HYOSUNG Aquila GT250 Ej, Service Manual

Page: 53 / 122

52
4-1-35 EI SYSTEM DIAGNOSIS
Step 2
1) Connect the IAP sensor coupler .
2) Insert the needle pointed probes to the lead wire
coupler.
3) Turn the ignition switch to the “ON” position.
4) Measure the IAP sensor output voltage at the wire
side coupler (between BL and GR wires).
IAP sensor
output voltage
3.3 ~ 4.3 V
[ When ignition switch “ON” ]
( BL - GR)
Is the output 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
ECU Coupler
Gray Black
B16
B11 B10