My Tracker was acting funny and bogging. I thought it may have been a fuel pump. Since then, it has gone from barely idling to not starting at all. I checked for spark at the plugs and there doesn't seem to be any. It showed a 0630 code a few times which is some weird VIN thing. Most of what I've seen about this code says something has gone haywire in the ECU and just replace it. Does anyone have any information on testing the ECU to verify the problem?