brake TOYOTA TUNDRA HYBRID 2023 Owners Manual

4606-3. Do-it-yourself maintenance
Owners Manual_USA_M0C052_en
The coolant level is satisfactory
if it is between the “F” and “L”
lines on the reservoir when the
hybrid system is cold.
Engine coolant Engine coolant reservoir cap
“F” line
“L” line
If the level is on or below the “L”
line, add coolant up
to the “F” line.
(  P.535)
Intercooler coolant
Intercooler coolant reservoir
cap
“F” line
“L” line
If the level is on or below the “L”
line, add coolant up to the “F” line.
(  P.535)
Power control unit coolant
Power control unit coolant
reservoir cap
“FULL” line
NOTICE
■To prevent serious engine
damage
Check the oil level on a regular
basis.
■When replacing the engine oil
●Be careful not to spill engine oil
on the vehicle components.
●Avoid overfilling, or the engine
could be damaged.
●Check the oil le vel on the dip-
stick every time you refill the
vehicle.
●Be sure the engine oil filler cap
is properly tightened.
■If oil is spilled on the engine
cover
To prevent the engine cover from
being damaged, remove any
engine oil from the engine cover
as soon as possible using a neu-
tral detergent. Do not use an
organic solvent such as brake
cleaner.
Checking the coolant

4616-3. Do-it-yourself maintenance
Owners Manual_USA_M0C052_en
6
Maintenance and care
“LOW” line
If the level is on or below the “LOW”
line, add coolant up to the “FULL”
line. ( P.535)
■Coolant selection
Only use “Toyota Super Long Life
Coolant” or a similar high quality
ethylene glycol based non-silicate,
non-amine, non-nitrite, and non-
borate coolant with long-life hybrid
organic acid technology.
U.S.A.:“Toyota Super Long Life
Coolant” is a mixture of 50% coolant
and 50% deionized water.
(Minimum temperature: -31°F [-
35°C])
Canada: “Toyota Super Long Life
Coolant” is a mixture of 55% coolant
and 45% deionized water.
(Minimum temperature: -44°F [-
42°C])
For more details about coolant, con-
tact your Toyota dealer.
■If the coolant level drops within
a short time of replenishing
Visually check the radiator, hoses,
engine coolant reser voir cap, inter-
coolant reservoir cap, drain cock
and water pump.
If you cannot find a leak, have your
Toyota dealer test the cap and
check for leaks in the cooling sys-
tem.
Check the radiator, condenser
and intercooler radiators and
clear away any foreign objects.
If either of the above parts is
extremely dirty or you are not
sure of their condition, have
your vehicle inspected by your
Toyota dealer.
■Checking fluid level
The brake fluid level should be
between the “MAX” and “MIN”
WARNING
■When the hybrid system is
hot
Do not remove the coolant reser-
voir cap.
The cooling system may be under
pressure and may spray hot cool-
ant if the cap is removed, causing
serious injuries, such as burns.
NOTICE
■When adding coolant
Coolant is neither plain water nor
straight antifreeze. The correct
mixture of water and antifreeze
must be used to provide proper
lubrication, corrosion protection
and cooling. Be sure to read the
antifreeze or coolant label.
■If you spill coolant
Be sure to wash it off with water to
prevent it from damaging parts or
paint.
Checking the radiator,
condenser and inter-
cooler radiators
WARNING
■When the hybrid system is
hot
Do not touch the radiator, con-
denser or intercooler radiators or
condenser as they may be hot
and cause serious injuries, such
as burns.
Checking and adding the
brake fluid

4626-3. Do-it-yourself maintenance
Owners Manual_USA_M0C052_en
lines on the tank.
Brake fluid reservoir cap
“MAX” line
“MIN” line
■Adding fluid
Make sure to check the fluid
type and prepare the necessary
item.
 Fluid type
FMVSS No.116 DOT 3 or SAE
J1703 brake fluid
FMVSS No.116 DOT 4 or SAE
J1704 brake fluid
Item
Clean funnel
■Brake fluid can absorb moisture
from the air
Excess moisture in the brake fluid
can cause a dangerous loss of brak-
ing efficiency. Use only newly
opened brake fluid.
If any washer does not work the
washer tank may be empty. Add
washer fluid.
WARNING
■When filling the reservoir
Take care as brake fluid can harm
your hands and eyes and damage
painted surfaces.
If fluid gets on your hands or in
your eyes, flush the affected area
with clean water immediately.
If you still experi ence discomfort,
see a doctor.
NOTICE
■If the fluid level is low or high
It is normal for the brake fluid level
to go down slight ly as the brake
pads wear out or when the fluid
level in the accumulator is high.
If the reservoir needs frequent
refilling, there m ay be a serious
problem.
Adding the washer fluid
WARNING
■When adding washer fluid
Do not add washer fluid when the
hybrid system is hot or operating
as washer fluid contains alcohol
and may catch fire if spilled on the
hybrid system, etc.

4646-3. Do-it-yourself maintenance
Owners Manual_USA_M0C052_entery installed on the vehicle, be
sure to disconnect the ground
cable.
●Make sure the power switch on
charger is off when connecting
and disconnecting the charger
cables to the 12-volt battery.
■After recharging/reconnecting
the 12-volt battery
●Unlocking the doors using the
smart key system may not be pos-
sible immediately after reconnect-
ing the 12-volt battery. If this
happens, use the wireless remote
control or the mechanical key to
lock/unlock the doors.
●Start the hybrid system with the
power switch in ACC. The hybrid
system may not start with the
power switch turned off. However,
the hybrid system will operate nor-
mally from the second attempt.
●The power switch mode is
recorded by the vehicle. If the 12-
volt battery is
reconnected, the
vehicle will return the power
switch mode to the status it was in
before the 12-volt battery was dis-
connected. Make sure to turn off
the power switch before discon-
necting the 12-volt battery. Take
extra care when connecting the
12-volt battery if the power switch
mode prior to discharge is
unknown.
●When the 12-volt b attery is recon-
nected, start the hybrid system,
depress the brake pedal, and con-
firm that it is possible to shift into
each shift position.
If the system will not start even after
multiple attempts, contact your Toy-
ota dealer.
WARNING
■Chemicals in the 12-volt bat-
tery
The 12-volt battery contains poi-
sonous and corrosive sulfuric acid
and may produce hydrogen gas
which is flammable and explosive.
To reduce the risk of death or seri-
ous injury, take the following pre-
cautions while working on or near
the 12-volt battery:
●Do not cause sparks by touch-
ing the 12-volt battery terminals
with tools.
●Do not smoke or light a match
near the 12-volt battery.
●Avoid contact with eyes, skin
and clothes.
●Never inhale or swallow electro-
lyte.
●Wear protective safety glasses
when working near the 12-volt
battery.
●Keep children away from the
12-volt battery.
■Where to safely charge the
12-volt battery
Always charge the 12-volt battery
in an open area. Do not charge
the 12-volt battery in a garage or
closed room where there is insuf-
ficient ventilation.
■Emergency measures regard-
ing electrolyte
●If electrolyte gets in your eyes
Flush your eyes with clean
water for at least 15 minutes
and get immediate medical
attention. If possible, continue
to apply water with a sponge or
cloth while traveling to the near-
est medical facility.

4947-1. Essential information
Owners Manual_USA_M0C052_en
7-1.Essential information
Press the switch to flash all of
the turn signal lights.
To turn them off, press the switch
once again.
■Emergency flashers
●If the emergency flashers are
used for a long time while the
hybrid system is not operating, the
12-volt battery may discharge.
●If any of the SRS airbags deploy
(inflate) or in the event of a strong
rear impact, the emergency flash-
ers will turn on automatically.
The emergency flashers will turn
off automatically after operating
for approximately 20 minutes. To
manually turn t he emergency
flashers off, press the switch
twice.
(The emergency flashers may not
turn on automatically depending
on the force of the impact and
conditions of the collision.)
1 Steadily step on the brake
pedal with both feet and
firmly depress it.
Do not pump the brake pedal
repeatedly as this will increase the
effort required to slow the vehicle.
2Shift the shift lever to N.
If the shift lever is shifted to N
3 After slowing down, stop the
vehicle in a safe place by the
road.
4 Stop the hybrid system.
If the shift lever cannot be
shifted to N
3 Keep depressing the brake
pedal with both feet to reduce
vehicle speed as much as
possible.
4 To stop the hybrid system,
press and hold the power
switch for 2 consecutive sec-
onds or more, or press it
Emergency flashers
The emergency flashers are
used to warn other drivers
when the vehicle has to be
stopped on the road due to
a breakdown, etc.
Operating instructions
If your vehicle has to
be stopped in an emer-
gency
Only in an emergency, such
as if it becomes impossible
to stop the vehicle in the
normal way, stop the vehicle
using the following proce-
dure:
Stopping the vehicle

4997-2. Steps to take in an emergency
Owners Manual_USA_M0C052_en
7
When trouble arises
When using a flat-bed truck to
transport the vehicle, use tire
strapping belts. Refer to the
owner’s manual of the flat-bed
truck for the tire strapping
method.
In order to suppress vehicle
movement during transporta-
tion, set the parking brake and
turn the power switch off.
Your vehicle has not towing
hook. If towing is necessary, we
recommend having your vehicle
towed by your Toyota dealer or
commercial towing service. 
Fluid leaks under the vehicle.
(Water dripping from the air
conditioning after use is nor-
mal.)
 Flat-looking tires or uneven
tire wear
 Engine coolant temperature
gauge needle continually
points higher than normal.
 Voltmeter continually points
higher or lower than normal.
 Engine oil pressure gauge
continually points lower than
normal.
 Automatic transmission fluid
temperature warning mes-
sage is displayed
 Changes in exhaust sound
 Excessive tire squeal when
cornering
 Strange noises related to the
suspension system
NOTICE
■Towing with a sling-type truck
Do not tow with a sling-type truck
to prevent body damage.
Using a flatbed truck
Emergency towing
If you think something
is wrong
If you notice any of the fol-
lowing symptoms, your
vehicle probably needs
adjustment or repair. Con-
tact your Toyota dealer as
soon as possible.
Visible symptoms
Audible symptoms

5007-2. Steps to take in an emergency
Owners Manual_USA_M0C052_en
Pinging or other noises
related to the engine
 Engine misses, stumbling or
running roughly
 Appreciable loss of power
 Vehicle pulls heavily to one
side when braking
 Vehicle pulls heavily to one
side when driving on a level
road
 Loss of brake effectiveness,
spongy feeling, pedal almost
touches the floor
Operational symptoms

5017-2. Steps to take in an emergency
Owners Manual_USA_M0C052_en
7
When trouble arises
■Brake system warning light (warning buzzer)
■Brake system warning light (warning buzzer)
■High coolant temperature warning light*
*: This light illuminates on the mu lti-information display with a message.
If a war ning light tur ns on or a war ning buzzer
sounds
Calmly perform the following actions if any of the warning
lights comes on or flashes. If a light comes on or flashes, but
then goes off, this does not necessarily indicate a malfunc-
tion in the system. However, if this continues to occur, have
the vehicle inspected by your Toyota dealer.
Actions to the warning lights or warning buzzers
Warning lightDetails/Actions
(U.S.A.)
or
(Red)
(Canada)
Indicates that:
 The brake fluid level is low; or
 The brake system is malfunctioning
 Immediately stop the vehicle in a safe place and con-
tact your Toyota dealer. C ontinuing to drive the vehi-
cle may be dangerous.
Warning lightDetails/Actions
(Yellow)
Indicates a malfunction in:
 The parking brake system;
 The regenerative braking system; or
 The electronically controlled brake system
 Have the vehicle inspecte d by your Toyota dealer
immediately.
Warning lightDetails/Actions
Indicates that the engine is overheating
 Immediately stop the v ehicle in a safe place.
Handling method ( P.535)

5037-2. Steps to take in an emergency
Owners Manual_USA_M0C052_en
7
When trouble arises
■ABS warning light
■Electric power steering system warning light (warning
buzzer)
■PCS warning light
Warning lightDetails/Actions
(U.S.A.)
or
(Canada)
Indicates a malfunction in:
 The ABS; or
 The brake assist system
 Have the vehicle inspecte d by your Toyota dealer
immediately.
Warning lightDetails/Actions
(Red)
or
(Yellow)
Indicates a malfunct ion in the EPS (Electric Power Steer-
ing) system
 Have the vehicle inspecte d by your Toyota dealer
immediately.
Warning lightDetails/Actions
(Flashes or illu- minates)
When a buzzer sounds simultaneously:
Indicates a malfunct ion has occurred in the PCS (Pre-Colli-
sion System).
 Have the vehicle inspecte d by your Toyota dealer
immediately.
When a buzzer does not sound:
The PCS (Pre-Collision Syst em) has become temporarily
unavailable, corrective ac tion may be necessary.
 Follow the instructions dis played on the multi-infor-
mation display. ( P.228, 511)
If the PCS (Pre-Collision Syst em) or VSC (Vehicle Stability
Control) system is disabled, the PCS warning light will illu-
minate.
 P.376

5047-2. Steps to take in an emergency
Owners Manual_USA_M0C052_en
■LTA indicator (warning buzzer)
■Intuitive parking assist OFF indicator (warning buzzer)
■PKSB OFF indicator (warning buzzer)
Warning lightDetails/Actions
(Orange)
Indicates a malfunction in t he LTA (Lane Tracing Assist)
 Follow the instructions dis played on the multi-infor-
mation display. ( P.252)
Warning lightDetails/Actions
(Flashes)
Indicates a malfunction in the i ntuitive parking assist func-
tion
 Have the vehicle inspecte d by your Toyota dealer
immediately.
Indicates that the system is te mporarily unavailable, possi-
bly due to a sensor being dirt y or covered with ice, etc.
 Follow the instructions dis played on the multi-infor-
mation display. ( P.276)
Warning lightDetails/Actions
(Flashes)
When a buzzer sounds:
Indicates a malfun ction in the PKSB ( Parking Support
Brake) system
 Have the vehicle inspecte d by your Toyota dealer
immediately.
When a buzzer does not sound:
Indicates that the system is te mporarily unavailable, possi-
bly due to a sensor being dirt y or covered with ice, etc.
 Follow the instructions dis played on the multi-infor-
mation display. ( P.291)