Suzuki VL800 Service Manual page 571

Check 3
1) Click the button 1 and increase the "Spec" 2 to 1 400 rpm
slowly.
2) Check that the "Desired idle speed" 3 is nearly equal to the
"Spec" 2. Also, check that the number of steps 4 in the ISC
valve position increases
Check 4
1) Click the button 1 and increase the "Spec" 2 to 1 00 rpm.
2) Check that the "Desired idle speed" 3 is approx. 1 700 rpm.
3) Check that the "Engine speed" 4 is close to 1 700 rpm.
NOTE:
Be careful not to increase the "Spec" to more than 1 800rpm, or
the "Engine speed" may reach the upper limit.
If the ISC valve does not function properly, replace the ISC valve or inspect the ISC valve. (Page 18-53)
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VL800/C/TK9 ('09-MODEL) 18-31