HYOSUNG 2010 ST7, Service Manual

Page: 137 / 298

EI SYSTEM DIAGNOSIS 4-30
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
Approx. 2.7 V at idle speed
( BL - GR)
Is the voltage OK?
YES
NO
If check result is not satisfactory,
replace the IAP sensor with a new
one.
● OB, BL or GR wire open or
shorted to ground, or poor ,
or connection of ECU
coupler.
●
If wire and connection are OK,
intermittent trouble or faulty
ECU.
● Recheck each terminal and wire
harness for open circuit and
poor connection.
Tester knob indication : Voltage ( )
Output voltage
(Input voltage 5 V, ambient temp. 25 °C, 77 °F)
ALTITUDE
(Reference)
(ft) (m) (mmHg) kPa (V)
0
2 000
0
610
760
707
100
94
2 001
5 000
611
1 524
707
634
94
85
5 001
8 000
1 525
2 438
634
567
85
76
8 001
10 000
2 439
3 048
567
526
76
70
ATMOSPHERIC
PRESSURE
OUTPUT
VOLTAGE
Approx.
3.7 ~ 3.9
Approx.
3.3 ~ 3.7
Approx.
3.0 ~ 3.3
Approx.
2.7 ~ 3.0
①
ECU Coupler
Gray Black
B16
B11 B10