Suzuki GW250, Руководство по обслуживанию

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FI SYSTEM DIAGNOSIS 4-37
Step 4
IAP sensor check 1
1) Turn the ignition switch OFF.
2) Connect the ECM couplers and IAP sensor coupler.
3) Insert the needle-point probes to the lead wire coupler.
4) Run the engine at idle speed and measure the IAP sensor
output voltage between the Bl/W wire (#1) or W/R wire (#2)
and B/Br wire.

09900-25008: Multi circuit tester set
09900-25009: Needle-point probe set

Tester knob indication: Voltage (

)

IAP sensor output voltage:
Approx. 2.6 V at idle speed (atmospheric pressure:
approx. 100 kPa (760 mmHg)
#1: (
+
terminal: Bl/W –
-
terminal: B/Br)
#2: (
+
terminal: W/R –
-
terminal: B/Br)
Is check result OK?
Step 5
IAP sensor check 2
1) Turn the ignition switch OFF.
2) Remove the IAP sensor. (

4-91)
3) Connect the vacuum pump gauge to the vacuum port of the
IAP sensor.
4) Arrange 3 new 1.5 V batteries
1
in series (check that total
voltage is 4.5 – 5.0 V) and connect
-
terminal to the ground
terminal
B
and
+
terminal to the VCC terminal
A
.
5) Check the voltage between Vout terminal
C
and ground.
Also, check if voltage reduces when vacuum is applied using
the vacuum pump gauge.

09917-47011: Vacuum pump gauge set
09900-25008: Multi circuit tester set

Tester knob indication: Voltage (

)
Is check result OK?
YES Go to Step 5.
NO
• Check the vacuum hoses for crack or damage.
• If vacuum hoses are OK, replace the IAP sen-
sor with a new one. (

4-91)
YES
Replace the ECM with a known good one, and
inspect it again.
NO Replace the IAP sensor with a new one.
V
4
5
760 – 707
707 – 634
634 – 567
567 – 526
100 – 94
94 – 85
85 – 76
76 – 70
3.1 – 3.6
2.8 – 3.4
2.6 – 3.1
2.4 – 2.9
ALTITUDE (Reference)
ATOMOSPHERIC
PRESSURE
OUTPUT
VOLTAGE
mmHg kPa V
0 – 2 000
2 001 – 5 000
5 001 – 8 000
8 001 – 10 000
ft
0 – 610
611 – 1 524
1 525 – 2 438
2 439 – 3 048
m