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8th Gen car crank no start unless I manually ground PGM-FI Main relay


New Member
hi all
i have a honda civic 2008 and I did an engine swap. first day the mechanic call me and test the new engine all things works well and on the next day he continue getting the rest of the car roundup and then the car didnt start (crank but no start). i saw that the engine was not getting any power and i assume it is ground issue. so me and the mechanic follow all the 3 main grounds and make sure that all are cleaned up and connected (especially the hidden one on the left side of the engine). but we couldn't get the car to start. finally, we could start it by grounding the R7 relay directly.
i try to download the wiring diagram to see from where the ground comes to the PGM-FI Main relay with no success.
any ideas??
where to check ??