HYOSUNG GV250 EI Service Manual page 47

4-1-31 EI SYSTEM DIAGNOSIS
◈ Step 2
1) Connect the IAP sensor couplers NO.1 ① and
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(NO.1) or BY(NO.2) and
GR wires].
IAP sensor
output voltage
Tester knob indication : Voltage (
Is the output voltage OK?
● OB(NO.1), OB(NO.2), BL(NO.1),
BY(NO,2) or GR wire open or
shorted to ground, or poor
(NO.1),
A1
(NO.2) or
G2
YES 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.
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. 3.7 ~ 3.9 V
when ignition switch "ON"
([NO.1] BL - GR,
[NO.2] BY - GR)
(NO.2), (NO.1),
A2 F1
connection of
B4
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
46
①
②
F1
G2
ECU Coupler
A1
A2
B4