Suzuki GSX1400 Service Manual page 159

4-40 FI SYSTEM
3
Remove the AP sensor.
Connect the vacuum pump gauge to the air passage port
of the AP 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:
No
Yes
Red, G/Y or B/Br wire open or shorted to ground, or poor 0, G
or X connection. (
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)
OUTPUT VOLTAGE (VCC VOLTAGE 4.5 – 5.0 V, AMBIENT
TEMP. 20 – 30°C, 68 – 86°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
Voltage ( )
If check result is not satisfactory,
replace AP sensor with a new one.
4-22)
Replace the ECM with a new one,
and inspect it again.
ATMOSPHERIC
PRESSURE
(mmHg) kPa
760 100
 
707 94
707 94
 
634 85
634 85
 
567 76
567 76
 
526 70
www.GSX1400FE.com
3
OUTPUT
VOLTAGE
(V)
3.4 – 4.0
2.8 – 3.7
2.6 – 3.4
2.4 – 3.1
ECM couplers