you can take the battery down to super cheap auto and they do a free battery test with a full print out.
I had the same issue in my S15 back in the day. Turns out the battery randomly dropped a cell on the negative terminal side which lead me to think it was an earthing issue.
From memory the ECU doesnt have a "relay" just a fuse, what your hearing might be the starter relay or the tick might be the solanoid on the starter triggering. (possibly the fuel pump relay too however it doesnt sound like a fuel issue here)
easiest thing to do is test the battery as its free and costs nothing then if that checks out go from there.
Gotta love cars
1 problem could be caused by 100 different things
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