Suzuki GSX-R750 Service Manual page 155

C29 (Use of mode select switch)
Step
1 1) Turn the ignition switch OFF.
2) Lift and support the fuel tank. Refer to "Fuel Tank
Removal and Installation in Section 1G (Page 1G-9)".
3) Check the STP sensor coupler (1) for loose or poor
contacts.
If OK, then measure the STP sensor input voltage.
4) Disconnect the STP sensor coupler.
5) Turn the ignition switch ON.
6) Measure the input voltage between the R wire and
ground. Also, measure the voltage between the R wire
and B/Br wire.
Special tool
(A): 09900–25008 (Multi-circuit tester set)
Tester knob indication
Voltage ( )
STP sensor input voltage
4.5 – 5.5 V
((+) terminal: R – (–) terminal: Ground, (+) terminal: R
– (–) terminal: B/Br)
Is the voltage OK?
Action
1
I837H1110061-01
(A)
V
I823H1110062-02
Engine General Information and Diagnosis:
Yes
Go to Step 3.
1A-83
No
• Loose or poor
contacts on the ECM
coupler.
• Open or short circuit
in the R wire or B/Br
wire.