HYOSUNG GV250 EI Service Manual page 56

◈ Step 2
1) Turn the ignition switch "ON" position.
2) Measure the injector voltage between YR(NO.1),
RB(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) or RB(NO.2) wire open
or shorted to ground, or poor
(NO.1) or
of ECU coupler.
YES
● If wire and connection are OK,
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 4-2-4)
Battery voltage
([NO.1] YR - Ground,
[NO.2] RB - Ground)
)
L1
(NO.2) connection
L2
L1
L2
55
EI SYSTEM DIAGNOSIS 4-1-40
NO.1
NO.2
ECU Coupler