I'm trying to modify my tune (which I've done before) and when I go to the first "Turn ignition on" step, it says that it did not read that and it asks if I have a performance module installed. So, just out of curiousity, I wanted to check the ecm to see if it has one already in it (bought the car used). Where is the ecm located and has anyone else had this problem with their Diablo?