Sym MAXSYM 400i Service Manual page 54

Idle Speed Control Valve (ISC stepper motor)
+Va
-Va
+Vb
-Vb
Step
Function
ECU controls ISC stepper motor to adjust the bypass intake air quantity and stabilized the idle speed.
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ECU
4. Fuel Injection System
ISC
Battery
N
S
S
N
N
S
Va
Vb
4-11