Troubleshooting - Yamaha X94 Series Service Manual

Troubleshooting

Symptom
The pedal feels heavy.
The e-bike systems activates
and cuts off during driving.
The cruising distance is
short.
The 3 assist mode lamps, the
"%" lamp, the "Km" lamp, and
the "km/h" lamp are flashing
at the same time, and "Er" is
displaying on the LED type
display unit.
All segments of the assist
mode display and battery
capacity indicator are flash-
ing at the same time, and "Er"
is displaying on the speed-
ometer section of the LCD
type display unit.
Check point/method
Is the air pressure in the tires
normal?
Is the gear-shifting working
smoothly?
Is it being driven up a long
slope in the summer, or car-
rying a heavy load?
Is the ambient temperature
low (around 10°C or below)?
Is the battery pack securely
locked?
Has the battery pack been
sufficiently charged?
Is it being used in a low-tem-
perature environment?
Is the battery pack degrad-
ing?
Check the error according to
the display on the display unit
when the error occurred.
(See Chapter 2 "How com-
munication errors are dis-
played".)
Troubleshooting
Possible cause/check Part replacement/action
Check for appropriate air
pressure.
Check for punctures.
Check the gear shifting sys-
tem.
This is due to the tempera-
ture rising in the battery pack
or the Drive Unit assembly,
and is not a malfunction.
Check the ambient tempera-
ture.
Check the battery pack lock.
Check the ambient tempera-
ture.
Check the battery pack's
Total number of battery
charging cycles , actual
capacity.
Communication error.
Check the "List of error codes
and corresponding power
assist operations".
4-3
Service
Data
Repair puncture, replace
tube.
Replace the gear shifting sys-
tem.
The assist power is restored
once the temperature of the
battery pack or the Drive Unit
assembly drops.
During the winter, store the
battery pack indoors before
use.
Check if the battery pack is
securely locked.
Inspect the battery pack ter-
minals and wiring for loose
connection.
Charge until full.
This will be restored when
the ambient temperature
warms up.
Replace the battery pack.
Replace parts according to
"List of error codes and corre-
sponding power assist opera-
tions".