2022 TOYOTA TUNDRA HYBRID Owners Manual

731-4. Hybrid system
Owners Manual_USA_M0C031_en
1
For safety and security
1-4.Hybrid system
■System components
The illustration is an example fo r explanation and may differ from the actual
item.
Gasoline engine
Electric motor (traction motor)
■When stopped/during start
off
The gasoline engine stops
* when the vehicle is stopped.
During start off, the electric
motor (traction motor) drives the
Hybrid system features
Your vehicle is a Hybrid Electric Vehicle. It has characteristi
cs
different from conventional vehicles. Be sure you are closely
familiar with the characteristics of your vehicle, and operate it
with care.
The hybrid system combines the use of a gasoline engine and
an electric motor (traction motor) according to driving condi-
tions, improving fuel efficiency and reducing exhaust emis-
sions.
System components

741-4. Hybrid system
Owners Manual_USA_M0C031_en
vehicle. At slow speeds or when
traveling down a gentle slope,
the engine is stopped
* and the
electric motor (traction motor) is
used.
*: When the hybrid battery (traction battery) requires charging or the
engine is warming up, etc., the
gasoline engine will not automati-
cally stop. ( P. 7 4 )
■During normal driving
The gasoline engine is predomi-
nantly used. The electric motor
(traction motor) charges the
hybrid battery (traction battery)
as necessary.
■When accelerating sharply
When the accelerator pedal is
depressed heavily, the power of
the hybrid battery (traction bat-
tery) is added to that of the gas-
oline engine via the electric
motor (traction motor).
■When braking (regenera-
tive braking)
The wheels operate the electric
motor (traction motor) as a
power generator, and the hybrid
battery (traction battery) is
charged.
■Regenerative braking
●In the following si tuations, 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 lever in D or S.
• The brake pedal is depressed while driving with t he shift lever in
D or S.
■Conditions in which the gaso-
line engine may not stop
The gasoline engine starts and
stops automatically. However, it may
not stop automatic ally in the follow-
ing conditions:
●During gasoline engine warm-up
●During hybrid battery (traction bat-
tery) charging
●When the temperature of the
hybrid battery (traction battery) is
high or low
●When the heater is switched on
●When the “TOW HA UL” switch is
on
●When the “MTS” switch is on
●When the front-wheel drive control
switch is in “4H” or “4L”
●When the hood is opened during
“READY” indicator is illuminated
●When the shift lever is shifted to S
Depending on the circumstances,
the gasoline engine may also not
stop automatically in other situa-
tions.
■Charging the hybrid battery
(traction battery)
As the gasoline engine charges the
hybrid battery (trac tion battery), the
battery does not need to be charged
from an outside source. However, if
the vehicle is left parked for a long
time the hybrid battery (traction bat-
tery) will slowly dis charge. For this
reason, be sure to drive the vehicle
at least once every few months for
at least 30 minutes or 10 miles (16
km). If the hybrid battery (traction
battery) becomes fully discharged
and you are unabl e to start the
hybrid system, contact your Toyota
dealer.

751-4. Hybrid system
Owners Manual_USA_M0C031_en
1
For safety and security
■Charging the 1 2-volt battery
 P. 5 3 1
■After the 12-volt battery has dis-
charged or when the terminal
has been removed and installed
during exchange, etc.
The gasoline engine may not stop
even if the vehicle is being driven by
the hybrid battery (traction battery).
If this continues for a few days, con-
tact your Toyota dealer.
■Sounds and vibrations specific
to a Hybrid Electric Vehicle
There may be no engine sound or
vibration even though the vehicle is
able to move with the “READY” indi-
cator is illuminated. For safety, apply
the parking brake and make sure to
shift the shift lever to P when
parked.
The following sounds or vibrations
may occur when the hybrid system
is operating and are not a malfunc-
tion:
●Motor sounds may be heard from
the engine compartment.
●Sounds may be heard from the
hybrid battery (traction battery)
under the rear seats 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,
when the hybrid system is started
or stopped.
●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 dep ressed or as
the accelerator pedal is released.
●Vibration may be felt when the
gasoline engine starts or stops.
●Cooling fan sounds may be heard
from the air intake vents on the
side of the lower part of the rear
seat.
■Maintenance, repair, recycling,
and disposal
Contact your Toyota dealer regard-
ing maintenance, repair, recycling
and disposal. Do n ot dispose of the
vehicle yourself.
When the gasoline engine is off
while driving, a sound is pro-
duced to warn pedestrians, peo-
ple riding bicycles or other
people and vehicles in the sur-
rounding area that the vehicle is
approaching. The pitch of the
sound adjusts according to vehi-
cle speed. When vehicle speed
is approximately 22 mph (35
km/h) or more, the warning sys-
tem turns off.
■Acoustic vehicle alerting sys-
tem
In the following cases, the acoustic
vehicle alerting system sound may
be difficult for pedestrians, people
riding bicycles or other people and
vehicles in the surrounding area to
hear:
●When there is a lot of noise in the
vicinity
●When it is raining or during strong
winds
Acoustic vehicle alerting
system

761-4. Hybrid system
Owners Manual_USA_M0C031_enThe illustration is an example fo
r explanation and may differ from the actual
item.
Warning label
Service plug
Hybrid battery (traction battery)
High voltage cables (orange)
Electric motor (traction motor)
Air conditioning compressor
Power control unit
Hybrid system precautions
Take care when handling the hybrid system, as it is a high
voltage system (about 288 V at maximum) as well as contains
parts that become extremely hot when the hybrid system is
operating. Obey the warning labels attached to the vehicle.
System components

771-4. Hybrid system
Owners Manual_USA_M0C031_en
1
For safety and security
■Running out of fuel
When the vehicle has run out of fuel
and the hybrid system cannot be
started, refuel th e vehicle with at
least enough gasoline to make the
low fuel level warning light ( P.507)
go off. If there is only a small
amount of fuel, th e hybrid system
may not be able to start. (The stan-
dard amount of fuel is about 21.9 L
[5.8 gal., 4.8 Imp. gal.] when the
vehicle is on a level surface. This
value may vary whe n the vehicle is
on a slope. Add extra fuel when the
vehicle is inclined.)
■Electromagnetic waves
●High voltage parts and cables on
Hybrid Electric Vehicles incorpo-
rate electromagnetic shielding,
and therefore emi t approximately
the same amount of electromag-
netic waves as conventional gaso-
line powered vehicles or home
electronic appliances.
●Your vehicle may cause sound
interference in so me third party-
produced radio parts.
■Hybrid battery (tr action battery)
The hybrid battery (traction battery)
has a limited service life. The lifes-
pan of the hybrid battery (traction
battery) can change in accordance
with driving style and driving condi-
tions.
■Starting the hybrid system in an
extremely cold environment
When the hybrid battery (traction
battery) is extremely cold (below
approximately -31°F [-35°C]) under
the influence of t he outside tem-
perature, it may no t 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.
WARNING
■High voltage precautions
This 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.
●Never touch, disassemble,
remove or replace the high volt-
age parts, cables or their con-
nectors.
●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 warning labels
attached to the vehicle.
●Never try to open the service
plug access hole located under
the right side o f the rear seat.
The service plug is used only
when the vehicle is serviced
and is subject to high voltage.
■Road accident cautions
Observe the following precautions
to reduce the risk of death or seri-
ous injury:
●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 lever to
P to stop the hybrid system.
Then, slowly release the brake
pedal

781-4. Hybrid system
Owners Manual_USA_M0C031_en
WARNING
●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.
●If a fire occurs in the Hybrid
Electric Vehicle, leave the vehi-
cle 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 dangerous.
●If your vehicle needs to be
towed, do so with the rear
wheels raised. If the wheels
connected to the electric motor
(traction motor) are on the
ground when towing, the motor
may continue to generate elec-
tricity. This may cause a fire.
(  P.497)
●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.
●If a fluid leak occurs, do not
touch the fluid as it may be
strong alkaline electrolyte from
the hybrid battery (traction bat-
tery). If it comes into contact
with your skin or eyes, wash it
off immediately with a large
amount of water or, if possible,
boric acid solution. Seek imme-
diate medical attention.
■Hybrid battery (traction bat-
tery)
●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 your Toyota dealer. Do
not dispose of the battery your-
self.
Unless the battery is properly col-
lected, the following may occur,
resulting in dea th or serious
injury:
• The hybrid batte ry 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.
●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. If the hybrid
battery is not disposed of prop-
erly, it may cause electric shock
that can result in death or seri-
ous injury.

791-4. Hybrid system
Owners Manual_USA_M0C031_en
1
For safety and security
There are an air intake vents
under the rear seat for the pur-
pose of cooling the hybrid bat-
tery (traction battery). If the
vents becomes blocked, the
hybrid battery (traction battery)
input and output may be
reduced. When a certain level of impact is
detected by the impact sensor,
the emergency shut off system
blocks the high voltage current
and stops the fuel pump to mini-
mize the risk of electrocution
and fuel leakage. If the emer-
gency shut off system activates,
your vehicle will not restart. To
restart the hybrid system, con-
tact your Toyota dealer.
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,
NOTICE
■Hybrid battery (traction bat-
tery) air intake vents
Do not carry large amounts of
water such as water cooler bottles
in the vehicle. If water spills onto
the hybrid battery (traction bat-
tery), the batte ry may be dam-
aged. Have the vehicle inspected
by your Toyota dealer.
Hybrid battery (traction
battery) air intake vents
NOTICE
■Hybrid battery (traction bat-
tery) air intake vents
●Make sure that the air intake
vents are not blocked, such as
by a seat cover, plastic cover, or
luggage. If the vents are
blocked, the hybrid battery
(traction battery) input and out-
put may be restricted, possibly
leading to a malfunction.
●Clean the air intake vents regu-
larly to prevent the hybrid bat-
tery (traction b attery) from
overheating.
●Do not get water or foreign
materials in the air intake vents
as this may cause a short circuit
and damage the hybrid battery
(traction battery).
●A filter is installed to the air
intake vents. When the filter
remains noticeably dirty even
after cleaning the air intake
vents, filter cleaning or replace-
ment is recommended. Refer to
P.481 for details on how to
clean the filters.
Emergency shut off sys-
tem
Hybrid warning message

801-4. Hybrid system
Owners Manual_USA_M0C031_en
read the message and follow the
instructions.
■If a warning light comes on, a
warning message is displayed,
or the 12-volt battery is discon-
nected
The hybrid system may not start. In
this case, try to start the system
again. If the “READY” indicator does
not come on, contact your Toyota
dealer.