Engine warning light ECU reset without scanner

I found the engine warning light ON all of a sudden in classis 350 Reborn which continued for two days.
i checked all sensors working good no blown fuse !
so i decided to reset the ECU Manually i dont have scanner.
I have shown the method to reset Engine ecu to delete the fault code without scanner
Caution : MOstly this warning occurs if there any malfunctions in engine sensor of fuel pump , ignition system. so kindly check the fault .