This came from a Malaysia webblog, think it was the same youtube guy who posted it. don't remember i saved it i a text file thinking blogsa get taking down all the time. And i don't take credit for this, it was thanks to another guy i have this.
HOW TO RESET AN ECU UNIT ON CBR250R
Follow step below:
1) remove ecu by removing right side fairing.
2) unplug ecu and wait 5 minutes.
3) plug ecu back in and turn engine on for 5 minutes.
rev engine to redline a few times
4) locate wire loom running to tail light
with a piece of wire jump the connection between the blue and green wires
5) with the wires still jumped turn on the ignition.
wait 5 seconds then remove the wire you used to jump the connection
6) your check engine light should now be on (solid), turn ignition off
7) locate and remove coolant sensor. (located above engine under the seat)
8) jump the blue/yellow and green/white wire, with the wires still jumped
turn the ignition on for 10 seconds. the check engine light should now be flashing
9) with the ignition still on plug the coolant sensor back in, turn ignition off
10) turn ignition back on and start engine.
check engine light should come on then go off as it normally does.
rev engine to red line a few times.
11) turn engine off.the ecu is now reset.
(for the best result, reset your ECU before you start a long journey on the highway.)
