C43 " " Oxygen Sensor Heater Circuit Malfunction - HYOSUNG GV250 EI Service Manual

4-1-43 EI SYSTEM DIAGNOSIS
"C43" OXYGEN SENSOR HEATER CIRCUIT MALFUNTION
C43
DETECTED CONDITION
Oxygen sensor heater signal is not inputted in ECU.
▣ ▣ INSPECTION
1) Remove the frame cover.
2) Turn the ignition switch "OFF" position.
3) Check the Oxygen sensor heater coupler for loose
or poor contacts.
If OK, then measure the Oxygen sensor heater
voltage.
4) Disconnect the coupler and then turn the ignition
switch "ON" position.
5) Measure the voltage between OB wire terminal
and B (or ground) wire terminal.
Oxygen sensor
heater voltage
Tester knob indication : Voltage (
Sensor side
GR BR
Is the voltage OK?
● OB or B wire open or shorted to
ground, or poor
connection of 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.
Replace the Oxygen sensor with a
NO
new one.
CODE
[
Battery voltage
( OB - B )
( OB - Ground )
)
Heater side
B OB
or
C3 H1
4 3 4
POSSIBLE CAUSE
● Oxygen sensor, Oxygen sensor heater circuit open
or short.
● Oxygen sensor, Oxygen sensor heater malfunction.
● ECU malfunction.
58
CODE
3 ]
H1
C3
ECU Coupler