"C21" Iat Sensor Circuit Malfunction - HYOSUNG MS3 250 Sercie Manual

"C21" IAT SENSOR CIRCUIT MALFUNCTION

DETECTED CONDITION
Output voltage is out of the specified range.
0.1 V �
Sensor voltage < 4.6 V
▣ ▣ INSPECTION
◈ Step 1
1) Lift and support the side cover with the side cover
stay. (Refer to page 2-2)
2) Turn the ignition switch "
3) Check the IAT sensor coupler for loose or poor
contacts.
If OK, then measure the IAT sensor voltage at the
wire side coupler.
4) Disconnect the coupler and turn the ignition switch
" " (ON) position.
5) Measure the voltage between Lg wire terminal and
ground.
6) If OK, then measure the voltage between Lg wire
terminal and BW wire terminal.
IAT sensor voltage
Tester knob indication : Voltage (
Is the voltage OK?
YES Go to Step 2.
● Loose or poor contacts on the
ECU coupler.
NO
● Open or short circuit in the Lg
wire or BW wire.
" (OFF) position.
4.5 ~ 5.5 V
( � Lg - �
Ground )
( � Lg - �
BW )
)
POSSIBLE CAUSE
● IAT sensor circuit open or short.
● IAT sensor malfunction.
● ECU malfunction.
FI SYSTEM DIAGNOSIS 4-24