Fuel pump is in constant priming with CEL always on. Car won't start. Cranks, ecu has a hondata S300, but when I turn it to on the ecu fires up with a green light then shuts down right after, if this isnt a forum already I just couldn't find it. B18c5 gsr swapped 97 hatch

 

Constant priming could be because of an altered value in the "Misc" tab of the software regarding the "Priming" period. The CEL being on constantly could be related OR separate. What do you know about the calibration on the Hondata s300 ?

 

So it's nothing in my hondata software, my ecu is having an issue where if I go to to turn the car on the ecu comes active then suddenly dies out.every ground on the car is perfect. Tested from every spot I have grounded on the car it's got a rywire obd1 converted b18c wire harness, it's basically a brand new harness. I've tested the fuel pump through the relay and it works, but the ecu will not stay powered up what so ever.
It's also got the rywire grounding kit in the car as well. I can tell the ecu is fine based off it turn on for a split second. I'm just lost to where my issue is

 

Main relay?

 

Main relay is brand new, I replaced it hoping it was the issue. The the alternator grounded on a sensor wire so I think it is my ecu if it hit the 5v signal

 

Have you cracked the ECU to see if anything's burnt?

 

Might be the ECU.