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What exactly is going on with the vehicle ??
Ok if the relay is not hot wired and you remove it and reinstall it does it start the car ? ( relay not hot wired )
Ok we have seen a couple common issues try to remove the battery tray and the battery and you will have a couple grounds located under the battery try to remove clean the sounds and check to see if you have eco communication
Do you have power and ground at the ecm?
You will need to get access to the eco under the dash upper panel and unplug the connector and see if you get power to the main big connector and also ground ?