Procedure - Sym Joyride 125 Service Manual

Engine cannot be started or difficult to start.
Does the warning lamp goes
on for 2 seconds and then off?
Is the warning lamp out of
order?
Is the electrical circuit abnormal?
Is the fuel system abnormal?
Is the engine abnormal?
To this chapter contents
Cannot be started or difficult to start
OK
OK
OK
OK
OK
END
5
. Fuel Injection System
1.
Check electrical circuit according to
NG

procedure.

1. Connect the diagnostic tool and check
NG
trouble content.
2. Trouble shooting according to the
troubleshooting procedure.
1. No spark on the spark plug?
2. Wet spark plug?
3. Loosen spark plug cap?
NG
4. Short in RPM sensor?
5. Loosen high voltage cable?
6. No connection for the by-pass valve?
7. Abnormal ECU?
8. Clean the throttle valve body and ECU
does not be set-up?
1. Low fuel in fuel tank.
2. The fuel pressure of the injector is lower
than 2.5bar.
NG
3. Fuel leaking in pipe?
4. Abnormal regulator?
5. Fuel pump pipe leaking?
6. Abnormal fuel pump?
7. Abnormal fuel injector?
1. No valve clearance?
2. Incorrect ignition timing?
3. Stuck valve?
NG
4. Worn out cylinder and piston ring?
5. Improperly adjustment of the air
adjustment screw onto the throttle valve
body?
5-11