Where did you get the relay & have you a photo of its details?
There are different types of 12v relay and also ratings.
Also just to check basics what's the position of this relay on bike?
What's the rating on the fuse blade itself?
When you say bypassed the fan and it's fine, do you mean put 12v direct onto the fan..?
Re tune ecu be sure to order from lonelec site and nowhere else even if it says lonelec cable.
With the check engine light on you're probably gonna need that cable to fix all this.
Or perhaps the rooting around has disturbed something hence the ems light
Tune ecu will also show u engine temp so you can check function/approx calibration of the sensor without having to dig it out
Also
@mexican if he can shed any light on why his went a few times?