There is no breakout box permanently installed in our cars. The closest thing to it would be EEC connector itself. A breakout box is a connectors that would install between the harness and the EEC that effectively "taps" all the connections going to the EEC. Those "taps" run out to a box that is designed to allow you to take either milti-meter readings or logic probe readings from. The picture below will give you an idea of what a breakout box might look like for our EEC. I have not seen one that was specifically designed for our computers but I also have never looked for one either.