21
Troubleshooting
Detection Item
Possible Causes
Countermeasures
1
Unable to charge
Not using SYM
authorized battery
Using SYM authorized battery
Low input voltage
Power input 100V~240V
2
Long time charging
without green light on
Battery deterioration or
malfunction
Replace battery
3
Meter doesn’t work and
indicator
doesn’t
illuminate.
Power cable of battery is
not connected.
Reconnect the power cable and then switch
on.
Battery inner cable loose
Reconnect the inner cable and then switch
on.
Main
switch
coupler
loose
If the coupler is loose, reconnect it. If the
coupler is ok, there might be open circuit in
the wire harness. Please contact your SYM
dealer.
Main switch malfunction
Replace the main switch
Low battery voltage
1 Recharge the battery. Check if the battery
voltage is 60V.
2. Replace the battery when the voltage is
under 30V after recharging.
4
Malfunction
of
light
system
DC / DC
Converter malfunction
1. Check the appearance and harness for
abnormality
2. Check whether the positive and negative
poles of DC are short circuited (including
input and output)
3. When the whole vehicle is powered on,
check whether the measured voltage is
abnormal (i.e. measured with a multimeter,
the output voltage shall be 13.5V ± 0.5V)
4.Contact your SYM dealer.
5
Rear wheel does not
rotate when the electric
throttle is rotated.
Faulty main switch
Replace the main switch
Motor wire loose
Reinstall
Ineffective
motor
position feedback signal
Contact your SYM dealer
Motor malfunction
Motor
controller
overheated
Motor
controller
malfunction
6
Riding mileage is too
short.
Front / rear brake too
tight
Adjust front / rear brake.
Long
time
without
charging
Recharge after riding or when the vehicle is
not in use for a long time.
Low temperature
Battery quantity will decrease when the
temperature is low.
Low tire pressure
Check the tire pressure periodically (every
month) and inflate the tire to the
recommended pressure.
Aged battery
Replace the battery
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