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Realisitcally speaking you need a scan tool if you want to troubleshoot this engine on your own. Did you have any kinds of questions that I could help you with?
I wouldn't swap ECM's until you've at least hooked a scan tool up to it. The reason being is lets say this one is worst case scenario and the engine has some kind of short circuit in the harness that has shorted and ruined the ECM as well, if you swap ECM's you could end up frying that ECM as well. You would be sitting there with 2 friend ECM's. It is one of those once in a blue moon type of scenario's, but I have seen shorts in harness's fry ECM's. So I would not personally do it.