has cut
off power
during
bumpy
road
bumpy leads to
the protection of
controller
turn off key and turn on
key
turn off key and turn on
key
bumpy makes plug
loose
insert and pull plug and
check whether terminal is
functional
replace plug or terminal
inside plug
USB
doesn’t
working
USB plug is loose
check USB plug
insert and pull USB plug
USB converter is
damaged
check whether the voltage
of input plug of USB is
normal with multimeter
replace USB converter
speed is
not
displayed
correctly
wrong setting of
km/mile
reset status of km/mile
reset state of km/mile
modification of
gear ratio or
transmission ratio
leads to changes
speed ratio
check gear ratio and
transmission ratio
restore original gear ratio
and transmission ratio
the speed
on
instrumen
t display
doesn’t
change
plug of instrument
has bad
connection
insert and pull plug and
check whether terminal is
functional
replace plug or terminal
inside plug
speed signal of
controller doesn’t
have output
check speed signal of
controller output voltage
with multimeter
replace controller
instrument is
damaged
check whether the input
signal of instrument is
functional with multimeter
replace instrument
Display
instrumen
t not
working
after turn
on the
power
key
plug of display
instrument has
bad connection
insert and pull plug of
instrument and check
whether terminal is
functional
replace plug or terminal
inside plug
Display instrument
is damaged
check whether the input
line of instrument is
functional with multimeter
replace instrument
lights not
working
after turn
on the
power
key
plug of line of
lights has bad
connection
insert and pull plug and
check terminal is
functional
replace plug or terminal
inside plug
lights is damaged
check whether the input
voltage of light is 12V with
multimeter
replace light
horn not
plug of horn is
loose
insert and pull plug and
check whether terminal is
functional
replace plug of input line
of horn
