Sym MAXSYM 400i Service Manual page 57

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4. Fuel Injection System
Air Injection Solenoid Valve (AISV)
Function
AISV introduces appropriate air quantity to reduce pollutant emission.
Basic Principle
When the engine RPM and throttle opening are higher than the default value, ECU controls AISV opening
or closure.
Fresh air
ECU
Power relay
AISV
Reed valve
Battery
Power relay
Air Injection
Solenoid Valve
ECU
4-12