Sym HD2 125 Service Manual page 75

5. Fuel Injection System
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 stablize the idle speed.
5-12
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ECU
ISC
Battery
N
S
S
N
Vb
N
S
Va