2018 TOYOTA PRIUS PLUG-IN HYBRID Owners Manual

972-1. Plug-in hybrid system
2
Plug-in hybrid system
PRIUS PHV_OM_OM47C99E_(EE)
The plug-in hybrid system operates in the following modes.
The multi-information display can be used to check which mode the plug-in
hybrid system is currently being driven in. (P. 223)
EV mode
When a sufficient amount of electricity is remaining after
charging
*1, EV driving is performed using electricity stored in the
hybrid battery (traction battery).
*2
When in EV mode, the EV drive mode indicator illuminates.
*1: The amount of remaining charge can be checked on the multi-informa-
tion display etc. (P. 235)
*2: Depending on the situation, EV driving may be canceled and both gaso-
line engine and electric motor are used. (P. 106)
Plug-in hybrid system operation mode
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982-1. Plug-in hybrid system
PRIUS PHV_OM_OM47C99E_(EE)
EV City mode (P. 100)
When a sufficient amount of electricity for EV driving is remaining in
the hybrid battery (traction battery)
*1, the operation mode can be
switched to EV City mode.
EV City mode limits motor output and minimizes the operation of
the gasoline engine.
*2 Therefore, the vehicle can be driven with
only electric motor (traction motor) in city areas, etc.
When in EV City mode, the EV City mode indicator illuminates.
*1: The amount of remaining charge can be checked on the multi-informa-
tion display etc. (P. 235)
*2: When acceleration is required, fully depress the accelerator pedal to
start the gasoline engine.
HV mode
When in HV mode, the vehicle is driven using both the gasoline
engine and electric motor. (P. 104)
●If electricity needed for EV driving in EV mode is not remaining,
the operation mode will be automatically switched to HV mode.
●The operation mode can be switched to HV mode at any timing
by operating the switch to keep electricity for EV driving etc.
*
(P. 100). Switching to HV mode when driving on a highway or
when driving uphill is recommended in order to conserve battery
power.
When in HV mode, the EV drive mode indicator and EV City mode indi-
cator turn off.
*: The EV driving range may reduce even after switching to HV mode.
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3

992-1. Plug-in hybrid system
2
Plug-in hybrid system
PRIUS PHV_OM_OM47C99E_(EE)
Hybrid battery (traction battery) charge mode (P. 101)
Electricity generated in the gasoline engine can be charged in the
hybrid battery (traction battery) by switching to the hybrid battery
(traction battery) charge mode when electricity needed for EV driv-
ing is not remaining.*
●The system may not be able to switch to the hybrid battery (trac-
tion battery) charge mode due to the state of the plug-in hybrid
system. (P. 102)
●Charging time differs depending on the driving state of the vehi-
cle when driving in hybrid battery (traction battery) charge mode.
When in the hybrid battery (traction battery) charge mode, the hybrid
battery charge mode indicator illuminates.
*: When in the hybrid battery (traction battery) charge mode, the hybrid
battery can be charged while driving. However, the gasoline engine runs
to charge the battery and fuel consumption becomes higher compared
with driving in HV mode.
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1002-1. Plug-in hybrid system
PRIUS PHV_OM_OM47C99E_(EE)
The plug-in hybrid system operation modes can be switched using the
switches.
If there is not enough charge remaining in the hybrid battery (traction bat-
tery) to allow EV driving, EV/EV City mode will not be selectable.
The hybrid battery (traction battery) charge mode cannot be selected if the
hybrid battery (traction battery) is almost completely charged.
■
Switching between EV mode and HV mode
Press the EV/HV mode selection switch.
EV mode and HV mode will be switched between with each press.
When in EV mode, the EV drive mode indicator illuminates.
■
Switching to EV City mode
Press the EV City mode switch.
The EV City mode indicator comes on.
To cancel EV City mode, press the EV City mode switch again.
Switching the plug-in hybrid system operation modes
Left-hand drive vehiclesRight-hand drive vehicles
Left-hand drive vehiclesRight-hand drive vehicles

1012-1. Plug-in hybrid system
2
Plug-in hybrid system
PRIUS PHV_OM_OM47C99E_(EE)■
Switching to the hybrid battery (traction battery) charge mode
Press and hold the EV/HV mode selection switch.
Take your hand off the switch once the hybrid battery charge mode indi-
cator starts to blink.
The hybrid battery charge mode indicator illuminates when the switch to
hybrid battery (traction battery) charge mode is complete.
When the hybrid battery (traction battery) is fully charged
*, the hybrid
battery (traction battery) charge mode is automatically canceled and the
operation mode will be switched to HV mode.
The hybrid battery (traction battery) charge mode will be canceled by
pressing EV/HV mode selection switch or EV City mode switch.
*: The maximum charge amount in the hybrid battery (traction battery)
charge mode is approximately 80% of the fully charged capacity for the
charging from an external power source.
Left-hand drive vehiclesRight-hand drive vehicles

1022-1. Plug-in hybrid system
PRIUS PHV_OM_OM47C99E_(EE)
■If the plug-in hybrid system operation mode cannot be changed
In the following situations, the plug-in hybrid system operation mode cannot
be changed even if the EV/HV mode selection switch or EV City mode switch
is pressed. (In this case, the warning message is displayed on the multi-infor-
mation display when the switch is pressed.)
●When electricity needed for EV driving is not remaining (when in EV/EV City
mode)
●When the traction battery is almost completely charged (hybrid battery [trac-
tion battery] charge mode)
■When EV City mode is canceled
When EV City mode is canceled, either automatically or by pressing the EV
City mode switch, while the accelerator pedal is depressed, the drive torque
and vehicle speed may increase even if the accelerator pedal is maintained
at a fixed position. When EV City mode is canceled, a buzzer will sound and
the EV City mode indicator will flash and go off.
■When switching from EV mode to another mode using the switch
When the power switch is turned off, operation mode switching is canceled
and the system returns to EV mode the next time the vehicle is started.
■Hybrid battery (traction battery) charge mode
●The following may occur to protect the system, etc.
• Cannot switch to hybrid battery (traction battery) charge mode or cannot
cancel it
• Gasoline engine does not start or stops even after switching to hybrid bat-
tery (traction battery) charge mode
●If a load to the system is large, such as when the power consumption of the
air conditioning system is large or when the temperature of the engine cool-
ant is high, it may take longer time than usual to charge using the hybrid bat-
tery (traction battery) charge mode, or charging to the hybrid battery
(traction battery) may not be performed.

1032-1. Plug-in hybrid system
2
Plug-in hybrid system
PRIUS PHV_OM_OM47C99E_(EE)■
When in EV mode
In EV mode, EV driving (driving using only the electric motor)
* is
possible. However, depending on the situation, EV driving may be
canceled and both gasoline engine and electric motor are used
(P. 106). Also, if a little electricity is remaining in the hybrid battery
(traction battery), HV mode is automatically selected. To drive in EV
mode long, observe the followings.
●Avoid sudden acceleration and sudden deceleration, and be sure
to drive smoothly.
If you repeatedly accelerate, the hybrid battery (traction battery)
charge will deplete quickly. Also, EV driving may be canceled by
rapid acceleration or vehicle speed.
●Restrain your speed as much as possible. The distance that can
be driven in EV mode will reduce considerably at high speeds.
*: The EV driving range can be checked using the multi-information dis-
play etc. (P. 218, 234, 241, 258)
■
When in EV City mode
In EV City mode, EV driving (driving using only the electric motor) is
possible.
*1
●Motor output is limited at the same level unless the accelerator
pedal is fully depressed.
When it is necessary to accelerate the vehicle, depress the
accelerator pedal completely or cancel EV City mode as needed.
●In the following situations, EV City mode is automatically can-
celed.
*2
• When driving in EV driving is not possible. (P. 106)
• When Dynamic radar cruise control with full-speed range is
activated.
• When the accelerator pedal is fully depressed.
*1: The EV driving range can be checked using the multi-information dis-
play etc. (P. 218, 234, 241, 258)
*2: Depending on the circumstances, EV City mode may also be canceled
in situations other than those above.
Control when driving in each mode

1042-1. Plug-in hybrid system
PRIUS PHV_OM_OM47C99E_(EE)■
When in HV mode
The vehicle can be used in the same way as a standard hybrid
vehicle.
In HV mode, controls are primarily carried out as follows in accor-
dance with the driving conditions.
●The gasoline engine stops
* when the vehicle is stopped.
●During start off, the electric motor (traction motor) drives the vehi-
cle.
●During normal driving, the gasoline engine and electric motor
(traction motor) are controlled effectively, and the vehicle is
driven with optimum fuel efficiency. Also, when necessary, the
electric motor (traction motor) operates as an electrical generator
to charge the hybrid battery (traction battery).
●When the accelerator pedal is depressed heavily, drive force
from both the gasoline engine and the electric motor (traction
motor) is used to accelerate.
*: When the hybrid battery (traction battery) requires charging or the
engine is warming up, etc., the gasoline engine will not automatically
stop. (P. 106)
■
When braking (regenerative braking)
The electric motor (traction motor) charges the hybrid battery (trac-
tion battery).
The EV driving range can be extended by actively using this regen-
erative braking to store electricity in the hybrid battery (traction bat-
tery).
Moreover, as fuel consumption is also reduced when in HV mode,
the regenerative braking system can be used effectively.