2021 TOYOTA SIENNA HYBRID oil pressure

4406-3. Do-it-yourself maintenance
When replacing wheels, care
should be taken to ensure that
they are equivalent to those
removed in load capacity, diam-
eter, rim width and inset
*.
Replacement wheels are avail-
able at your Toyota dealer.
*: Conventionally referred to as off- set.
Toyota does not recommend
using the following:
 Wheels of different sizes or
types
 Used wheels
 Bent wheels that have been
straightened
■When replacing wheels
The wheels of your vehicle are
equipped with tire pressure warning
valves and transmitters that allow
the tire pressure warning system to
provide advance warning in the
event of a loss in tire inflation pres-
sure. Whenever wheels are
replaced, tire pressure warning
valves and transmitters must be
installed. ( P.427, 441)
Wheels
If a wheel is bent, cracked or
heavily corroded, it should
be replaced. Otherwise, the
tire may separate from the
wheel or cause a loss of
handling control.
Wheel selection
WARNING
■When replacing wheels
●Do not use wheels that are a dif-
ferent size from those recom-
mended in the Owner’s Manual,
as this may result in a loss of
handling control.
●Never use an inner tube in a
leaking wheel which is designed
for a tubeless tire. Doing so may
result in an accident, causing
death or serious injury.
■When installing the wheel
nuts
Never use oil or grease on the
wheel bolts or wheel nuts. Oil and
grease may cause the wheel nuts
to be excessively tightened, lead-
ing to bolt or disc wheel damage.
In addition, the oil or grease can
cause the wheel nuts to loosen
and the wheel may fall off, caus-
ing an accident and resulting in
death or serious injury. Remove
any oil or grease from the wheel
bolts or wheel nuts.
■Use of defective wheels pro-
hibited
Do not use cracke d or deformed
wheels.
Doing so could cause the tire to
leak air during driving, possibly
causing an accident.

4677-2. Steps to take in an emergency
7
When trouble arises
■High coolant temperature warning light* (warning buzzer)
*: This light illuminates on the mu lti-information display with a message.
■Hybrid system overheat warning light* (warning buzzer)
*: This light illuminates on the mu lti-information display with a message.
■Low engine oil pressure warning light* (warning buzzer)
*: This light illuminates on the mu lti-information display with a message.
■Malfunction indicator lamp
Warning lightDetails/Actions
Indicates that the engine coolant temperature is too
high
 Immediately stop the v ehicle in a safe place.
Handling method ( P.511)
Warning lightDetails/Actions
Indicates that the hybri d system has overheated
 Stop the vehicle in a safe place.
Handling method ( P.511)
Warning lightDetails/Actions
Indicates that the engine oil pressure is too low
 Immediately stop the vehicle in a safe place and
contact your Toyota dealer.
Warning lightDetails/Actions
(U.S.A.)
(Canada)
Indicates a malfunction in:
 The hybrid system;
 The electronic engi ne control system;
 The electronic throttle control system; or
 The emission control system (if equipped)
 Have the vehicle insp ected by your Toyota
dealer immediately.

4797-2. Steps to take in an emergency
7
When trouble arises
tion display, it may indicate a mal-
function. Immediately stop the
vehicle and contact your Toyota
dealer.
•“Braking Power Low”
• “12-Volt Battery Charging System
Malfunction”
• “Oil Pressure Low”
●If any of the following messages
are shown on the multi-informa-
tion display, the vehicle may have
run out of fuel. Stop the vehicle in
a safe place and, if the fuel level is
low, refuel the vehicle.
• “Hybrid System Stopped”
• “Engine Stopped”
●If “Low Auxiliary Battery See
Owner’s Manual” is shown
• When the display goes off after
several seconds
*:
Maintain the hybri d system opera-
tion for more than 15 minutes and
charge the 12- volt battery.
• When the display does not go off:
Start up the hybrid system using the
procedures for “If the 12-volt battery
is discharged” ( P.506)
*: Displays for about 6 seconds
●If “Maintenance Required for Trac-
tion Battery Cooling Parts See
Owner’s Manual” is shown, the fil-
ter may be clogged, the air intake
vent may be blocked, or there may
be a gap in the duct. Therefore,
perform the following correction
procedure.
• If the air intake vent or filter of the hybrid battery (traction battery)
are dirty, perform the procedures
on P.443to clean them.
• If the warning message is shown when the air intake vent and filter
of the hybrid battery (traction bat-
tery) are not dirty, have the vehicle
inspected at your Toyota dealer.
■If “Engine Oil Level Low Add or
Replace” is displayed
The engine oil level may be low.
Check the level of the engine oil, and add engine oil if necessary.
This message may be displayed if
the vehicle is stopped on a slope.
Move the vehicle to a level surface
and check if the message disap-
pears.
■If “Hybrid System Stopped
Steering Power Low” is dis-
played
This message is displayed if the
hybrid system is stopped while driv-
ing.
When steering wheel operations are
heavier than usual, grip the steering
wheel firmly and operate it using
more force than usual.
■If “Hybrid System Overheated
Output Power Reduced” is
shown
The message may be shown when
driving under severe operating con-
ditions. (For example, when driving
up a long steep hill or driving up a
steep hill in reverse.)
Coping method: P.514
■If “Traction Battery Needs to be
Protected Refrain from the Use
of N Position” is shown
This message may be displayed
when the shift lever is in N.
As the hybrid battery (traction bat-
tery) can not be charged when the
shift lever is in N, shift the shift lever
to P when the vehicle is stopped.
■If “Traction Battery Needs to be
Protected Shift into P to
Restart” is shown
This message is displayed when the
hybrid battery (traction battery)
charge has becom e extremely low
because the shift lever has been left
in N for a certain amount of time.
When operating the vehicle, shift to
P and restart the hybrid system.
■If “Shift to P Before Exiting
Vehicle” is shown
Message is displayed when the
driver’s door is opened without turn-

5348-1. 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

5548-3. Initialization
8-3.Initialization
Items to initialize
The following items must be initialized for normal system
operation after such cases as the battery being reconnected,
or maintenance being performed on the vehicle:
List of the items to initialize
ItemWhen to initializeReference
Oil maintenanceAfter the maintenance is per-
formedP.418
Tire pressure warning system
• When rotating the tires
• When changing the tire
• After registering the ID codes
P.430

576Alphabetical Index
Heated steering wheel ........... 361
HeatersFront automatic air conditioning system ................................ 348
Heated steering wheel ......... 361
Outside rear view mirrors ..... 350
Rear automatic air conditioning system ................................ 358
Seat heaters ......................... 361
High mounted stoplight Replacing light bulbs ............ 451
Hill-start assist control .......... 335
Hood ........................................ 413
Hooks Cargo hooks ......................... 372
Coat hooks ........................... 388
Grocery bag hooks ............... 387
Retaining hooks (floor mat) .... 32
Horn ......................................... 186
Hybrid battery (tr action battery)
Location.................................. 83
Specification ......................... 521
Hybrid battery (traction battery) air intake vents ............... 85, 443
Hybrid battery (traction battery) air intake vents and filters ... 443
Hybrid battery air vent ............. 85
Hybrid system .......................... 79 ACC...................................... 234
Acoustic Vehicle Alerting System............................................. 81
Emergency shut off system .... 86
Energy monitor/consumption screen ................................ 122
EV drive mode...................... 236
High voltage components....... 83
How to start the hybrid system ........................................... 231
Hybrid battery (traction battery) air vents.............................. 443
Hybrid System In dicator . 97, 101
Hybrid system precautions ..... 83 Hybrid vehicle dri
ving tips .....341
If the hybrid sys tem will not start
...........................................501
If your vehicle has to be stopped in an emergency .................459
Ignition switch (power switch) ...........................................231
Overheating ..........................511
Power (ignition) switch .........231
Regenerative braking .............80
Starting the hybrid system ....231
Hybrid System Indicator ..................98, 102, 121
Hybrid transmissio n ...............238
S mode .................................241
I
I/M test .....................................410
Identification Engine ..................................520
Vehicle..................................519
Ignition switch (power switch) ...............................................231Auto power off fun ction.........235
Changing the power switch modes.................................234
If your vehicle has to be stopped in an emergency .................459
Starting the hybrid system ....231
Immobilizer system ..................88
Indicators ..................................95
Initialization Items to initialize ...................554
Oil maintenance ...................418
Tire pressure warning system...........................................430
Inside rear view m irror ...186, 188
Instrument panel light control .............................99, 103
Interior lights...........................363 Switch ...................................364
Wattage ................................526

578Alphabetical Index
MeterClock ............................ 100, 104
Indicators................................ 95
Instrument panel light control .......................... 99, 103
Meter control switches ......... 105
Meters ............................ 97, 101
Multi-information display ...... 104
Settings ........................ 112, 541
Units ............................. 115, 541
Warning lights ................ 93, 466
Warning messages .............. 477
Meter control switches .......... 105
Mirrors Digital Rear-view Mirror........ 188
Inside rear view mirror.......... 186
Outside rear view mirror defog-gers .................................... 350
Outside rear view mirrors ..... 198
Vanity mirrors ....................... 374
Moon roof Door lock linked moon roof oper-ation ................................... 204
Jam protection function ........ 204
Operation ............................. 204
Warning message ................ 205
Multi-information display Audio system-linked display . 111
Changing the display............ 105
Display contents ................... 104
Driving information display ... 106
Driving support system informa-tion display ......................... 110
Dynamic radar cruise control with full-speed range .......... 288
Energy monitor ..................... 122
Hybrid System In dicator . 98, 102
Intuitive parking assist-sensor ........................................... 308
Language ..................... 115, 541
LTA (Lane Tracing Assist).... 281
Menu icons ........................... 106 Meter control switches..........105
PCS (Pre-Collisio
n System) .267
Pop-up display......................115
Settings ........................112, 541
Suggestion function ......117, 541
Tire pressure ...... ..................427
Units .............................115, 541
Vehicle information display...111
Warning messages ...............477
N
Navigation system-linked display
...............................................118
Noise from under ve hicle...........6
Normal mode...........................333
O
Odometer...........................97, 101
Odometer and trip meter display “ODO TRIP” switch .........99, 103
“ODO TRIP”switch ...........99, 103
Oil Engine oil..............................521
Opener Back door .....................152, 154
Hood .....................................413
Outer foot lights Replacing light bulbs ............451
Outside rear view mirrors ......198 Adjusting and folding ............198
BSM (Blind Spot M onitor) .....300
Linked mirror function when reversing.............................199
Outside rear view mirror defog- gers ....................................350
Outside temperature display .............................98, 102
Overheating.............................511

Alphabetical Index583
Snow tires ............................ 343
Spare tire.............................. 491
Tire identification number ..... 531
Tire inflation pressure display function............................... 427
Tire pressure warning system ........................................... 427
Uniform Tire Quality Grading 533
Warning light ........................ 472
Tools .............. .................. 483, 492
Top tether strap ... ..................... 71
Total load capacity ......... 215, 218
Towing Dinghy towing....................... 230
Towing eyelet ............... 483, 492
Trailer sway control .............. 335
Trailer towing................ 219, 220
Toyota Safety Sense .............. 262 Automatic High Beam .......... 250
Dynamic radar cruise control with full-speed range .......... 288
LTA (Lane Tracing Assist).... 275
PCS (Pre-Collision System) . 267
RSA (Road Sign Assist) ....... 285
TRAC (Traction Control) ........ 335
Traction battery (Hybrid battery) ................................................. 83Hybrid battery (traction battery) air intake vents ..................... 85
Location.................................. 83
Specification ......................... 520
Warning messages ................ 86
Traction Control (TRAC) ........ 335
Traction motor (e lectric motor)79
Trailer sway control ............... 335
Trailer towing .................. 219, 220
Transmission Driving mode select switch... 333
Hybrid transmission.............. 238
Trip meters ....... ................. 97, 101
Turn signal lights Replacing light bulbs ............ 451 Turn signal lever .
..................242
U
USB charging ports ................379
V
Vacuum cleaner ......................389
Vanity lights
Vanity lights ..........................374
Wattage ................................526
Vanity mirrors .........................374
Vehicle data recordings .............7
Vehicle identification number519
Vehicle Stability Control (VSC) ...............................................335
Ventilators (seat ventilators) .361
VSC (Vehicle Stab ility Control)
...............................................335
W
Warning buzzers Approach warning ................295
Brake hold ............................471
Brake Override System ........471
Brake system ........................466
Downshifting .........................241
Drive-Start Control ................471
Electric power steering .........468
High coolant temperature .....467
Hybrid system overheat ........467
Intuitive parking assist OFF indi- cator ...................................469
Intuitive parking assist ..........308
Low engine oil pressure .......467
LTA (Lane Traci ng Assist) ....275
LTA indicator ........................469
Open door ............................136
Open hood............................136
Open window........................202
PKSB OFF indicator .............470