HYOSUNG MS3 250 Sercie Manual page 120

4-23 FI SYSTEM DIAGNOSIS
◈ Step 2
1) Connect the IAP sensor coupler.
2) Insert the needle pointed probes to the lead wire
coupler.
3) Start the engine at idle speed.
4) Measure the IAP sensor output voltage at the wire
side coupler (between BL and BW wires).
IAP sensor
when ignition switch "
output voltage
Tester knob indication : Voltage (
Is the voltage OK?
● OB, BL or BW wire open or
shorted to ground, or poor � , �
or ⑤
● If wire and connection are OK,
YES
intermittent trouble or faulty ECU.
● Recheck each terminal and wire
harness for open circuit and poor
connection.
If check result is not satisfactory,
NO
replace IAP sensor with a new one.
(Input voltage 5 V, ambient temp. 25 °C, 77 °F)
ALTITUDE
(Reference)
(ft) (m)
0 0
2 000 610
2 001 611
5 000 1 524
5 001 1 525
8 000 2 438
8 001 2 439
10 000 3 048
Approx. 4.0 ~ 4.2 V
" (ON)
( � BL - � BW )
connection.
Output voltage
ATMOSPHERIC
PRESSURE
(mmHg)
760
707
707
634
634
567
567
526
)
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OUTPUT
VOLTAGE
kPa (V)
100
Approx.
4.0 ~ 4.3
94
94
Approx.
3.6 ~ 4.0
85
85
Approx.
3.3 ~ 3.6
76
76
Approx.
3.0 ~ 3.3
70
⑤
ECU Coupler
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