2023 TOYOTA SIENNA HYBRID engine coolant

5097-2. Steps to take in an emergency
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 and radia-
tor core (radiator) for any
leaks.
Radiator
Cooling fan
If a large amount of coolant leaks,
immediately contact your Toyota
dealer.
4The coolant level is satisfac-
tory if it is between the
“FULL” and “LOW” lines on
the reservoir.
Reservoir
“FULL” line
If your vehicle over-
heats
The following may indicate
that your vehicle is over-
heating.
The needle of the engine
coolant temperature gauge
( P.97, 101) enters the red
zone, or a loss of hybrid
system power is experi-
enced. (For example, the
vehicle speed does not
increase.)
 “Engine Coolant Temp High
Stop in a Safe Place See
Owner’s Manual” or “Hybrid
System Overheated Output
Power Reduced” is shown
on the multi-information dis-
play.
Steam comes out from
under the hood.
Correction procedures
A
B
A
B

5107-2. Steps to take in an emergency
“LOW” line
5 Add coolant if necessary.
Water can be us ed in an emer-
gency if engine coolant is unavail-
able.
6 Start the hybrid system and
turn the air conditioning sys-
tem on to check that the radi-
ator cooling fan operates and
to check for coolant leaks
from the radiator or hoses.
The fan operates when the air con-
ditioning system is turned on imme-
diately after a cold start. Confirm
that the fan is op erating by check-
ing the fan sound and air flow. If it is
difficult to check th ese, turn the air
conditioning system on and off
repeatedly. (The f an may not oper-
ate in freezing temperatures.)
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 inspected at the
nearest Toyota dealer.
■If “Hybrid System Over-
heated Output Power
Reduced” is shown on the
multi-information display
1 Stop the vehicle in a safe
place.
2 Stop the hybrid system and
carefully lift the hood.
3 After the hybrid system has
cooled down, inspect the
hoses and radiator core (radi-
ator) for any leaks.
Radiator
Cooling fan
If a large amount of coolant leaks,
immediately contact your Toyota
dealer.
4The coolant level is satisfac-
tory if it is between the
C
A
B

5117-2. Steps to take in an emergency
7
When trouble arises
“FULL” and “LOW” lines on
the reservoir.
Reservoir
“FULL” line
“LOW” line
5 Add coolant if necessary.
Water can be used in an emer-
gency if power control unit coolant
is unavailable.
6After stopping the hybrid sys-
tem and waiting for 5 minutes
or more, start the hybrid sys-
tem again and check for the
multi-information display.
If the message does not disappear:
Stop the hybrid system and contact
your Toyota dealer.
If the message is not displayed:
The hybrid system temperature has
dropped and the vehicle may be
driven normally.
However, if the message appears
again frequently, contact your Toyota dealer.
A
B
C
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 oper-
ating, the gasoline engine may
automatically start, or the cool-
ing 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 cap while the hybrid system
and radiator are hot.
High temperature steam or
coolant could spray out.
NOTICE
■When adding engine/power
control unit 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.

5208-1. Specifications
Outside temperature
Oil viscosity (0W-16 is explained
here as an example):
• The 0W in 0W-16 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 16 in 0W-16 indicates the viscosity characteristic of the
oil when the oil is at high tem-
perature. An oil with a higher
viscosity (one with a higher
value) may be better suited if the vehicle is operated at high
speeds, or under extreme
load conditions.
How to read oil container label:
API registered mark is added to
some oil containers to help you
select the oil you should use.
*: The coolant capacity is the quantity of reference.
If replacement is ne cessary, contact your Toyota dealer.
A
Cooling system
Capacity*Gasoline engine11.4 qt. (10.8 L, 9.5 Imp. qt.)
Power control unit2.0 qt. (1.9 L, 1.7 Imp. qt.)
Coolant type
Use either of the following:
“Toyota Super Long Life Coolant”
 Similar high-quality ethylene gly-
col-based non-silicate, non-amine,
non-nitrite, and non-borate cool-
ant with long-life hybrid organic
acid technology
Do not use plain water alone.
Ignition system (spark plug)
MakeDENSO FC16HR-Q8
Gap0.031 in. (0.8 mm)

5328-1. Specifications
■Temperature A, B, C
The temperature grades are A
(the highest), B, and C, repre-
senting the tire’s resistance to
the generation of heat and its
ability to dissipate heat when
tested under controlled condi-
tions on a specified indoor labo-
ratory test wheel.
Sustained high temperature can
cause the material of the tire to
degenerate and reduce tire life, and
excessive temperature can lead to
sudden tire failure.
Grade C corresponds to a level of performance which all passenger
car tires must meet under the Fed-
eral Motor Vehicle Safety Standard
No. 109.
Grades B and A represent higher
levels of performance on the labo-
ratory test wheel than the minimum
required by law.
Warning: The temperature grades
of a tire assume tha
t it is properly
inflated and not overloaded.
Excessive speed, underinflation, or
excessive loading, either sepa-
rately or in combination, can cause
heat buildup and possible tire fail-
ure.
Glossary of tire terminology
Tire related termMeaning
Cold tire inflation pres-
sureTire 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 pres-
sureThe maximum cold inflated pressure to which a
tire may be inflated, shown on the sidewall of
the tire
Recommended inflation
pressureCold tire inflation pressure recommended by a
manufacturer
Accessory weight
The combined weight (in excess of those stan-
dard items which may be replaced) of transmis-
sion, power steering, power brakes, power
windows, power seats, radio and heater, to the
extent that these items are available as factory-
installed equipment (whether installed or not)
Curb weight
The weight of a motor vehicle with standard
equipment, including th e maximum capacity of
fuel, oil and coolant, and if so equipped, air con-
ditioning and additional weight optional engine

572Alphabetical Index
Memory recall function ......... 181
Power easy access system .. 179
Driving support system informa- tion display ........................... 110
Dynamic radar cruise control with full-speed rangeFunction ............................... 291
Warning message ................ 475
E
ECB (Electronically Controlled Brake System) ...................... 335
Eco drive mode ...................... 334
EDR (Event data recorder)......... 8
E-Four (Electronic On-Demand AWD system) ........................ 336
Elapsed time ........................... 111
Electric motor Location.................................. 79
Specification ......................... 518
Electric Power Steering (EPS) Function ............................... 336
Warning light ........................ 466
Electronically Controlled Brake System (ECB) ....................... 335
Electronic key Battery-saving function......... 166
If the electronic key does not operate properly ................. 502
Replacing the battery ........... 444
Emergency, in case of If a warning buzzer sounds .. 464
If a warning light turns on ..... 464
If a warning message is dis-played................................. 475
If the 12-volt battery is dis- charged .............................. 504
If the electronic key does not operate properly ................. 502
If the fuel filler door cannot be opened ............................... 501
If the hybrid sy stem will not start ...........................................499
If the vehicle is submerged or water on the road is rising ..458
If you have a flat tire .....480, 490
If you lose your keys.............500
If you think something is wrong ...........................................463
If your vehicle becomes stuck ...........................................512
If your vehicle has to be stopped in an emergency .................457
If your vehicle needs to be towed ...........................................460
If your vehicle ove rheats ......509
Emergency flashers ...............456
Energy monitor .......................122
Engine Compartment........................413
Hood .....................................410
Identification number ............518
Engine coolant Capacity ...............................520
Checking ..............................416
Preparing and checking before winter ..................................344
Warning light ........................465
Engine coolant temperature gauge ...............................97, 101
Engine oil Capacity ...............................519
Checking ..............................413
Preparing and checking before winter ..................................344
Warning light ........................465
Engine oil maintenance data .415
Enhanced Vehicle Stability Con- trol (Enhanced VSC ) .............336
Enhanced VSC (Enhanced Vehi- cle Stability Control).............336
EPS (Electric Po wer Steering)
Function................................336
Warning light ........................466

Alphabetical Index581
Tire inflation pressure display function............................... 424
Tire pressure warning system ........................................... 424
Uniform Tire Quality Grading 531
Warning light ........................ 470
Tools .............. .................. 481, 490
Top tether strap ... ..................... 71
Total load capacity ......... 217, 220
Towing Dinghy towing....................... 232
Towing eyelet ....................... 490
Trailer sway control .............. 336
Trailer towing................ 221, 222
Toyota Safety Sense .............. 265 AHB (Automatic High Beam) 253
Dynamic radar cruise control with full-speed range .......... 291
LTA (Lane Tracing Assist).... 278
PCS (Pre-Collision System) . 270
RSA (Road Sign Assist) ....... 288
TRAC (Traction Control) ........ 336
Traction battery (Hybrid battery) ................................................. 83Hybrid battery (traction battery) air intake vents ..................... 85
Location.................................. 83
Specification ......................... 518
Warning messages ................ 86
Traction Control (TRAC) ........ 336
Traction motor (e lectric motor)79
Trailer sway control ............... 336
Trailer towing .................. 221, 222
Transmission Driving mode select switch... 334
Hybrid transmission.............. 241
Trip meters ....... ................. 97, 101
Turn signal lights Replacing light bulbs ............ 448
Turn signal lever................... 245U
USB charging ports ................379
V
Vanity lightsVanity lights ..........................374
Wattage ................................524
Vanity mirrors .........................374
Vehicle data recordings .............7
Vehicle identification number517
Vehicle Stability Control (VSC) ...............................................336
Ventilators (seat ventilators) .361
VSC (Vehicle Stab ility Control)
...............................................336
W
Warning buzzers Approach warning ................298
Brake hold ............................469
Brake Override System ........469
Brake system ........................464
Downshifting .........................244
Drive-Start Control ................469
Electric power steering .........466
High coolant temperature .....465
Hybrid system overheat ........465
Intuitive parking assist OFF indi- cator ...................................467
Intuitive parking assist ..........312
Low engine oil pressure .......465
LTA (Lane Traci ng Assist) ....278
LTA indicator ........................467
Open door ............................136
Open hood............................136
Open window........................203
PKSB OFF indicator .............468
Pre-collision warn ing ............270
RCD OFF indicator ...............468
RCTA (Rear Cross Traffic Alert)

582Alphabetical Index
........................................... 303
RCTA OFF indicator............. 468
Seat belt reminder ................ 471
Vehicle sway warning........... 282
Warning lights ABS ...................................... 466
Brake hold operated indicator........................................... 469
Brake Override System ........ 469
Brake system ....................... 464
Charging system .................. 464
Drive-Start Control ............... 469
Electric power steering ......... 466
Engine .................................. 465
High coolant temperature ..... 465
Hybrid system overheat ....... 465
Intuitive parking assist OFF indi- cator ................................... 467
Low engine oil pressure ....... 465
Low fuel level ....................... 470
LTA indicator ........................ 467
Malfunction indicator lamp ... 465
Parking brake indicator ........ 470
PCS warning light................. 467
PKSB (Parking Support Brake) ........................................... 469
PKSB OFF indicato r ............. 468
RCD OFF indicator............... 468
RCTA OFF indicator............. 468
Seat belt reminder light ........ 471
Slip indicator......................... 469
SRS ...................................... 466
Tire pressure ........................ 470
Warning messages ................ 475
Washer Checking .............................. 418
Low washer fluid warning mes-sage ........................... 418, 475
Preparing and c hecking before
winter.................................. 344
Switch........................... 257, 260
Washing and waxing .............. 396 Weights
Cargo capacity .............217, 220
Load limits ............................220
Wheels .....................................437 Replacing wheels .................437
Size ......................................523
Window glasses Power windows ....................202
Window lock switch ...............204
Windows Power windows ....................202
Rear window defogger .........350
Washer .........................257, 260
Windshield defogge r ..............349
Windshield wiper d e-icer .......353
Windshield wipers Intermittent windshield wipers...........................................257
Position.........................257, 260
Rain-sensing windshield wipers ...........................................257
Winter driving tips ..................344
Wireless charger.....................381
Wireless remote control.........130 Battery-saving function .........166
Locking/Unlocking ................130
Panic mode ..........................130
Replacing the battery ...........444
For vehicles with Entune Audio, Entune Audio Plus
or Entune Premium Audio,
refer to the “NAVIGA-
TION AND MULTIMEDIA
SYSTEM OWNER’S MAN-
UAL” for information
regarding the equipment
listed below.
· Navigation system