Suzuki GSX1400 Service Manual page 163

4-44 FI SYSTEM
Yes
3
Turn the ignision switch OFF.
Connect the STP sensor coupler.
Insert the copper wires to the lead wire coupler.
Disconnect the STVA lead wire coupler.
Turn the ignition switch ON.
Measure the STP sensor output voltage at the coupler (be-
tween Yellow and Black wires) by turning the secondary
throttle valve (close and open) with a finger.
STP sensor output voltage
Throttle valve is closed:
Throttle valve is opened: Approx. 4.0 V
09900-25008: Multi circuit tester
Tester knob indication: Voltage (
No
Yes
Yellow or Black wire open or shorted to ground, or poor d or X
connection. ( 4-22)
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)
www.GSX1400FE.com
2
Approx. 0.8 V
)
If check result is not satisfactory,
replace STP sensor with a new one.
Replace the ECM with a new one,
and inspect it again.
2
3
Black
Yellow
3
3
ECM coupler