Generic Onyx 50 - Page 31

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Riding-style motorcycle
Motorcycle scooter
Y N
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Diagnosis on starter motor failure in rotation
The electric horn does not make
sound or makes weak sound; the
steering lamp emits weak light.
The electric horn makes loud sound
and the steering lamp emits bright
light.
Battery power shortage or bad
contact of conductor joint
Grip the brake lever (motor scooter), or make the
transmission at neutral gear, or grip the clutch
lever; press the startup button.
Starter motor failure in
rotation
Turn the ignition switch; press the horn; press or turn
the steering lamp switch.
Press the startup button and there is no joint sound
from starting relay.
Press the startup button and there is joint sound
from starting relay.
Disassemble the connector of starting relay from
the cable assembly; use two lead wires to connect
the battery with two down-leads of the starting
relay coil.
Use screwdriver or large-diameter
lead wire to short-circuit the battery
terminal on the starting relay and
the starter motor terminal.
The starting relay works
normally after connection.
The starter motor
works normally after
short circuit.
The starter motor does not
work after connection,
and there is no sound
from starting relay.
The starter motor
does not work
after short circuit.
O
p
en circuit or
short circuit of
starting relay coil.
Check the inner circuit of the
electric starting control system
Contacts of starting
relay are burnt or
damaged.
Disassemble the starter motor
and check:
1. whether the carbon brush is
excessively abraded;
2. whether the carbon brush
spring is ruptured or lacks
elasticity;
3. whether the armature
commutator is excessively
abraded;
4. whether open circuit or short
circuit occurs to the armature
coil.
1. Check whether the
contact of starting
b
utton is in good
condition.
2. Check whether the
commutation diode is
damaged.
3. Check whether the
neutral gear switch
works normally.
4. Check whether open
circuit or short circuit
occurs to the inner lines
of electric starting
control s
y
stem.
Check whether the
contact of starting button
is bad.
Grip the brake lever and check whether the
brake lamp is light.
Bad contact inside the brake
lamp switch or open circuit of
its auxiliary lines.
Repair or
replace starting
button
Open circuit or short circuit
inside the electric starting
control system