Sym RV 250i User Manual

4. Fuel Injection System
4-37
Integrated Troubleshooting Procedure
Checking,
adjusting
Project
● Use meter direct
measurement
battery voltage
● Use diagnosis
tool detection
battery voltage
Fault reasons Fault status
determination
Parts specifications
Battery
voltage
Detection of
maintenance projects
and steps
● Battery electricity
● Battery connector
loose
● Harness circuit
opening
● ECU coupler not
connected properly
● Battery voltage
is 10 V above?
● Diagnosis tool
show whether
the voltage of 10
V above?
● Diagnosis tool
display voltage
required to
achieve more
than 10 V
NO
YES
● Diagnostic tool
show whether or
not a fault code?
● Fault Code
cleared after
show again?
● TPS fault
● ETS fault
● CPS fault
● MAP fault
● O2 sensor fault
● ROS fault
● ECU fault
● The sensor
detection
methods and
specifications,
please refer to
repair manual
YES
● Use of the
diagnosis tool
detection fault
code
● Elimination of
fault codes, and
then start engine
Diagnosis
fault code
inspection
NO
● Injector whether
injection?
● Injector spray
angle is normal?
● Fuel pressure
enough?
● Removed the
injector on the
intake manifold,
but not removal of
harness coupler.
(Injector and
injector cap tightly
by hands, fuel
spills should not
be the case)
● Start the engine
● Examine whether
injector fuel
injection
● Between the tank
and injector
installation the
pressure gauge
● check fuel
pressure
adequacy
Fuel
quantity and
fuel
pressure
● less than fuel tank
● Injector fault
● Fuel pump relay
fault
● Fuel pump fault
● ECU fault
● Fuel pump filter
obstructive
● Pressure fuel
specifications:
Open the main
switch three
seconds after
but not start
engine →more
than 250 kPa
Idle →
294±6kPa
● Injector
resistance
specifications:
11.7±0.6Ω
NO
YES
● Removed the
spark plug from
the cylinder
head, but then
power lines still
ring
● Start the engine
● check spark plug
sparks
Ignition
situation
● Examine
whether the
spark plug
ignition?
● Check spark
plug sparks
strength is
normal?
● Spark plug fault
● Roll over sensor
fault
● ECU fault
● Ignition coil fault
● Crankshaft position
sensor fault
● Spark plug
specifications:
NGK-CR8E
Continued next page
YES
NO
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Sym RV 250i Specifications

General

Brand	Sym
Model	RV 250i
Category	Scooter
Language	English