Best trick I have learned on these is tap all of the relays with a sharpie a few times to see if they are magnetized/stuck, sometimes you will tap them and find one that will make the car run, replace it. Then close doors and open the stop switch and use the setup tool to go the test output screen and hit enter a bunch of times to cycle all of the rows, make sure all of the output lights turn on and off. Exit to the menu screen then let it run.

Be careful with the tool, you can erase the programmed values if you hit the wrong menu.

I have found the "sharpie tap-tap" trick works to find magnetized relays and the output test somehow resets the processor. I have a feeling the processor runs a couple of programs position, inputs, outputs, etc. and one of them will lock up and stop the car.

Replacing the battery with a bigger one is a good idea also.