Input, no other cars on the track and the Diesel engine sitting on right on the section with the lockon/power.
Haven't tried conventional mode yet. Will run into the other room and try that and reply back.