PREMIUM E-MOBILITY
YD-EM279
14
3
Electric system
General troubleshooting of vehicle
No.
Fault
phenomenon
Phenomenon
confirmation
Cause analysis Troubleshooting
1
Unable to
charge
1. Unable to charge
after riding
2. Unable to ride dai-
ly
1. Charger fault
1.
Trun on power lock and check the
charging port for voltage. If there is
no voltage, the battery is faulty
2. Internal fault of battery
2. Internal unrecoverable fault shall
be repaired by the factory
3. Lack of electricity in bat-
tery
3. Test whether the battery output
voltage is within the rechargeable
range
4. Low temperature protec-
tion of the battery in low
ambient temperature
4. Place the battery at room tem-
perature and wait
2
No electricity of
the whole vehi-
cle
No discharging of the
battery
1. Controller MOS pipe short
circuit
1. Overhaul or replace the controller
2. Abnormal battery protec-
tion
2. Overhaul or replace the battery
3.
A problem with the main
cable
3. Overhaul the main cable
3
Frequent power
failure during
riding
Return to normal
after replugging
1. The battery temperature
rises too high
1. Check the controller or motor for
leakage or damage
2. Replace battery
2. A large peak current
is detected in the bat-
tery
4
Poor battery
contact
The power is on and
off alternatively after
the discharge plug
is plugged and un-
plugged
1. High current short circuit
in the vehicle
1. Check the short circuit source of
the whole vehicle circuit
2. Replace battery
3. Overhaul the discharging port
2. Poor contact of discharg-
ing port
3. The cycle life of the bat-
tery decays
4. The discharge current of
the battery is too high
5
When the pow-
er is switched
on, the motor
hub does not
work
Trun on power lock
and rotate the han-
dle. The motor has
no response
1. The battery wire is loose
without power
1. Repair and reconnect
2. Ask a dealer for repair
2. Left and right brake
handles out of order after
power cut
3. The motor hub wiring
plug is loose or damaged
6
Speed regula-
tion failure
1. The spring in the speed
regulating handle is stuck
Ask a dealer for repair or replace-
ment
2. Internal Hall element fail-
ure
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