Yamaha PASC4 Owner's Manual page 40

Walk assist
When you are on or off the bicycle and start moving it, you
can use walk assist without pedaling the bicycle.
To use walk assist, press and hold the walk assist switch.
Walk assist will not work in the following situations:
When you release the walk assist switch.
If you press another switch at the same time.
When you start to pedal.
If your bicycle speed exceeds 3.6 mph (6 km/h).
If you select Off Mode.
If the wheels are not turning (when braking or coming
into contact with an obstacle, etc.).
Self-diagnosis function
The e-Bike Systems are equipped with a self-diagnosis
function. If a malfunction or fault occurs in the e-Bike Sys-
and an error message will be shown on the function dis-
remedies for abnormal displays and abnormal flashing.
WARNING
If the problem cannot be solved, have your bicycle in-
spected by a dealer as soon as possible.
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