Sym Joyride 125 Service Manual page 111

5. Fuel Injection System
Parts No.
Item Parts Service schedule
Name
366-008 At least 20000km
5
Intake life-expectancy
temperatur Check every
e/pressure 3000km
sensor
6 308-008 At least 20000km
Throttle life-expectancy
body Check every
3000km
7 337-004 At least 20000km
Fuel life-expectancy
injector Check every
3000km
5-54
To this chapter contents
Inspection Method
Connect the diagnostic tool for
inspection. The engine intake
temperature and pressure should
approximate environmental
temperature and atmosphere
pressure. (Execute this task after
engine is stopped for a while)
If the DTC codes of intake
temperature or pressure shown on
the diagnostic tool, replace the
pressure sensor with new one.
Check if the DTC codes are
disappearing. If not, check the
connector wires for short-circuit.
Replace the connector if necessary.
If the DTC codes still exist, replace
the ECU. But if the DTC codes
disappear, install the original
pressure sensor and check it again.
If the original sensor doesn't trigger
the DTC error code, replace the ECU
with new one.
Please refer to idle speed adjustment
section for the idle speed CO
adjustment.
Connect the diagnostic tool and
check if the throttle position DTC
code appears.
If the code appears, replace the
throttle body to make sure the code
can be erased.
If the code disappears, replace the
throttle body.
If the code still exists, replace the
ECU with new one.
Check if the fuel injector DTC code
appears.
If the code appears, replace a new
fuel injector for confirmation. If the
code can be erased, then, replace
the fuel injector.
If the code still is there after
changing a new injector, check if
connector wire is short.
If the code still exists, replace the
ECU with new one. If the code can
be erased after changing the ECU,
this ECU has to be replaced.
Adjustment & replacement procedure
Replacement procedure for T-MAP
(intake temperature/pressure sensor)
Turn off the ignition switch.
Disconnect the connector of intake
temperature/pressure sensor. Replace
the sensor with new one.
Connect the connector with diagnostic
tool.
Turn on the ignition switch, and check
if the intake temperature/ pressure
readings close to environmental
temperature and atmosphere
pressure.
Erase the DTC codes, and make sure
the problem is solved.
The throttle body replacement
procedure:
Install a new throttle body
Make sure there is no leaking.
Connect the diagnostic tool and read
the carbon-accumulated time.
Reset the time with the diagnostic tool.
Reset the throttle position data with
the diagnostic tool.
Throttle valve WOT set up. Turn off
ignition switch, and WOT the throttle
valve and hold. Turn on the ignition
switch and hold WOT position for 2
seconds. Then release the throttle
valve.
Please refer to the idle speed
adjustment section for the idle speed
CO if necessary.
Confirmation or replacement
procedure for the fuel injector:
Erase the DTC code with the Data
Scan.
Turn off ignition switch and disconnect
the fuel injector coupler.
Connect to a new fuel injector.
Connect the diagnostic tool, and turn
on the ignition switch.
Make sure the DTC code had been
cleared.
Please refer to idle speed adjustment
section for idle speed CO value
confirmation.
(Firstly, make sure if the fuel injector
DTC code had been clear, and then
install a new fuel injector.)