HYOSUNG AQUILA 250 FI, Service Manual, Page: 35 / 90

34
4-1-25 FI SYSTEM DIAGNOSIS
◈
Step 2
1) Turn the ignition switch “OFF” position.
2) Measure the IAT sensor resistance.
Is the resistance OK?
YES
NO
ECU Coupler
⑤
�
Resistance Intake Air Temp.
IAT sensor resistance
Approx. 53.30
㏀
Approx. 31.52
㏀
Approx. 12.33
㏀
Approx. 5.19
㏀
Approx. 2.42
㏀
-10
℃
(14
℉
)
0
℃
(32
℉
)
20
℃
(68
℉
)
40
℃
(104
℉
)
60
℃
(140
℉
)
Tester knob indication : Resistance (
㏀㏀
)
●
Lg or BW wire open or shorted to
ground, or poor
�
or
⑤
connection.
●
If wire and connection are OK,
intermittent trouble or faulty ECU.
●
Recheck each terminal and wire
harness for open circuit and poor
connection.
Replace the IAT sensor with a new
one.