HYOSUNG AQUILA 650 FI Service Manual page 38

◈ Step 2
1) Connect the IAP sensor coupler NO.1 ①
NO.2 ② .
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(NO.1), BY(NO.2) or GR
wire open or shorted to ground,
or poor � , � (NO.1), � (NO.2)
or
59
YES
● If wire and connection are OK,
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. 2.7 V
at idle speed
( � BL - �
GR )
connection.
Output voltage
ATMOSPHERIC
PRESSURE
(mmHg)
760
707
707
634
634
567
567
526
and
①
)
59
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
37
FI SYSTEM DIAGNOSIS 4-1-26
②
�
�
�
ECU Coupler