Suzuki GSF1250 Service Manual page 161

Step
1 1) Turn the ignition switch OFF.
2) Check the ISC valve coupler for loose or poor contacts.
If OK, then check the ISC valve lead wire continuity.
3) Disconnect the ISC valve coupler and ECM coupler.
Refer to "ECM Removal and Installation in Section 1C
(Page 1C-1)".
4) Check the continuity between terminals "A" and "49",
terminals "B" and "36", terminals "C" and "48", terminals
"D" and "35".
Special tool
(A): 09900–25008 (Multi-circuit tester set)
(B): 09900–25009 (Needle pointed probe set)
Tester knob indication
Continuity test (
"B"
"A"
(B)
Is the continuity OK?
Action
)
"C"
"D"
"35"
"36"
"48" "49"
Engine General Information and Diagnosis:
Yes
Go to Step 2.
I718H1110208-02
(A)
I718H1110209-03
1A-92
No
Lbl, W/Y, Dgr or Lg wire
open.