Would hold back on the ECU failure first. My thoughts are if no scan tool can communicate then the ECU may well not be fully powered up. When the key is on engine not running have you got the engine managment light coming on during bulb check?
If not then look closley at all ECU power feeds, switched power feeds and all grounds. Check grounds under load ie when cranking. With key on check any 5v refrenced component MAF, CTS TPS to see if you have a 5v refrence voltage, if not ECU is not powering up.
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