engine coolant TOYOTA TUNDRA HYBRID 2023 User Guide

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

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

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)

5127-2. Steps to take in an emergency
Owners Manual_USA_M0C052_entems such as PCS (Pre-Collision
system) or the dynamic radar cruise
control with full-speed range is oper-
ating. If a warning message is
shown, be sure to decelerate the
vehicle or follow an instruction
shown on the multi
-information dis-
play.
A warning message is shown when
Brake Override System operates.
(  P.172)
A warning message is shown when
Drive-Start Control ( P.177) or
Parking Support Brake ( P.287)
operates. Follow the instructions on
the multi-information display.
●If a message about an operation
of the power switch is displayed
An instruction for operation of the
power switch is shown when the
incorrect procedure for starting the
hybrid system is performed or the
power switch is operated incorrectly.
Follow the instructions shown on the
multi-information display to operate
the power switch again.
●If a message abou t a shift lever
operation is displayed
To prevent the shift lever from being
operated incorrectly or the vehicle
from moving unexpectedly, a mes-
sage that requires shifting the shift
lever may be sho wn on the multi-
information display . In that case, fol-
low the instruction of the message
and shift the shift lever.
●If a message or image about an
open/close state of a part or
replenishment of a consumable is
displayed
Confirm the part indicated by the
multi-information display or a warn-
ing light, and then perform the cop-
ing method such as closing the open door or replenishing a con-
sumable.
■If a message that indicates the
need for visiting your Toyota
dealer is displayed
The system or part shown on the
multi-information di splay is malfunc-
tioning. Have the vehicle inspected
by your Toyota dealer immediately.
■If a message that indicates the
need for referring to Owner’s
Manual is displayed
●If “Engine Coolant Temp High
Stop in a Safe Place See Owner’s
Manual” is shown, follow the
instructions ( P.535).
●If the following messages are
shown, there may be a malfunc-
tion.
Immediately stop the vehicle in a
safe place and contact your Toy-
ota dealer. Continuing to drive the
vehicle may be dangerous.
• “Hybrid System Malfunction”
• “Check Engine”
• “Traction battery system malfunc- tion”
• “Accelerator System Malfunction”
• “Hybrid System Stopped”
• “Smart Key System Malfunction See Owner’s Manual”
●If the following messages are
shown, there may be a malfunc-
tion.
Immediately have the vehicle
inspected by your Toyota dealer.
• “Oil Pressure Low Stop in a Safe Place See Owner’s Manual”
• “Braking Power Low Stop in a
Safe Place See Owner’s Manual”
●If “Maintenance Required for Trac-
tion Battery Cooling Parts See
Owner’s Manual” is shown, the fil-
ter may be clogged, the air intake
vents may be blo cked, or there
may be a gap in the duct. There-
fore, perform the following correc-
tion procedure.
Cleaning the hybrid battery (traction
battery) air intake vents ( P.481)

5357-2. Steps to take in an emergency
Owners Manual_USA_M0C052_en
7
When trouble arises
■If the engine coolant tem-
perature gauge enters the
red zone or “Engine Cool-
ant Temp High Stop in a
Safe Place See Owner’s
Manual” is shown on the
multi-information display
1 Stop the vehicle in a safe
place and turn off the air con-
ditioning system, and then
stop the hybrid system.
2 If you see steam:
Carefully lift the hood after
the steam subsides.
If you do not see steam:
Carefully lift the hood.
3 After the hybrid system has
cooled down sufficiently,
inspect the hoses, engine
radiator core (radiator) and
intercooler radiator core
(radiator) for any leaks.
If a large amount of coolant leaks,
immediately cont act your Toyota dealer.
Cooling fan
Radiator
Intercooler radiators
4 The coolant level is satisfac-
tory if it is between the “F” or
“FULL” and “L” or “LOW”
lines on the reservoir.
If your vehicle overheats
The following may indicate that your vehicle is overheating.
The needle of the engine coolant temperature gauge ( P.91)
enters the red zone or a loss of engine (hybrid system) power i s
experienced. (For example, the vehicle speed does not
increase.)
 “Engine Coolant Temp High Stop in a Safe Place See Owner’s
Manual” is shown on the multi-information display.
Steam comes out from under the hood.
Correction procedures

5367-2. Steps to take in an emergency
Owners Manual_USA_M0C052_en
Engine
Reservoir
“F” line
“L” line
IntercoolerReservoir
“F” line
“L” line
Power control unitReservoir “FULL” line
“LOW” line
5 Add coolant if necessary.
Water can be used in an emer-
gency if coolant is unavailable.
If water was added in an emer-
gency, have the v ehicle inspected
at your Toyota dealer as soon as
possible.
Engine
Intercooler
Power control unit

5377-2. Steps to take in an emergency
Owners Manual_USA_M0C052_en
7
When trouble arises
6 Start the hybrid system to
check that the radiator cool-
ing fan operates and to check
for coolant leaks from the
radiator or hoses.
7 If the fan is not operating:
Stop the hybrid system
immediately and contact your
Toyota dealer.
If the fan is operating:
Have the vehicle inspected at
the nearest Toyota dealer.
8 Check if “Engine Coolant
Temp High Stop in a Safe
Place See Owner’s Manual”
is shown on the multi-infor-
mation display.
If the message does not disappear:
Stop the hybrid system and contact
your Toyota dealer.
If the message is not displayed:
Have the vehicle i nspected at the
nearest Toyota dealer.
WARNING
■When inspecting under the
hood of your vehicle
Observe the following precau-
tions.
Failure to do so may result in seri-
ous injury such as burns.
●If steam is seen coming from
under the hood, do not open the
hood until the steam has sub-
sided. The engine compart-
ment may be very hot.
●After the hybrid system has
been turned off , check that the
“READY” indicator is off. When
the hybrid system is operating,
the gasoline engine may auto-
matically start, or the cooling fan
may suddenly operate even if
the gasoline engine stops. Do
not touch or approach rotating
parts such as the fan, which
may lead to fingers or clothing
(especially a tie, a scarf or a
muffler) getting caught, resulting
in serious injury.
●Do not loosen the coolant reser-
voir caps, while the hybrid sys-
tem and radiator are hot.
High temperature steam or
coolant could spray out.
NOTICE
■When adding coolant
Add coolant slowly after the
hybrid system has cooled down
sufficiently. Adding cool coolant to
a hot hybrid system too quickly
can cause damage to the hybrid
system.
■To prevent damage to the
cooling system
Observe the following precau-
tions:
●Avoid contaminating the coolant
with foreign matter (such as
sand or dust, etc.,).
●Do not use any coolant additive.

5448-1. Specifications
Owners Manual_USA_M0C052_en
Oil viscosity (0W-20 is explained
here as an example):
• The 0W in 0W-20 indicates the characteristic of the oil
which allows cold startability.
Oils with a lower value before
the W allow for easier starting
of the engine in cold weather.
• The 20 in 0W-20 indicates the viscosity characteristic of the
oil when the oil is at high tem-
perature.
How to read oil container label:
The International Lubricant Specification Advisory Commit-
tee (ILSAC) Certification Mark is
added to some oil containers to
help you select the oil you
should use.
*: The fluid capacity is a reference quantity.
If replacement is necessary, contact your Toyota dealer.
Cooling system
Capacity*
Gasoline
engine13.1 qt. (12.4 L , 10.9 Imp.qt.)
Intercooler4.6 qt. (4.4 L, 3.9 Imp.qt.)
Power con-
trol unit2.2 qt. (2.1 L, 1.8 Imp.qt.)
Coolant type
Use either of the following:
“Toyota Super Long Life Coolant”
 Similar high-quality ethylene glycol-based non-
silicate, non-amine, non- nitrite, and non-borate
coolant with long -life hybrid organic acid tech-
nology
Do not use plain water alone.
Ignition system (spark plug)
MakeDENSO EC22HPR-D7
Gap0.027 in. (0.7 mm)

5558-1. Specifications
Owners Manual_USA_M0C052_en
8
Vehicle specifications
heat buildup and possible tire fail- ure.
Glossary of tire terminology
Tire related termMeaning
Cold tire inflation pressure
Tire pressure when the vehicle has been
parked for three hours or more, or has not
been driven more than 1 mile or 1.5 km
under that condition
Maximum inflation pressure
The maximum cold inf lated pressure to
which a tire may be inflated, shown on the
sidewall of the tire
Recommended inflation pres-
sureCold tire inflation pressure recommended
by a manufacturer
Accessory weight
The combined weight (in excess of those
standard items which may be replaced) of
automatic transmission, power steering,
power brakes, power windows, power
seats, radio and heater, to the extent that
these items are ava ilable as factory-
installed equipment (whether installed or
not)
Curb weight
The weight of a moto r vehicle with stan-
dard equipment, including the maximum
capacity of fuel, oil and coolant, and if so
equipped, air conditioning and additional
weight optional engine
Maximum loaded vehicle
weight
The sum of:
(a) Curb weight
(b) Accessory weight
(c) Vehicle capacity weight
(d) Production options weight
Normal occupant weight
150 lb. (68 kg) times the number of occu-
pants specified in the second column of
Ta b l e 1
* that follows
Occupant distribution
Distribution of occupants in a vehicle as
specified in the third column of Table 1
*
below

Owners Manual_USA_M0C052_en
Alphabetical Index595
Seat belt extender precautions............................................. 30
Seat belt precautions ............. 52
Child-protectors .. ................... 116
Cleaning .......................... 442, 445 Aluminum wheel ornaments . 442
Aluminum wheels ................. 442
Exterior ................................. 442
Interior .................................. 445
Radar sensor........................ 226
Seat belts ............................. 445
Clock ......................................... 91
Coat hooks .............................. 426
Condenser .............................. 461
Console box ............................ 415
Console box light ................... 410
Consumption screen.............. 106
Coolant .................................... 460 Checking .............................. 460
Cooling system ...................... 460 Engine overheating .............. 535
Coussins gonflables Modification et é limination en fin
de vie des coussins gonflables ........................................... 583
Crawl Control .......................... 365
Cruise control Dynamic radar cruise control with full-speed range .......... 256
Cup holders ............................ 414
Current fuel consumption ....... 97
Curtain shield airbags ............. 36
Customizable features ........... 561D
DAC ..........................................372
Daytime running light system211
Daytime running lights Replacing light bulbs ............490
Deck divider ............................417
Defogger Outside rear view mirrors .....401
Rear window.........................401
Windshield ............................401
Differential ...............................546
Digital Rear-view Mirror .........146
Dimension ...............................540
Dinghy towing .........................194
Display Dynamic radar cruise control with full-speed range ..........256
Head-up display ...................102
Intuitive parking assist ..........274
LTA (Lane Tracing Assist) .....248
Multi-information display.........95
Warning messages ............... 511
Display change button .............93
Distance until next engine oil change .....................................93
Do-it-yourself maintenance ...449
Door courtesy lights...............410
Door lock Side doors ............................ 113
Smart key system .................128
Wireless remote control........ 111
Doors Automatic door locking and unlocking system ................ 116
Door glasses ........................160
Door lock .............................. 113
Open door warning buzzer . 114, 11 6
Outside rear view mirrors .....155
Rear door child-protectors .... 116
Side doors ............................ 113