How can I tell if the ECM is getting power?

So, the EEC power relay is what supplies the power to the ECM (red wire) the relay is under the hood. Here are the engine control computer wiring diagrams so you can see how the system works and the location of the EEC relay with a guide on how to test it:

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

and

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Check out the diagrams (below). Let us know what happens and please upload pictures or videos of the problem.