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189
5-2. Driving procedures
5
Driving
MIRAI_OM_USA_OM62054U(18MY)_O
M62048U(19MY)
■ Starting the fuel cell system in cold temperatures
● When the power switch is pressed and the fuel cell system starts (P. 186)
during cold temperatures, the fuel cell stack is quickly warmed up using the
waste heat during power generation.
● When the temperatures is cold, it may take some time until the “READY”
indicator turns on.
● When starting the fuel cell system during cold weather, “FC System Shut-
down due to Freezing conditions Stop Your Vehicle in a Safe Place and
Contact Your Dealer” may be displayed in the multi-information display.
The fuel cell system is frozen and can not be started. Contact a Toyota
dealer.
● The power output will be temporarily limited until the fuel cell system
reaches full operating temperature.
● The fuel cell system noises may become louder when the temperature is
cold. This is the normal warm-up operation and is not a malfunction. In
some cases, operation noises may continue for a some time even after the
“READY” indicator has turned on. (P. 88)
■ Stopping the fuel cell system in cold temperatures
● When the power switch is pressed and the fuel cell system is stopped
(P. 187) during cold temperatures, the time for water purge from the tail-
pipe may be longer than usual to prevent liquid in the fuel cell stack from
freezing.
● The water purge time may also be long if the system is stopped before fuel
cell system warm-up is completed.
● It is normal to hear hissing and other sounds during purge. (P. 8 8)
● The H
2
O indicator on the meter will illuminate during purge.
● In extremely cold temperatures, the
“READY” indicator may take more than
10 seconds to illuminate. In this case,
the status progression of the fuel cell
system startup is displayed on the multi-
information display.
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