Suzuki GSF650A Service Manual page 106

1A-31 Engine General Information and Diagnosis:
C13 (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 IAP sensor coupler for loose or poor contacts.
If OK, then measure the IAP sensor input voltage.
4) Disconnect the IAP sensor coupler.
5) Turn the ignition switch ON.
6) Measure the voltage at the B wire and ground.
If OK, then measure the voltage at the B wire and B/Br
wire.
Special tool
(A): 09900–25008 (Multi-circuit tester set)
Tester knob indication
Voltage ( )
IAP sensor #1 input voltage
4.5 – 5.5 V
((+) terminal: B – (–) terminal: Ground, (+) terminal: B
– (–) terminal: B/Br)
Is the voltage OK?
Action
I718H1110159-01
(A)
I718H1110160-03
Yes
Go to Step 4.
No
• Loose or poor
contacts on the ECM
coupler.
• Open or short circuit
in the B wire or B/Br
wire.