Suzuki GSX-R750, Service Manual

Page: 184 / 495

FI SYSTEM AND INTAKE AIR SYSTEM 4-37
Ground
Vout
Vcc
1.5V battery
(4.5V in total)
Remove the IAP sensor.
Connect the vacuum pump gauge to the vacuum port of
the IAP sensor.
Arrange 3 new 1.5 V batteries in series (check that total
voltage is 4.5 – 5.0 V) and connect
-
terminal to the
ground terminal and
+
terminal to the Vcc terminal.
Check the voltage between Vout and ground. Also, check
if voltage reduces when vacuum is applied up to 40 cmHg
by using vacuum pump gauge. (See table below.)
09917-47010: Vacuum pump gauge
09900-25008: Multi circuit tester
Tester knob indication: Voltage ( )
No If check result is not satisfactory,
replace IAP sensor with a new
one.
Yes
Red, G/B or B/Br wire open or shorted to ground, or poor
h
,
n
or
r
connection. ( 4-25)
If wire and connection are OK, intermittent trouble or faulty ECM.
Recheck each terminal and wire harness for open circuit and
poor connection. (
4-4)
Replace the ECM with a new one,
and inspect it again.
3 3
Output voltage (Vcc voltage 4.5 – 5.0 V, ambient temp.
20 – 30°C, 68 – 86°F)
ALTITUDE ATMOSPHERIC OUTPUT
(Reference) PRESSURE VOLTAGE
(ft) (m) (mmHg) kPa (V)
0 0 760 100
   
3.1 – 3.6
2 000 610 707 94
2 001 611 707 94
   
2.8 – 3.4
5 000 1 524 634 85
5 001 1 525 634 85
   
2.6 – 3.1
8 000 2 438 567 76
8 001 2 439 567 76
   
2.4 – 2.9
10 000 3 048 526 70
ECM couplers