HYOSUNG 2010 ST7 Service Manual page 137

Step 2
1) Connect the IAP sensor coupler ①.
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 GR wires).
IAP sensor
output voltage
Tester knob indication : Voltage (
Is the voltage OK?
● OB, BL or GR wire open or
shorted to ground, or poor
or
B11
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.
If check result is not satisfactory,
replace the IAP sensor with a new
NO
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. 2.7 V at idle speed
( BL - GR)
B16
connection of ECU
B10
Output voltage
ATMOSPHERIC
PRESSURE
(mmHg)
760
707
707
634
634
567
567
526
)
,
OUTPUT
VOLTAGE
kPa (V)
100
Approx.
3.7 ~ 3.9
94
94
Approx.
3.3 ~ 3.7
85
85
Approx.
3.0 ~ 3.3
76
76
Approx.
2.7 ~ 3.0
70
EI SYSTEM DIAGNOSIS 4-30
Gray
ECU Coupler
①
Black