Suzuki GSF1250 Service Manual page 127

Step
3 1) Connect the ECM coupler.
2) Turn the ignition switch ON.
3) Insert the needle pointed probes to the lead wire coupler.
4) Measure the input voltage at the R wire and ground with
the needle pointed probes.
If OK, the measure the input voltage at the R wire and B/
Br wire.
Special tool
(A): 09900–25008 (Multi-circuit tester set)
(B): 09900–25009 (Needle pointed probe set)
Tester knob indication
Voltage ( )
IAP sensor (No.2) input voltage
4.5 – 5.5 V
((+) terminal: R – (–) terminal: Ground, (+) terminal: R
– (–) terminal: B/Br)
Is the voltage OK?
Action
(A)
(B)
I718H1110180-03
Engine General Information and Diagnosis:
Yes
Go to Step 4.
1A-58
No
Open or short circuit in
the R wire or B/Br wire.