My car lost all power while driving, no check engine light when attempting to start

Hello, sorry to hear about this issue. Is this car the 1.8L or 1.8L turbo? And yes if there's no check engine light then most likely the ECM is not active. That's also why you can't communicate with it. Did you find any burnt fuses? And if so which fuse was it?

Okay, this first diagram is a constant feed to the ECM, so hot all the time. The 2nd diagram is ECM power from the main relay and is a white/red wire at the back of the ECM, these must be checked for power with the key on. I am sorry the diagrams aren't newer ones, but this is what we have to work with. The 3rd and 4th diagrams are a little more clear. Make sure the ECM is receiving power on these circuits. Checking that Main Relay is one of the first things to do.

Okay, so you have a wire shorting out to ground somewhere. How many amps is the ECM fuse rated at? And is the fuse labeled ECM or engine? The reason I ask is I see a 15a engine fuse, wondering if that's the ECM fuse.

Okay, from the diagram I see that this 15a engine circuit also powers the oxygen sensors heater circuit, so next go and unplug both oxygen sensors and see if that fuse still blows. I realize that you are going through a lot of fuses, but without a circuit breaker in there, there's no other way to check this.

So the engine fuse isn't blowing now? With the key on?

Well, for now I was just trying to find the short that popping that fuse. So the fuse does blow if you try to start the car? Finding the short is first priority because it powers up part of the ECM.

That means you may have moved the shorted wire while you were plugging the 02's back in. Check the wiring harness for the 02's around the exhaust and exhaust manifold. Where ever the harness runs along the frame or exhaust, you may find a metaled part of the harness.

Here is the wiring diagram for these circuits:

Okay, so as of right now, you have a crank but no start and check engine light not coming on when you turn the key to run position. I'm going to pull up all the necessary wiring diagrams and I'll talk you through all the testing procedures. Do you have a test light and multi-meter? We have to get that ECM powered back up. But in the meantime take a good close look at the fuse box that the 15 amp engine fuse is in, make sure there's no corrosion on the back side of that fuse panel. I've seen many fuse/relay boxes with corrosion under the box that's not visible from up top causing all kinds of problems, check that while I get all the wiring diagrams ready. You should be able to unbolt the fuse box and see underneath. You're going to have to locate the ECM as well because we're going to be doing some testing at the ECM harness plug. One other check I need you to do is at the oxygen sensor, either one, with the key on check the black/white wire for 12 volts. This is the heater circuit for the oxygen sensor. One other check, with the main relay removed, 2 of the pins should have 12 volts present.

Here are the diagrams for all the circuits related to Engine Fuse 15 amp. But the first thing I need you to do is the last diagram that reads about checking the TPS for 5 volts, this is very important. Then go to the 6th diagram is where you need to check that the ECM is being powered up, You will have to back probe the connector and see if 12 volts is present. With the way the fuse keeps blowing and then not blowing, it sounds like you have wires either touching metal at some contact point with the frame or you have wires that have melted together. But check the ECM for power first. As you can see from the 2nd diagram, that Engine Fuse also powers up the ignition coils among other things. Also the ROOM fuse 10 amp powers up the ECM as well, so when checking the fuses make sure the fuse has power on both sides of it.

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester
https://www.2carpros.com/articles/how-to-check-wiring
https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit
https://www.2carpros.com/articles/how-to-check-a-car-fuse
Let me know what you find, make sure to check the back of the fuse panel as well for corrosion.