HYOSUNG Aquila GT250 Ej Service Manual page 62

Step 2
1) Turn the ignition switch to the "ON" position.
2) Measure the injector voltage between YL(NO.1 &
NO.2) wire and ground.
Injector voltage
Tester knob indication : Voltage (
NOTE
Injector voltage can be detected only 3
seconds after ignition switch is turned "ON"
position.
Is the voltage OK?
YR(NO.1), RB(NO.2) wire open or
shorted to ground, or poor
(NO.1),
ECU coupler.
If wire and connection are OK,
YES
intermittent trouble or faulty ECU.
Recheck each terminal and wire
harness for open circuit and poor
connection.
Inspect the fuel pump or fuel pump
NO
relay. (Refer to page 79 [4-2-4])
Battery voltage
( NO.1 YL - Ground,
NO.2 YL - Ground )
B5
(NO.2) connection of
B6
)
Gray
61
EI SYSTEM DIAGNOSIS 4-1-44
Black
ECU Coupler