Suzuki GSX-R600 Manual page 167

Step
2 1) Check the continuity between each ISC valve terminal
and ground.
Special tool
(A): 09900–25008 (Multi-circuit tester set)
Tester knob indication
Resistance (Ω)
ISC valve continuity
∞ Ω (Infinity)
(Terminal – Ground)
2) If OK, then measure the resistance (between the Bl wire
terminal "A" and Y wire terminal "B") and (between the G
wire terminal "C" and Br wire terminal "D").
ISC valve resistance
Approx. 80 Ω at 20 °C (68 °F)
(Terminal: "A" – Terminal: "B", Terminal: "C" –
Terminal: "D")
Is the resistance OK?
Action
(A)
I837H1110139-01
(A)
"D"
"B"
"C"
"A"
I837H1110140-01
Engine General Information and Diagnosis:
Yes
If wire is OK,
intermittent trouble or
faulty ECM.
1A-99
No
Replace the ISC valve
with a new one. Refer to
"Throttle Body Removal
and Installation in
Section 1D (Page 1D-
10)".