Sym Citycom 300i - Integrated Fault Diagnosis Program

4. Fuel Injection System
4-37
Integrated Failure Diagnosis Program
Checking,
adjusting
Project
Š Use meter direct
measurement
battery voltage
Š Use diagnosis
tool detection
battery voltage
Fault reasonsFault status
determination
Parts specifications
Battery
voltage
Detection of
maintenance projects
and steps
Š Battery electricity
Š Battery connector
loose
Š Harness circuit
opening
Š ECU coupler not
connected properly
Š Battery voltage
is 10 V above?
Š Diagnosis tool
show whether
the voltage of 10
V above?
Š Diagnosis tool
display voltage
required to
achieve more
than 10 V
NO
YES
Š Diagnostic tool
show whether or
not a fault code?
Š Fault Code
cleared after
show again?
Š TPS fault
Š ETS fault
Š CPS fault
Š MAP fault
Š O
2
sensor fault
Š ROS fault
Š ECU fault
Š The sensor
detection
methods and
specifications,
please refer to
repair manual
YES
Š Use of the
diagnosis tool
detection fault
code
Š Elimination of
fault codes, and
then start engine
Diagnosis
fault code
inspection
NO
Š Injector whether
injection?
Š Injector spray
angle is normal?
Š Fuel pressure
enough?
Š 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)
Š Start the engine
Š Examine whether
injector fuel
injection
Š Between the tank
and injector
installation the
pressure gauge
Š check fuel
pressure
adequacy
Fuel
quantity and
fuel
pressure
Š less than fuel tank
Š Injector fault
Š Fuel pump relay
fault
Š Fuel pump fault
Š ECU fault
Š Fuel pump filter
obstructive
Š Pressure fuel
specifications:
Open the main
switch three
seconds after
but not start
engine ‰more
than 250 kPa
Idle →
294„6kPa
Š Injector
resistance
specifications:
11.7„0.6Ω
NO
YES
Š Removed the
spark plug from
the cylinder
head, but then
power lines still
ring
Š Start the engine
Š check spark plug
sparks
Ignition
situation
Š Examine
whether the
spark plug
ignition?
Š Check spark
plug sparks
strength is
normal?
Š Spark plug fault
Š Roll over sensor
fault
Š ECU fault
Š Ignition coil fault
Š Crankshaft position
sensor fault
Š Spark plug
specifications:
NGK-CR8E
Continued next page
YES
NO
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