DAELIM Daystar VL125E Service Manual page 56

7) If the measured voltage is normal,
Check the 'Blue/Yellow' electric wire to see if they have been broken or have short-circuited
or if the wire-harness coupler and the ECU coupler are a bad contact (ECU terminal No. 40)
If there is no problem in the electric wires, ECU is broken
Replace the ECU with new one, it rechecks
8) If the measured voltage is not normal,
Check the Black/Red electric wire to see if they have been broken or have short-circuited.
Check the fuel pump relay.
9) After fault repaired, to erase the memorized fault code in the ECU is refer to how to remove the fault code(5-10).
EMS(Engine Management System)
5-13