Well, after a bunch of testing it seems my fuel pump went south. The ECM, relays, fuses, sensors, all seem to be ok.
I suspect, when the fuel rails and lines there went empty and was just air after install, when the pump cam on it has no liquid resistance and probably took a dump. I can run the pump manually and some fuel come out of the fuel line, but it's not 50psi. It also sound funny when the pump is running. I am now in a project to replace the pump. But get this, there's a access panel under rear carpet BUT NOT BIG ENOUGH TO REMOVE PUMP THROUGH! Yeah, I am not dropping the tank, just gonna cut open what's needed and TIG it back into place.
With Toyota, the ECM code will not engage C/OPN relay until the ECM gets the START (starting) signal AND signal from crank sensor. Once the engine is running (I assume a rpm threshold) the ECM will keep C/OPN relay energized, which feeds the pump selector relay, etc.
And just to note, I am not mechanic by trade, I just a DIY'er with a lot of tools
