Sym Citycom 300i - Page 84

4. Fuel Injection System
4-38
Continued from previous page
Closed-loop
systems for
mobility
Š O
2
sensor
voltage is
maintained in a
long time within
a certain range
beating
Š O
2
sensor fault
Š ECU fault
Š O
2
sensor
voltage beating
specifications:
100 ~ 900 mV
from the two
groups within
the interactive
beating
NG
YES
Š Use diagnosis
tool to detect of
the manifold
pressure
Engine
vacuum
Š Diagnosis tool
manifold
pressure for
compliance with
specifications?
Š Valve clearance is
not normal
Š Intake system leak
Š Manifold
pressure
Specifications:
32~38 kPa
NG
Normal starting Can not start or starting difficulties
In traditional engine overhaul way to
maintenance
Finish
YES
YES
To this chapter contents
Š Observation O
2
sensor voltage
changes (Standed
motorcycle so that
engine speed
refueling between
4500 to 5500 rpm