Get Plug-inhybridsystem -> 2-1. Plug-in hybrid system Guide for Toyota Prius 4 Door Fifth Generation (2023-2026)

72

2-1. Plug-in hybrid system

2-1.Plug-in hybrid system

Plug-in hybrid system features

The plug-in hybrid system is a system excellent in both eco-

nomical efficiency of electric vehicles and practicality of Plug-

in Hybrid Electric Vehicles

 EV driving can be performed using electricity charged from an

external power source.^*

 If the amount of electricity remaining in the hybrid battery (trac-

tion battery) becomes low, the vehicle is automatically controlled

in such a way that it can be driven as a Plug-in Hybrid Electric

Vehicle through the joint use of the gasoline engine.

*

: The EV driving range will vary in accordance with conditions such as

vehicle speed, the amount of charge remaining in the hybrid battery

(traction battery) and the usage of the air conditioning system. The gas-

oline engine may also be used simultaneously in accordance with driv-

ing conditions.

System components

The illustration is an example for explanation and may differ from the actual

item.

A

Gasoline engine

B

Electric motor (traction motor)

73

2-1. Plug-in hybrid system

■ AUTO EV/HV mode

Plug-in hybrid system

operation mode

The plug-in hybrid system oper-

ates in the following modes.

The meter display can be used to

check which mode the plug-in

hybrid system is currently being

driven in. (P.150)

■ EV mode

2

Normally, the electricity stored

in the hybrid battery (traction

battery) is used for EV driving.

However, when more power is

required, such as for driving

uphill or accelerating suddenly,

the gasoline engine starts and

provides powerful acceleration

by strongly depressing the

accelerator pedal.

When a sufficient amount of

electricity is remaining after

charging^*1, EV driving is per-

formed using electricity stored in

the hybrid battery (traction bat-

When the vehicle is in a condi-

tion where EV driving is possi-

ble, EV mode and AUTO EV/HV

mode can be switched by oper-

ating the switch. (P.74)

tery).^*2

When in AUTO EV/HV mode, the

AUTO EV/HV mode indicator illumi-

nates.

When in EV mode, the EV drive

mode indicator illuminates.

*1

:The amount of remaining charge

■ HV mode

can be checked on the SOC

(State of Charge) gauge.

(P.155)

*2

:Depending on the situation, EV

driving may be canceled and

both gasoline engine and electric

motor are used. (P.79)

When in HV mode, the vehicle is

driven using both the gasoline

74

2-1. Plug-in hybrid system

remaining.^*

engine and electric motor.

(P.77)

• The system may not be able

to switch to the hybrid battery

(traction battery) charge

mode due to the state of the

plug-in hybrid system.

(P.76)

• Charging time differs depend-

ing on the driving state of the

vehicle when driving in hybrid

battery (traction battery)

charge mode.

• If electricity needed for EV

driving in EV mode or AUTO

EV/HV 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 driv-

ing etc. (P.74).^*Switching

to HV mode when driving on a

highway or when driving uphill

is recommended in order to

conserve battery power.

When in the hybrid battery (traction

battery) charge mode, the hybrid

battery charge mode indicator illu-

minates.

*

: When in the hybrid battery (trac-

tion battery) charge mode, the

hybrid battery can be charged

while driving. However, the gaso-

line engine runs to charge the

battery and fuel consumption

becomes higher compared with

driving in HV mode.

When in HV mode, the HV drive

mode indicator illuminates.

*

: The EV driving range may reduce

even after switching to HV mode.

■ Hybrid battery (traction bat-

tery) charge mode (P.75)

Plug-in hybrid system

operation mode selection

switches

The plug-in hybrid system oper-

ation modes can be switched

using the switches.

■ Switching the plug-in

hybrid system operation

modes

Electricity generated by the gas-

oline engine can be used to

charge the hybrid battery (trac-

tion battery) by switching to the

hybrid battery (traction battery)

charge mode when electricity

needed for EV driving is not

Press the AUTO EV/HV mode

switch or EV/HV mode selection

switch to change modes as the

following table shows.

When in EV mode, the EV drive

75

2-1. Plug-in hybrid system

mode indicator illuminates.

Mode after

switching

Current mode

EV mode

When in AUTO EV/HV mode, the

AUTO EV/HV mode indicator illumi-

nates.

HV mode

AUTO EV/HV

mode

When in HV mode, the HV drive

mode indicator illuminates.

HV mode

*

HV mode

 AUTO EV/HV mode switch

EV mode

*

: If there is not enough charge

remaining in the hybrid battery

2

(traction battery) to allow EV driv-

ing, EV mode will not be select-

able.

■ Switching to the hybrid bat-

tery (traction battery)

charge mode

Press and hold the EV/HV mode

selection switch.

Mode after

Current mode

switching

Take your hand off the switch once

the hybrid battery charge mode

indicator starts to blink.

AUTO EV/HV

EV mode

mode

AUTO EV/HV

EV mode

mode

The hybrid battery charge mode

indicator illuminates when the

switch to hybrid battery (traction

battery) charge mode is complete.

AUTO EV/HV

*

HV mode

mode

When the hybrid battery (traction

*

: If there is not enough charge

battery) is sufficient charged , the

remaining in the hybrid battery

(traction battery) to allow EV driv-

ing, AUTO EV/HV mode will not

be selectable.

hybrid battery (traction battery)

charge mode is automatically can-

celed and the operation mode will

be switched to HV mode.

 EV/HV mode selection switch

The hybrid battery (traction bat-

tery) charge mode will be canceled

by pressing AUTO EV/HV mode

switch or EV/HV mode selection

switch.

*

: The maximum charge amount in

the hybrid battery (traction bat-

tery) charge mode is approxi-

mately 80% of the sufficient

charged capacity for the charging

76

2-1. Plug-in hybrid system

from an external power source.

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 battery (traction battery)

charge mode

●If a load to the system is large,

such as when the power con-

sumption of the air conditioning

system is large or when the tem-

perature of the engine coolant is

high, it may take longer time than

usual to charge using the hybrid

battery (traction battery) charge

mode, or charging to the hybrid

battery (traction battery) may not

be performed.

■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

AUTO EV/HV mode switch or

EV/HV mode selection switch is

pressed. (In this case, the warning

message is displayed on the multi-

information display when the switch

is pressed.)

WARNING

■When using the hybrid bat-

tery (traction battery) charge

mode

Observe the following precautions

when using the hybrid battery

(traction battery) charge mode

while parking.

●When electricity needed for EV

driving is not remaining (when in

EV mode or AUTO EV/HV mode)

●When the hybrid battery (traction

battery) is almost completely

charged (hybrid battery [traction

battery] charge mode)

Failure to do so may lead to death

or serious health hazard, as the

gasoline engine operates when in

the hybrid battery (traction bat-

tery) charge mode.

■When switching from EV mode

to another mode using the

switch

●Do not stop the vehicle near

flammable materials.

When the power switch is turned off,

operation mode switching is can-

celed and the system returns to EV

mode the next time the vehicle is

●Do not use the hybrid battery

(traction battery) charge mode

in a closed area where ventila-

tion is insufficient, such as in a

garage or area with snow

buildup.

*

started.

*

: If there is not enough charge

remaining in the hybrid battery

(traction battery) to allow EV driv-

ing, the system switches to HV

mode.

Control when driving in

each mode

■Hybrid battery (traction battery)

■ When in EV mode

charge mode

In EV mode, EV driving (driving

●The following may occur to protect

77

2-1. Plug-in hybrid system

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.79). Also, if a little

electricity is remaining in the

hybrid battery (traction battery),

HV mode is automatically

automatically the same as in EV

mode.

AUTO EV/HV mode is suitable

for driving conditions when more

power is required, such as for

driving uphill or accelerating

suddenly. However, because

the gasoline engine will start

more easily, it is recommended

to drive in EV mode usually.

selected. To drive in EV mode

long, observe the followings.

2

*

: The EV driving range can be

checked using the meter.

 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 acceler-

ation or vehicle speed.

(P.155)

■ When in HV mode

The vehicle can be used in the

same way as a standard Plug-in

Hybrid Electric Vehicle

In HV mode, controls are pri-

marily carried out as follows in

accordance with the driving con-

ditions.

 Restrain your speed as much

as possible. The distance that

can be driven in EV mode will

reduce considerably at high

speeds.

 The gasoline engine stops^*

when the vehicle is stopped.

 During start off, the electric

motor (traction motor) drives

the vehicle.

*

: The EV driving range can be

checked using the meter.

(P.155)

 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 in AUTO EV/HV mode

Only the electric motor is used

for EV driving^*during normal

driving, but when the accelera-

tor pedal is strongly depressed,

the gasoline engine starts.

(P.79)

Also, when the hybrid battery

(traction battery) level is low, the

mode switches to HV mode

78

2-1. Plug-in hybrid system

when the Regeneration Boost is

operating. (P.260)

■EV driving range

 When the accelerator pedal is

depressed heavily, drive force

from both the gasoline engine

and the electric motor (trac-

tion motor) is used to acceler-

ate.

●The EV driving range is displayed

on the meter. (P.155)

●The EV driving range changes in

accordance with the charge status

of the hybrid battery (traction bat-

tery), the speed of the vehicle, etc.

*

: When the hybrid battery (traction

battery) requires charging or the

engine is warming up, etc., the

gasoline engine will not automati-

cally stop. (P.79)

●Even if there is enough charge

remaining in the hybrid battery

(traction battery), EV driving may

be canceled and both gasoline

engine and electric motor are

used depending on the situation.

(P.79)

■ When braking (regenera-

tive braking)

The electric motor (traction

motor) charges the hybrid bat-

tery (traction battery).

■EV indicator

The EV indicator comes on when

the vehicle is driven using only the

electric motor (traction motor) or the

gasoline engine is stopped.

The EV driving range can be

extended by actively using this

regenerative braking to store

electricity in the hybrid battery

(traction battery).

The on/off operation of the EV indi-

cator can be changed. (P.166)

Moreover, as fuel consumption

is also reduced when in HV

mode, the regenerative braking

system can be used effectively.

■After EV mode has switched to

HV mode due to low hybrid bat-

tery (traction battery) charge

■Regenerative braking

●In the following situations, kinetic

energy is converted to electric

energy and deceleration force can

be obtained in conjunction with

the recharging of the hybrid bat-

tery (traction battery).

• The accelerator pedal is released

while driving with the shift position

in D or B.

If the hybrid battery (traction battery)

is regenerated by driving continu-

ously down a long slope, the EV

driving range etc. will be displayed

on the meter and EV mode will be

automatically switched to.

If EV mode is not switched to even

though EV driving range is being

displayed, EV mode can be

switched to by pressing the EV/HV

mode selection switch.

• The brake pedal is depressed

while driving with the shift position

in D or B.

●The Regeneration Boost oper-

ates when the shift position is

shifted to B. The regenerative

braking force can be changed

79

2-1. Plug-in hybrid system

■Gasoline engine operation in

EV mode or AUTO EV/HV mode

■If “Engine Started to Clean Sys-

tem EV driving unavailable” is

displayed on the multi-informa-

tion display

Even if there is a sufficient amount

of electricity remaining in the hybrid

battery (traction battery) and EV

driving range (P.155) is being dis-

played on the meter, EV driving

(driving using only the electric

motor) may be canceled and both

gasoline engine and electric motor

are used depending on the situation

(EV driving will be returned to auto-

matically after EV driving becomes

possible again).

EV driving may be canceled in order

to protect the hybrid system, etc.

In this case, perform driving with the

gasoline engine until EV driving will

be returned to automatically.

Depending on the conditions, driv-

ing that combines the use of the

gasoline engine may continue for a

short while. However, this is not a

malfunction.

2

EV driving may be canceled auto-

matically in the following circum-

*1

■Conditions in which the gaso-

line engine may not stop

stances :

The gasoline engine starts and

stops automatically. However, it

may not stop automatically in the

●When vehicle speed is more than

approximately 84 mph (135 km/h).

*

following conditions :

●When power is needed temporar-

ily, for example when the acceler-

ator pedal is depressed firmly or

●During gasoline engine warm-up

●During hybrid battery (traction bat-

tery) charging

*2

when accelerating suddenly.

●When the temperature of the

hybrid system is high.

The vehicle has been left in the

sun, driven on a hill, driven at high

speeds, etc.

●When the temperature of the

hybrid battery (traction battery) is

high or low

●When the windshield defogger

switch is pressed. (P.434)

●When the temperature of the

hybrid system is low.

*

: Depending on the circumstances,

the gasoline engine may also not

stop automatically in situations

other than those above.

●When the heater is switched on

when the outside temperature is

below about 14°F (-10°C).

●When the windshield defogger

switch is pressed. (P.434)

●When the system determines that

the gasoline engine needs to be

started.

■Sounds and vibrations specific

to a Plug-in Hybrid Electric

Vehicle

Because there is no engine sound

or vibration, it is easy to mistake the

Plug-in Hybrid Electric Vehicle for

being off when it is actually still run-

ning, as indicated by the “READY”

indicator being illuminated. For

safety, make sure to always shift the

shift position to P and apply the

parking brake when parked.

*1

:The gasoline engine may also

operate in circumstances other

than those listed above, depend-

ing on conditions.

*2

:When driving in AUTO EV/HV

mode. Even in EV mode, the gas-

oline engine may start, depend-

ing on the condition of the hybrid

battery (traction battery).

The following sounds or vibrations

may occur when the hybrid system

is operating and are not a malfunc-

tion.

80

2-1. Plug-in hybrid system

●Motor sounds may be heard from

the engine compartment.

Even if charging the hybrid battery

(traction battery) has not been com-

pleted, the vehicle can be driven.

However, if there is not enough

charge remaining, it is possible that

the vehicle cannot be driven in EV

mode or AUTO EV/HV mode or the

EV driving range will become

shorter.

●Sounds may be heard from the

hybrid battery (traction battery)

when the hybrid system starts or

stops.

●Relay operating sounds such as a

snap or soft clank will be emitted

from the hybrid battery (traction

battery), under the rear seats or

under the floor, when the hybrid

system is started or stopped.

●Sounds from the hybrid system

may be heard when the back door

is open.

●Sounds may be heard from the

transmission when the gasoline

engine starts or stops, when driv-

ing at low speeds, or during idling.

●Engine sounds may be heard

when accelerating sharply.

●Sounds may be heard due to

regenerative braking when the

brake pedal is depressed or as

the accelerator pedal is released.

●Vibration may be felt when the

gasoline engine starts or stops.

■Refilling fuel

●Sounds may be heard from near

the hybrid battery (traction battery)

in accordance with the operation

of the air conditioning system or

battery cooler. (P.109)

Plug-in Hybrid Electric Vehicles can

be driven using electricity charged

from an external power source.

However, as the gasoline engine is

used depending on the situation

(P.79) even if in EV mode or

AUTO EV/HV mode, and the gaso-

line engine is provided on board as

a power source for driving in HV

mode, it is needed to refueling the

vehicle.

■Maintenance, repair, recycling,

and disposal

Contact your Toyota dealer regard-

ing maintenance, repair, recycling

and disposal. Do not dispose of the

vehicle yourself.

Check the fuel amount and refill

immediately when the fuel level

becomes low. (P.279)

Charging (P.94)

■If the vehicle is not used for a

long time

In order to make EV mode or

AUTO EV/HV mode available,

charge the hybrid battery (trac-

tion battery) from an external

power source before using the

vehicle.

●The 12-volt battery may dis-

charge. In this event, charge the

12-volt battery. (P.589)

In order to prevent the hybrid bat-

tery (traction battery) from becom-

ing extremely low in charge,

81

2-1. Plug-in hybrid system

charge the hybrid battery (traction

battery) from external power

source or start the hybrid system

at least once every 2 or 3 months,

and turn the power switch off after

the gasoline engine has stopped

automatically. (If the gasoline

engine does not start up even

after approximately 10 seconds

have passed since the “READY”

indicator came on, the power

switch can be turned to off without

any further action.)

ing System is installed on the front

of the vehicle, it may be more diffi-

cult to hear from the rear of the vehi-

cle compared to the front.

■When “Acoustic Vehicle Alert-

ing System Malfunction Visit

your Dealer” is displayed on the

multi-information display

The Acoustic Vehicle Alerting Sys-

tem may be malfunctioning. Have

the vehicle inspected by your

Toyota dealer immediately.

2

When the 12-volt battery is dis-

charged, refer to P.589, “If the 12-

volt battery is discharged” and

perform the correction procedure.

Predictive efficient drive

(vehicles with navigation

*

●When the vehicle is left with the

AC charging cable connected, the

electricity consumption amount of

the 12-volt battery increases due

to controls, such as the system

checking, operating. When the AC

charging cable is not needed,

remove it from the vehicle.

system)

*

: This function can only be used in

the mainland U.S.A. It cannot be

used in other states and territo-

ries, including Alaska and Hawaii.

This system operates based on

the driving situation and traffic

information to enhance fuel

economy.

Acoustic Vehicle Alerting

System

For details about Predictive effi-

cient drive, refer to “MULTIME-

DIA OWNER’S MANUAL”.

When driving with the gasoline

engine stopped, a sound, which

changes in accordance with the

driving speed, will be played in

order to warn people nearby of

the vehicle’s approach. The

sound will stop when the vehicle

speed exceeds approximately

22 mph (35 km/h).

■ Predictive deceleration sup-

port

 When the vehicle approaches

to predictive deceleration sup-

port points registered in the

navigation system, the refer-

A

ence operation range ( ) of

■Acoustic Vehicle Alerting Sys-

tem

the ECO Accelerator Guid-

ance (P.163) on the multi-

information display will be

turned off to encourage the

driver to reduce excessive

acceleration.

In the following cases, the Acoustic

Vehicle Alerting System may be dif-

ficult for surrounding people to hear.

●In very noisy areas

●In the wind or the rain

Also, as the Acoustic Vehicle Alert-

82

2-1. Plug-in hybrid system

 The engine braking force will

be increased according to the

driving conditions to more effi-

ciently charge the hybrid bat-

tery (traction battery) after the

accelerator pedal is released.

83

2-1. Plug-in hybrid system

Plug-in hybrid system precautions

Take care when handling the hybrid system, as it contains a

high voltage system (about 650V at maximum) as well as

parts that become extremely hot when the hybrid system is

operating. Obey the caution labels attached to the vehicle.

System components

2

The illustration is an example for explanation and may differ from the actual

item.

A

Caution label

B

High voltage cables (orange)

C

AC charging inlet

D

Onboard traction battery charger

E

Service plug

F

Hybrid battery (traction battery)

G

Electric motor (traction motor)

H

Power control unit and DC/DC converter

I

Air conditioning compressor

84

2-1. Plug-in hybrid system

battery (traction battery) is charged.

This is a natural characteristic of

lithium-ion batteries, and is not a

malfunction. Also, even though the

EV driving range becomes shorter

when the hybrid battery (traction

battery) capacity reduces, vehicle

performance does not significantly

become worse.

■Running out of fuel

When the vehicle has run out of fuel

and the hybrid system cannot be

started, refuel the vehicle with at

least enough gasoline to make the

low fuel level warning light (P.562)

go off. If there is only a small

amount of fuel, the hybrid system

may not be able to start. (The stan-

dard amount of fuel is about 2.1 gal.

[8.0 L, 1.8 Imp.gal.], when the vehi-

cle is on a level surface. This value

may vary when the vehicle is on a

slope. Add extra fuel when the vehi-

cle is inclined.)

In order to reduce the possibility of

the capacity reducing, follow the

directions listed on P.113, “Capacity

reduction of the hybrid battery (trac-

tion battery)”.

■Starting the hybrid system in an

extremely cold environment

■Electromagnetic waves

When the hybrid battery (traction

battery) is extremely cold (below

approximately -22°F [-30°C]) under

the influence of the outside tem-

perature, it may not be possible to

start the hybrid system. In this case,

try to start the hybrid system again

after the temperature of the hybrid

battery increases due to the outside

temperature increase etc.

●High voltage parts and cables on

the Plug-in Hybrid Electric Vehi-

cles incorporate electromagnetic

shielding, and therefore emit

approximately the same amount

of electromagnetic waves as con-

ventional gasoline powered vehi-

cles or home electronic

appliances.

●Your vehicle may cause sound

interference in some third party-

produced radio parts.

WARNING

■High voltage precautions

■Effect of magnetic forces

The vehicle has high voltage DC

and AC systems as well as a 12-

volt system. DC and AC high volt-

age is very dangerous and can

cause severe burns and electric

shock that may result in death or

serious injury.

If objects that generate strong mag-

netic forces, such as large speak-

ers, are placed inside the luggage

compartment or installed nearby,

the generated magnetic forces may

negatively affect the hybrid system.

■Hybrid battery (traction battery)

(lithium-ion battery)

●Never touch, disassemble,

remove or replace the high volt-

age parts, cables or their con-

nectors.

The hybrid battery (traction battery)

has a limited service life.

The hybrid battery (traction battery)

capacity (the ability to hold a

●The hybrid system will become

hot after starting as the system

uses high voltage. Be careful of

both the high voltage and the

high temperature, and always

obey the caution labels

charge) reduces with time and use

in the same way as other recharge-

able batteries. The extent at which

capacity reduces changes drasti-

cally depending on the environment

(ambient temperature, etc.) and

usage conditions, such as how the

vehicle is driven and how the hybrid

attached to the vehicle.

85

2-1. Plug-in hybrid system

●If electrolyte is leaking from the

hybrid battery (traction battery),

do not approach the vehicle.

Even in the unlikely event that

the hybrid battery (traction bat-

tery) is damaged, the internal

construction of the battery will

prevent a large amount of elec-

trolyte from leaking out. How-

ever, any electrolyte that does

leak out will give off a vapor.

This vapor is an irritant to skin

WARNING

●Never try to open the service

plug access hole located in the

luggage compartment. The ser-

vice plug is used only when the

vehicle is serviced and is sub-

ject to high voltage.

and eyes and could cause acute

poisoning if inhaled.

2

●Do not bring burning or high-

temperature items close to the

electrolyte. The electrolyte may

ignite and cause a fire.

■Road accident cautions

Observe the following precautions

to reduce the risk of death or seri-

ous injury:

●If a fire occurs in the Plug-in

Hybrid Electric Vehicle, leave

the vehicle as soon as possible.

Never use a fire extinguisher

that is not meant for electric

fires. Using even a small

amount of water may be dan-

gerous.

●Stop the vehicle in a safe place

to prevent subsequent acci-

dents. While depressing the

brake pedal, apply the parking

brake and shift the shift position

to P to stop the Plug-in hybrid

system. Then, slowly release

the brake pedal.

●If your vehicle needs to be

towed, do so with front wheels

raised. If the wheels connected

to the electric motor (traction

motor) are on the ground when

towing, the motor may continue

to generate electricity. This may

cause a fire. (P.550)

●Do not touch the high voltage

parts, cables and connectors.

●If electric wires are exposed

inside or outside your vehicle,

an electric shock may occur.

Never touch exposed electric

wires.

●Carefully inspect the ground

under the vehicle. If you find

that liquid has leaked onto the

ground, the fuel system may

have been damaged. Leave the

vehicle as soon as possible.

●Do not touch the battery if liquid

is leaking from or adhering to it.

If electrolyte (carbonic-based

organic electrolyte) from the

hybrid battery (traction battery)

comes into contact with the

eyes or skin, it could cause

blindness or skin wounds. In the

unlikely event that it comes into

contact with the eyes or skin,

wash it off immediately with a

large amount of water, and seek

immediate medical attention.

■Hybrid battery (traction bat-

tery)

●Your vehicle contains a sealed

lithium-ion battery.

86

2-1. Plug-in hybrid system

WARNING

■Caution while driving

If the vehicle under floor area

receives strong shock or impact

while driving, stop the vehicle in a

safe area and check around the

bottom of the vehicle. If there is

damage to the hybrid battery

(traction battery) or liquid leakage,

it may lead to a vehicle fire, etc.

Do not touch the vehicle and

immediately contact your Toyota

dealer.

Even if no damage can be seen

under the floor, the hybrid battery

(traction battery) may be dam-

aged. If the vehicle under floor

area receives strong shock or

impact, have the hybrid battery

(traction battery) inspected by

your Toyota dealer.

●Never resell, hand over or mod-

ify the hybrid battery. To prevent

accidents, hybrid batteries that

have been removed from a dis-

posed vehicle are collected

through Toyota dealer. Do not

dispose of the battery yourself.

Unless the battery is properly

collected, the following may

occur, resulting in death or seri-

ous injury:

• The hybrid battery may be ille-

gally disposed of or dumped,

and it is hazardous to the envi-

ronment or someone may touch

a high voltage part, resulting in

an electric shock.

• The hybrid battery is intended to

be used exclusively with your

Hybrid Electric Vehicle. If the

hybrid battery is used outside of

your vehicle or modified in any

way, accidents such as electric

shock, heat generation, smoke

generation, an explosion and

electrolyte leakage may occur.

When reselling or handing over

your vehicle, the possibility of

an accident is extremely high

because the person receiving

the vehicle may not be aware of

these dangers.

■Modifications

Do not modify the vehicle to make

the height lower.

It is easier for the hybrid battery

(traction battery) in the under floor

area to come in contact with the

ground when the vehicle is low-

ered. If the hybrid battery (traction

battery) is damaged, a vehicle fire

may occur which could lead to

death or serious injury.

NOTICE

●If your vehicle is disposed of

without the hybrid battery hav-

ing been removed, there is a

danger of serious electric shock

if high voltage parts, cables and

their connectors are touched. In

the event that your vehicle must

be disposed of, the hybrid bat-

tery must be disposed of by

your Toyota dealer or a qualified

service shop. If the hybrid bat-

tery is not disposed of properly,

it may cause electric shock that

can result in death or serious

injury.

■Notice about fuel

●For Plug-in Hybrid Electric Vehi-

cles, fuel may remain in the tank

for a long time and undergo

changes in quality depending

on the how the vehicle is used.

Refuel at least 5.3 gal. (20 L,

4.4 Imp.gal.) of fuel every 12

months (refuel a total of at least

5.3 gal. [20 L, 4.4 Imp.gal.] over

a 12-month period), as this may

affect components of the fuel

system or the gasoline engine.

87

2-1. Plug-in hybrid system

NOTICE

●If the vehicle has not been refu-

eled for a certain amount of time

and it is possible that the quality

of the fuel remaining in the tank

has changed, “No New Fuel has

been Added Recently Please

refuel” is displayed on the multi-

information display when the

power switch is turned to ON. If

the message is displayed, refuel

the vehicle immediately.

■If a warning light comes on, a

2

warning message is displayed

or the 12-volt battery is discon-

nected

Emergency shut off sys-

tem

The hybrid system may not start. In

that case, try to start the system

again. If the “READY” indicator does

not come on, contact your Toyota

dealer.

When a certain level of impact is

detected by the impact sensor,

the emergency shut off system

blocks off the high voltage cur-

rent and stops the fuel pump to

minimize the risk of electrocu-

tion and fuel leakage.

If the emergency shut off system

activates, your vehicle will not

restart. To restart the hybrid sys-

tem, contact your Toyota dealer.

Hybrid warning message

A message is automatically dis-

played when a malfunction

occurs in the hybrid system or

an improper operation is

attempted.

If a warning message is shown

on the multi-information display,

read the message and follow the

instructions.

88

2-1. Plug-in hybrid system

Plug-in Hybrid Elec -

tric Vehicle driving

tips

Changing the shift posi-

tion

Shift the shift position to D when

stopped at a traffic light, or driv-

ing in heavy traffic etc. Shift the

shift position to P when parking.

When using the N, there is no

positive effect on fuel consump-

tion. In the N, the gasoline

engine operates but electricity

cannot be generated. Also,

when using the air conditioning

system, etc., the hybrid battery

(traction battery) power is con-

sumed.

For economical and ecolog-

ical driving, pay attention to

the following points:

Using EV mode, AUTO

EV/HV mode and HV

mode effectively

Primarily using EV mode and

AUTO EV/HV mode when driv-

ing in cities and using HV mode

when driving on highways (or

freeways) can help conserve

fuel and electricity. (P.74)

Accelerator pedal/brake

pedal operation

 Drive your vehicle smoothly.

Avoid abrupt acceleration and

deceleration. Gradual accel-

eration and deceleration will

make more effective use of

the electric motor (traction

motor) without having to use

gasoline engine power.

Using Eco drive mode

When using Eco drive mode, the

torque corresponding to the

accelerator pedal depression

amount can be generated more

smoothly than it is in normal

conditions. In addition, the oper-

ation of the air conditioning sys-

tem (heating/cooling) will be

minimized, improving fuel and

electricity economy. (P.422)

 Avoid repeated acceleration.

Repeated acceleration con-

sumes hybrid battery (trac-

tion battery) power, resulting

in poor fuel consumption. Bat-

tery power can be restored by

driving with the accelerator

pedal slightly released.

Use of Hybrid System

Indicator

Eco-friendly driving is possible

by keeping the Hybrid System

Indicator within Eco area.

(P.158)

When braking

Make sure to operate the brakes

89

2-1. Plug-in hybrid system

it is recommended to drive in

HV mode while on the free-

way and change to EV mode

or AUTO EV/HV mode after

leaving the freeway. (P.74)

gently and a timely manner.

A greater amount of electrical

energy can be regenerated

when slowing down.

Delays

Air conditioning

Repeated acceleration and

 Turn the “A/C” switch off

when it is not needed. Doing

so can help reduce excessive

electricity and fuel consump-

tion.

deceleration, as well as long

waits at traffic lights, will lead to

high fuel and electricity con-

sumption. Check traffic reports

before leaving and avoid delays

as much as possible. When driv-

ing in a traffic jam, gently

2

In summer: When the ambient tem-

perature is high, use the recircu-

lated air mode. Doing so will help to

reduce the burden on the air condi-

tioning system and reduce electric-

ity and fuel consumption as well.

release the brake pedal to allow

the vehicle to move forward

slightly while avoiding overuse

of the accelerator pedal. Doing

so can help control excessive

electricity and fuel consumption.

In winter: Avoid excessive and

unnecessary use of the heater.

Usage of the heated steering wheel

(if equipped) and seat heaters (if

equipped) are effective. (P.443)

Highway driving

 Control and maintain the vehi-

cle at a constant speed.

Checking tire inflation

pressure

Before stopping at a toll booth

or similar, allow plenty of time

to release the accelerator and

gently apply the brakes. A

greater amount of electrical

energy can be regenerated

when slowing down.

Make sure to check the tire infla-

tion pressure frequently. If there

is improper tire inflation pres-

sure in the tires, the EV driving

range will become shorter, and

fuel consumption when in HV

mode will increase.

 Electricity consumption will

increase significantly when

driving at high speeds in EV

mode or AUTO EV/HV mode.

If there will be a long distance

to the next external charging

point after leaving a freeway,

Also, as snow tires can cause

large amounts of friction, their

use on dry roads can lead to

increased fuel and electricity

consumption.

90

Luggage

2-1. Plug-in hybrid system

EV driving range

Carrying heavy luggage will lead

to poor fuel economy. Avoid car-

rying unnecessary luggage.

The EV driving range dis-

played on the meter shows

the reference distance that

EV driving (driving using

only the electric motor) is

possible, and the actual dis-

tance that can be driven

may differ from that dis-

played.

Installing a large roof rack will

also cause poor fuel economy.

Warming up before driv-

ing

Since the gasoline engine starts

up and cuts out automatically,

warming up is not necessary.

Even if the EV driving range is

displayed, EV driving may be

canceled and both gasoline

engine and electric motor are

used depending on the situa-

tion. (P.79)

Displayed value

The value displayed on the SOC

(State of Charge) gauge

(P.155) is estimated from the

following information.

 The amount of hybrid battery

(traction battery) charge cur-

rently remaining

 The electricity consumption

(the estimated distance that

EV driving is possible per unit

of electrical energy) based on

the recorded value

 Past air conditioning system

electricity consumption

amount

The electricity consumption var-

ies depending on how the vehi-

cle is driven. The vehicle

91

2-1. Plug-in hybrid system

of occupants.

automatically records the elec-

tricity consumption when being

charged and uses the electricity

consumption for estimating the

EV driving range. Therefore, the

EV driving range displayed

The distance that EV driving is

possible can be extended if the

following is performed:

■ When starting off, depress

the accelerator pedal

smoothly to accelerate

when the hybrid battery (traction

battery) is fully charged may dif-

fer from the previous EV driving

range depending on how the

vehicle was driven.

As a guide, accelerate up to

approximately 12mph (20 km/h)

in the first 5 seconds.

2

Electrical and fuel efficiency can

be improved just by using the

ECO Accelerator Guidance dis-

played on the multi-information

display and taking care to start

off gently. (P.163)

The EV driving range may

change significantly with each

charging until the electricity con-

sumption based on the recorded

value is stable (for approxi-

mately the first month or two).

However, this does not indicate

a malfunction.

When the driving mode is set to

Eco drive mode, depressing the

accelerator pedal generates

When the air conditioning sys-

tem is turned on, the EV driving

range (with using the air condi-

tioning system) is estimated

based on the past air condition-

ing electricity consumption

amount considering that the

electricity consumption may

become higher.

smooth torque that makes it easier

to operate the accelerator gently.

At the same time, the air condition-

ing control is switched to eco air

conditioning mode (P.437) to

reduce the strength of the air condi-

tioning operation.

■ Maintain sufficient vehicle-

to-vehicle distance and do

not accelerate or decelerate

unnecessarily

Tips for extending the EV

driving range

Try to maintain a fixed speed

while driving. Driving at a short

vehicle-to-vehicle distance will

result in repeating wasteful

acceleration and deceleration,

which will worsen the electrical

and fuel efficiency.

The distance that EV driving is

possible varies significantly

depending on how the vehicle is

driven, road conditions, the

weather, the outside tempera-

ture, usage conditions of electri-

cal components and the number

92

2-1. Plug-in hybrid system

■ Release the accelerator

pedal early before stopping

the vehicle, such as at a

traffic light

When eco air conditioning mode

is used, the air conditioning con-

trol is switched automatically to

a lower setting. (P.437)

The regenerative brake will

The heated steering wheel and

seat heaters are efficient heat-

ing device that directly warm the

body using less electric power.

operate to convert the kinetic

energy of the vehicle into electri-

cal energy, which will charge the

hybrid battery (traction battery).

When used together with the air

conditioning system, a low tem-

perature setting can be used to

improve electrical and fuel effi-

ciency.

The regeneration status can be

checked from the Hybrid Sys-

tem Indicator. (P.158)

When the brake pedal is

depressed lightly during decel-

eration, the regeneration

amount increases, enabling

more electrical energy to be

recovered.

■ Check the tire pressure

If the tire pressure is lower than

the specified value, it will

worsen the electrical and fuel

efficiency.

A pressure level 7 psi (50 kPa, 0.5

2

If the brake pedal is depressed too

strongly, the recovered amount

indicator will reach the maximum

level and the upper limit of the

recoverable energy will be

kgf/cm or bar) lower than the spec-

ified value will cause a worsening of

several percentage points.

■ When driving on highways,

use the EV/HV mode selec-

tion switch to drive in HV

mode

exceeded. Therefore, be sure to

operate the brake pedal early.

■ Use the air conditioning

system appropriately, and

also utilize the heated steer-

ing wheel (if equipped) and

seat heaters (if equipped)

The power consumption will

increase significantly if the vehi-

cle is driven in EV mode on

highways.

In EV mode, the vehicle is

■ Do not load unnecessary

objects in the vehicle

cooled and heated by electrical

energy. (Except in extremely

cold temperatures of approxi-

mately 14°F [-10°C] or less.)

Driving with objects weighing

220 lb. (100 kg) in the vehicle

will worsen the electrical and

fuel efficiency by approximately

3%.

Preventing excessive cooling or

heating of the vehicle will reduce

power consumption and

Air resistance also greatly

improve electrical efficiency.

93

2-1. Plug-in hybrid system

affects electrical and fuel effi-

ciency. Remove any exterior

accessories such as a roof lug-

gage carrier when they are not

being used.

schedule function is used,

charging is completed if the

above can be confirmed.

Charging-related messages:

P.143

The running resistance of snow

tires is high and they will worsen

electrical and fuel efficiency.

Replace them with standard

tires as soon as they are no lon-

ger needed.

2

■ Know your vehicle’s electri-

cal and fuel efficiency

If you know your vehicle’s daily

electrical and fuel efficiency, you

will understand the benefits of

Eco drive.

Use the Power Consump-

tion/Fuel Economy, ECO Accel-

erator Guidance/“Eco Score”

and other data displayed on the

multi-information display.

Display when charging is

completed

The following indicate that

charging has been carried out

properly.

 The charging indicator of the

charging port turns off

 “Charging Complete” is dis-

played on the multi-informa-

tion display when a door is

opened with the power switch

off (P.112)

Regardless of the type of power

source or whether the charging

Plug-inhybridsystem -> 2-1. Plug-in hybrid system for Your Toyota Prius 4 Door Fifth Generation (2023-2026)

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