Can't fire up. Buzzing from the relay, lamps blinkin- HELP

[Red]

Ivan-
"but to me it proves that the ECU did diagnosis without the engine running " I never said the ECU couldn't get engine codes with the engine not running. Part of the reason for engine codes is to tell you why an engine might not BE running. Plugging in wrong connectors is more problematic, that can fry things, probably including the ECU.

Personally I've never me a "silent" fuel pump, I can always hear or feel it running unless there is a lot of background noise or I'm in a very upscale car. But then again, I have the ears of a bat. True, you can't be sure you are getting fuel pressure just from the buzz of a motor.

I don't like cracking open fuel lines unless they must be opened. Sometimes, the fittings fail. Sometimes the fuel catches fire. Not often but once is enough to ruin your day <G> so I prefer not to open fuel lines.

From the voltage he is showing at the EFI main fuse, which should not be there, and the relay buzzing, there is no reason to suspect a fuel pump failure until after the other electrical questions have been addressed.

Running power directly to the pump and watching to see fuel actually get pumped, is a good idea, but at this point I would call it a distraction unless there was some reason to think it had not been working in the past. Which wasn't mentioned here.