Sym Citycom.300i, Service Manual

Page: 62 / 270

4. Fuel Injection System
4-16
Throttle Body
Throttle valve positioning screw
Functional Description:
●
Throttle body is the inlet air flow regulating device (similar to the
carburetor).
●
Throttle valve pivot drives the throttle position sensor synchronously
and makes ECU detect the throttle opening immediately.
●
Throttle valve positioning screw has been adjusted and marked on the
production line. Readjustment is not suggested.
Treatment of abnormal phenomena:
●
If all fuel injection associated components identified no adverse, and
other traditional engine components are also normal, the engine is still
not smooth, please confirm whether the throttle body coke serious.
●
If coke serious, please clean throttle body, and then adjust the injection
system.
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