Switching To Ev Drive Mode When The Gasoline Engine Is Cold; Automatic Cancelation Of Ev Drive Mode; Possible Driving Distance When Driving In Ev Drive Mode; Fuel Economy And The Hybrid System - Lexus rx450h Service Manual

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4-2. Driving procedures

Switching to EV drive mode when the gasoline engine is cold

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If the hybrid system is started while the gasoline engine is cold, the gasoline engine will
start automatically after a short period of time in order to warm up. In this case, you will
become unable to switch to EV drive mode.
After the hybrid system has started and the "READY" indicator has illuminated, press the
EV drive mode switch before the gasoline engine starts to switch to EV drive mode.

Automatic cancelation of EV drive mode

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When driving in EV drive mode, the gasoline engine may automatically restart in the fol-
lowing situations. When EV drive mode is canceled, a buzzer will sound, the EV drive
mode indicator will go off after flashing, and a message is displayed on the multi-informa-
tion display.
The hybrid battery (traction battery) becomes low.
●
The remaining battery level indicated in the "Energy Monitor" display is low. (P. 125)
Vehicle speed is high.
●
The accelerator pedal is depressed firmly or the vehicle is on a hill, etc.
●

Possible driving distance when driving in EV drive mode

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EV drive mode' s possible driving distance ranges from a few hundred meters to approxi-
mately 0.6 mile (1 km). However, depending on vehicle conditions, there are situations
when EV drive mode cannot be used. (The distance that is possible depends on the
hybrid battery [traction battery] level and driving conditions.)
Fuel economy
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The hybrid system is designed to achieve the best possible fuel economy during normal
driving (using the gasoline engine and electric motor [traction motor]). Driving in EV
drive mode more than necessary may lower fuel economy.
WARNING
Caution while driving
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When driving in EV drive mode no engine noise is made. As such, pedestrians, people
riding bicycles or other people and vehicles in the surrounding area may not be aware
of the vehicle starting off or approaching them. Therefore, take extra care while driving
even if the vehicle proximity notification system is active.
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