"C17" Iap Sensor Circuit Malfunction - HYOSUNG MS3 250 Sercie Manual

"C17" IAP SENSOR CIRCUIT MALFUNCTION

DETECTED CONDITION
IAP sensor voltage is out of the specified range.
0.1 V � Sensor voltage �
NOTE :
Note that atmospheric pressure varies depending on
weather conditions as well as altitude.
Take that into consideration when inspecting voltage.
▣ ▣ 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 IAP sensor coupler for loose or poor
contacts. If OK, then measure the IAP sensor
input voltage.
4) Disconnect the IAP sensor coupler.
5) Turn the ignition switch "
6) Measure the voltage at the OB wire and ground. If
OK, then measure the voltage at the OB wire and
BW wire.
IAP sensor input
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 OB
wire or BW wire.
4.8 V
" (OFF) position.
" (ON) position.
4.5 ~ 5.5 V
( � OB - �
Ground )
( � OB - �
BW )
)
POSSIBLE CAUSE
● Clogged vacuum passage between throttle body
and IAP sensor.
● Air being drawn from vacuum passage between
throttle body and IAP sensor.
● IAP sensor circuit open or shorted to ground.
● IAP sensor malfunction.
● ECU malfunction.
FI SYSTEM DIAGNOSIS 4-22