HYOSUNG 2010 ST7 Service Manual page 146

4-39 EI SYSTEM DIAGNOSIS
◈ Step 2
1) Turn the ignition switch "ON" position.
2) Measure the injector voltage between YR(NO.1) or
RB(NO.2) wire and ground.
Injector voltage
Tester knob indication : Voltage (
NOTE
Injector voltage can be detected only 3 sec-
onds after ignition switch is turned "ON" posi-
tion.
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 5-4)
Battery voltage
( ~NO.1₩ YR - Ground,
~NO.2₩ RB -
Ground )
B5
(NO.2) connection of
B6
)
Gray
NO.2 NO.1
NO.2
ECU Coupler
NO.1
Black