HYOSUNG 2010 ST7, Service Manual

Page: 146 / 298

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.
NOTE
Injector voltage can be detected only 3 sec-
onds after ignition switch is turned “ON” posi-
tion.
YES
NO
●
YR(NO.1), RB(NO.2) wire open or
shorted to ground, or poor
(NO.1), (NO.2) connection of
ECU coupler.
● 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
relay. (Refer to page 5-4)
Is the voltage OK?
Injector voltage
Battery voltage
( ~ NO.1 ₩ YR - Ground,
~
NO.2
₩
RB - Ground )
NO.2 NO.1
NO.2
NO.1
Tester knob indication : Voltage ( )
ECU Coupler
Gray Black
B5
B6