Yamaha PW SYSTEM Manual page 80

Symptom
The Drive Unit turns on and off while
riding.
Strange rumbling or crunching noises
come from the Drive Unit.
Smoke or unusual odor comes from the
Drive Unit.
Check
Check to make sure the
Battery Pack is locked in
place.
If this problem still occurs
Is the Battery
with the Battery Pack firmly
Pack correctly
locked in place, there may
installed?
be a loose connection with
the Battery Pack terminals
or wires. Have a bicycle
dealer inspect your bicycle.
There could be a problem
inside the Drive Unit.
Have a bicycle dealer
inspect your bicycle.
There could be a problem
inside the Drive Unit.
Have a bicycle dealer
inspect your bicycle.
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