engine overheat TOYOTA COROLLA HYBRID 2021 Owners Manual (in English)

14Pictorial index
COROLLA HV_U
Fuel filler door ............................................... ..................... P.180
Refueling method ............................................... .................. P.181
Fuel type/fuel tan k capacity ................................... .............. P.525
Tires.......................................................... ........................... P.441
Tire size/inflation pressure ................................... ................ P.529
Winter tires/tire chains ....................................... .................. P.247
Checking/rotation/tire pressure warning system
*................. P.441
Coping with flat tires......................................... ............ P.490, 501
Hood ........................................................... ......................... P.432
Opening ............................................................................... P.432
Engine oil ..................................................... ........................ P.526
Coping with overheating ...................................................... P.517
Headlights/daytime running lights .............................. ..... P.173
Turn signal lights/parking lights .............................. ......... P.173
Parking lights
*............................................................... ..... P.173
Front side marker lights ....................................... ............. P.173
Stop lights/tail lights/rear side marker lights/turn signal lig hts
P. 1 7 3
License plate lights........................................... ................. P.173
Back-up lights
Shifting the shift position to R ............................... ............... P.164
*: If equipped
Light bulbs of the exterior lights for driving
(Replacing method: P.463, Watts: P.530)

952-1. Instrument cluster
COROLLA HV_U
2
Vehicle status information and indicators
vehicle’s systems.
*1: These lights come on when the power switch is turned to ON to
indicate that a system check is
being performed. They will turn
off after the hybrid system is
started, or after a few seconds.
(U.S.A.)
Brake system warning
light
*1 (  P.478)
(Red)
(Canada)
Brake system warning
light
*1 (  P.478)
(Yellow)
Brake system warning
light
*1 ( P.478)
High coolant temperature
warning light
*2 (  P.478)
Hybrid system overheat
warning light
*2 (  P.479)
Charging system warning
light
*1 (  P.479)
Low engine oil pressure
warning light
*2 (  P.479)
(U.S.A.)
Malfunction indicator
lamp
*1 ( P.479)
(Canada)
Malfunction indicator
lamp
*1 ( P.479)
SRS warning light
*1
(  P.480)
(U.S.A.)
ABS warning light*1
(  P.480)
(Canada)
ABS warning light*1
(  P.480)
Brake Override System
warning light/Drive-Start
Control warning light
*2
(  P.480)
(Red)
Electric power steering
system warning light
*1
(  P.481)
(Yellow)
Electric power steering
system warning light
*1
(  P.481)
Low fuel level warning
light ( P.481)
Driver’s and front passen-
ger’s seat belt reminder
light ( P.481)
Rear passengers’
seat belt reminder
lights ( P.482)
Tire pressure warning
light
*1 (if equipped)
(  P.482)
(Orange)
LTA indicator ( P.482)
(Flashes)
RCTA OFF indicator*1 (if
equipped) ( P.483)
(Flashes
or illumi- nates)PCS warning light*1
(  P.483)
Slip indicator
*1 (  P.483)
(Flashes)
(U.S.A.)
Parking brake indicator
(  P.484)
(Flashes)
(Canada)
Parking brake indicator
( P.484)
(Flashes)
Brake hold operated indi-
cator
*1( P.484)

1002-1. Instrument cluster
COROLLA HV_Uspeed that is displayed may differ
even when vehicle operation and
driving conditions are the same.
■Outside temperature display
●In the following si
tuations, the cor-
rect outside tempe rature may not
be displayed, or the display may
take longer than normal to
change:
• When stopped, or driving at low speeds (less than 16 mph [25
km/h])
• When the outside temperature has changed su ddenly (at the
entrance/exit of a garage, tunnel,
etc.)
●When “--” or “E” is displayed, the
system may be malfunctioning.
Take your vehicle to your Toyota
dealer.
■Liquid crystal display
 P. 1 0 3
■Customization
The gauges and met ers can be cus-
tomized in of the multi-informa-
tion display. ( P.108)
■Changing the display
Press the display change button
until the desired item is dis-
played.
■Display items
 Odometer
Displays the total distance the vehi-
cle has been driven.
 Trip meter A/Trip meter B
Displays the distance the vehicle
has been driven since the meter
was last reset. Trip meters A and B
can be used to record and display
WA R N I N G
■The information display at
low temperatures
Allow the interior of the vehicle to
warm up before u sing the liquid
crystal informat ion display. At
extremely low temperatures, the
information display monitor may
respond slowly, and display
changes may be delayed.
For example, there is a lag
between the driver’s shifting and
the new gear number appearing
on the display. This lag could
cause the driver to downshift
again, causing rapid and exces-
sive engine braking and possibly
an accident resulting in death or
injury.
NOTICE
■To prevent damage to the
engine and its components
●Do not let the indicator needle
of the tachometer enter the red
zone, which indicates the maxi-
mum engine speed.
●The engine may be overheating
if the engine coolant tempera-
ture gauge is in the red zone
(H). In this case, immediately
stop the vehicle in a safe place,
and check the engine after it
has cooled completely.
(  P.517)
Odometer and trip meter
display

1504-1. Before driving
COROLLA HV_U
WA R N I N G
●In order to prevent accidents
due to the vehicle rolling away,
always keep depressing the
brake pedal while stopped with
the “READY” indicator is illumi-
nated, and appl y the parking
brake as necessary.
●If the vehicle is stopped on an
incline, in order to prevent acci-
dents caused by the vehicle roll-
ing forward or backward, always
depress the brake pedal and
securely apply the parking
brake as needed.
●Avoid revving or racing the
engine.
Running the engine at high
speed while the vehicle is
stopped may cause the exhaust
system to overheat, which could
result in a fire if combustible
material is nearby.
■When the vehicle is parked
●Do not leave glasses, cigarette
lighters, spray cans, or soft
drink cans in the vehicle when it
is in the sun.
Doing so may result in the fol-
lowing:
• Gas may leak from a cigarette lighter or spray can, and may
lead to a fire.
• The temperature inside the vehicle may cause the plastic
lenses and plastic material of
glasses to deform or crack.
• Soft drink cans may fracture, causing the contents to spray
over the interior of the vehicle,
and may also caus e a short cir-
cuit in the vehicle’s electrical
components.
●Do not leave cigarette lighters in
the vehicle. If a cigarette lighter
is in a place such as the glove
box or on the floor, it may be lit
accidentally when luggage is
loaded or the se at is adjusted,
causing a fire.
●Do not attach adhesive discs to
the windshield or windows. Do
not place containers such as air
fresheners on the instrument
panel or dashboard. Adhesive
discs or containers may act as
lenses, causing a fire in the
vehicle.
●Do not leave a door or window
open if the curved glass is
coated with a metallized film
such as a silver-colored one.
Reflected sunlight may cause
the glass to act a s a lens, caus-
ing a fire.
●Always apply the parking brake,
shift the shift lever to P, stop the
hybrid system and lock the vehi-
cle.
Do not leave the vehicle unat-
tended while the “READY” indi-
cator is illuminated.
If the vehicle is parked with the
shift lever in P but the parking
brake is not set, the vehicle may
start to move, possibly leading
to an accident.
●Do not touch the exhaust pipes
while the “READY” indicator is
illuminated or immediately after
turning the hybr id system off.
Doing so may cause burns.

2424-5. Using the driving support systems
COROLLA HV_U
●The vehicle is stopped
●The accelerator pedal is not
depressed
●The parking brake is not engaged
■Automatic system cancelation
of hill-start assist control
The hill-start assis t control will turn
off in any of the following situations:
●The shift lever is shifted to P or N.
●The accelerator pedal is
depressed
●The parking brake is engaged
●2 seconds at maximum elapsed
after the brake pedal is released
■Sounds and vibrations caused
by the ABS, brake assist, VSC,
TRAC and hill-start assist con-
trol systems
●A sound may be heard from the
engine compartment when the
brake pedal is dep ressed repeat-
edly, when the hybrid system is
started or just after the vehicle
begins to move. This sound does
not indicate that a malfunction has
occurred in any of these systems.
●Any of the following conditions
may occur when t he above sys-
tems are operating.
None of these indicates that a
malfunction has occurred.
• Vibrations may be felt through the
vehicle body and steering.
• A motor sound may be heard also after the vehicle comes to a stop.
■ECB operating sound
ECB operating sound may be heard
in the following cases, but it does
not indicate that a malfunction has
occurred.
●Operating sound heard from the
engine compartment when the
brake pedal is operated.
●Motor sound of the brake system
heard from the front part of the
vehicle when the driver’s door is
opened.
●Operating sound heard from the
engine compartment when one or
two minutes passed after the stop
of the hybrid system.
■Active Cornering Assist opera-
tion sounds and vibrations
When the Active Cornering Assist is
operated, operation sounds and
vibrations may be generated from
the brake system, but this is not a
malfunction.
■EPS operation sound
When the steering wheel is oper-
ated, a motor sound (whirring
sound) may be heard. This does not
indicate a malfunction.
■Automatic reactivation of TRAC
and VSC systems
After turning th e TRAC and VSC
systems off, the systems will be
automatically re-enabled in the fol-
lowing situations:
●When the power switch is turned
off
●If only the TRAC sy stem is turned
off, the TRAC will turn on when
vehicle speed increases
If both the TRAC and VSC sys-
tems are turned o ff, automatic
re-enabling will not occur when
vehicle speed increases.
■Operating conditions of Active
Cornering Assist
The system operates when the fol-
lowing occurs.
●TRAC/VSC can operate
●The driver is attempting to accel-
erate while turning
●The system detects that the vehi-
cle is drifting to the outer side
●The brake pedal is released
■Reduced effectiveness of the
EPS system
The effectiveness of the EPS sys-
tem is reduced to prevent the sys-
tem from overheating when there is
frequent steering input over an

4798-2. Steps to take in an emergency
COROLLA HV_U
8
When trouble arises
■Hybrid system overheat warning light* (warning buzzer)
*: This light illuminat es on the multi-information display.
■Charging system warning light
■Low engine oil pressure warning light* (warning buzzer)
*: This light illuminates on the multi-information display.
■Malfunction indicator lamp (warning buzzer)
Warning lightDetails/Actions
Indicates that the temperature of the hybrid system is
excessively high
Stop the vehicle in a safe place.
Handling method ( P.517)
Warning lightDetails/Actions
Indicates a malfunction in the vehicle’s charging system
 Immediately stop the vehicle in a safe place and con-
tact your Toyota dealer.
Warning lightDetails/Actions
Indicates that the engine oil pressure is excessively low
 Immediately stop the vehicle in a safe place and con-
tact your Toyota dealer.
Warning lightDetails/Actions
(U.S.A.)
or
(Canada)
Indicates a malfunction in:
The hybrid system;
 The electronic engine control system; or
 The electronic thrott le control system
 Immediately stop the vehicle in a safe place and con-
tact your Toyota dealer.

4888-2. Steps to take in an emergency
COROLLA HV_Uthe level of the engine oil, and add if
necessary.
This message may appear if the
vehicle is stopped on a slope. Move
the vehicle to a level surface and
check to see 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 th an usual.
■If “Hybrid System Overheated
Output Power Reduced” is dis-
played
This message may be displayed
when driving under severe operat-
ing conditions. (For example, when
driving up a long steep hill.)
Handling method: P. 5 1 7
■If “Traction Battery Needs to be
Protected Refrain from the Use
of N Position” is displayed
This message may be displayed
when the shift lever is in N.
As the hybrid batte ry (traction bat-
tery) cannot 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 displayed
This message is displayed when the
hybrid battery (traction battery)
charge has become 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 is in N Release Acceler-
ator Before Shif ting” is dis-
played
The accelerator pedal has been depressed when the shift lever is in
N.
Release the accelerator pedal and
shift the shift
lever to D or R.
■If “Press Brake when Vehicle is
Stopped Hybrid System may
Overheat” is displayed
The message may be displayed
when the accelerator pedal is
depressed to hold the vehicle while
the vehicle is stopped on an incline,
etc. The hybrid system may over-
heat. Release the accelerator pedal
and depress the brake pedal.
■If “Auto Power OFF to Conserve
Battery” is displayed
Power was cut off due to the auto-
matic power off function. Next time
when starting the hybrid system,
operate the hybrid system for
approximately 5 minutes to
recharge the 12-volt battery.
■If “Headlight System Malfunc-
tion Visit Your Dealer” is dis-
played
The following systems may be mal-
functioning. Hav e the vehicle
inspected by your Toyota dealer
immediately.
●The LED headlight system
●Automatic High Beam
■If a message that indicates the
malfunction of front camera is
displayed
The following systems may be sus-
pended until the problem shown in
the message is resolved. (P.187,
478)
●PCS (Pre-Collision system)
●LTA (Lane Tracing Assist)
●Automatic High Beam
●RSA (Road Sign Assist) (if
equipped)
●Dynamic radar cruise control with
full-speed range

5178-2. Steps to take in an emergency
COROLLA HV_U
8
When trouble arises
If the engine coolant tempera-
ture gauge enters the red
zone or “Engine Coolant
Temp High Stop in a Safe
Place See Owner’s Manual”
is shown on the multi-informa-
tion 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 sub-
NOTICE
■When handling jumper cables
When connecting the jumper
cables, ensure that they do not
become entangled in the cooling
fans, etc.
If your vehicle over-
heats
The following may indicate
that your vehicle is over-
heating.
 The engine coolant tem-
perature gauge ( P. 9 8 ) i s
in the red zone or a loss of
hybrid system power is
experienced. (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

569Alphabetical Index
COROLLA HV_U
Heated steering wheel and seat
heater precautions ............. 393
How your child should wear the seat belt................................ 28
Power window lock switch.... 144
Power window precautions .. 143
Rear door child-protectors.... 122
Removed electronic key battery precautions......................... 460
Seat belt extender precautions ............................................. 28
Seat belt precautions ............. 47
Trunk precautions................. 123
Child-protectors ..................... 122
Cleaning Exterior ................................. 420
Interior .................................. 422
Radar sensor........................ 184
Seat belts ............................. 422
Wheels and wheel ornaments........................................... 420
Clock ......................... 98, 101, 292
Coat hooks .............................. 410
Command list ......................... 337
Condenser .............................. 437
Console box ............................ 399
Cooling system ...................... 436 Engine overheating .............. 517
Hybrid system overheating... 518
Cruise control Dynamic radar cruise control with full-speed range .......... 207
Cup holders ............................ 398
Current fuel consumption ..... 104
Curtain shield airbags ............. 31
Customizable features ........... 544
D
Daytime running light system173
DCM ................................. 376, 377
Defogger Outside rear view mirrors ..... 387 Rear window.........................387
Windshield ............................387
Dimensions .............................524
Dinghy towing .........................156
Display Dynamic radar cruise control with full-speed range ..........207
Energy monitor .....................109
LTA (Lane Tracing Assist) .....202
Multi-information display.......103
RCTA ....................................226
Warning message.................487
Display change button ...........100
Do-it-yourself maintenance ...426
Door lock Doors .................................... 119
Smart key system .................125
Wireless remote control........ 117
Doors Automatic door locking and unlocking system ................122
Door glasses ........................142
Door lock .............................. 119
Open door warning buzzer .120, 122
Outside rear view mirrors .....140
Rear door child-protectors ....122
Side doors ............................ 119
Drive distance .........................107
Drive information ....................107
Drive-start control ..................147
Driving Break-in tips .........................147
Correct driving posture ...........25
Driving mode select switch ...239
Hybrid vehicle dri ving tips .....245
Procedures ...........................146
Winter drive tips....................247
Driving informatio n display ...104
Driving range ..........................104
Driving support system informa- tion display............................107

570Alphabetical Index
COROLLA HV_U
Dynamic radar cruise control with full-speed range ........... 207Warning message ................ 216
E
ECB (Electronically Controlled Brake System) ...................... 240
ECO Accelerator Guidance ... 105
Eco score ................................ 105
EDR (Event data recorder)......... 8
Elapsed time ........................... 107
Electric motor (traction motor)80
Electric Power Steering (EPS) ............................................... 240Warning light ........................ 481
Electronic key ......................... 116 Battery-saving function......... 126
If the electronic key does not operate properly ................. 511
Replacing the battery ........... 459
Electronically Controlled Brake System (ECB) ....................... 240
Emergency flashers ............... 470
Emergency tire puncture repair kit ........................................... 490
Emergency, in case of If a warning buzzer sounds .. 478
If a warning light turns on ..... 478
If a warning message is dis-played................................. 487
If the 12-volt battery is dis- charged .............................. 513
If the electronic key does not operate properly ................. 511
If the fuel filler door cannot be opened ............................... 511
If the hybrid sy stem will not start
........................................... 509
If the vehicle is trapped in rising water .................................. 472
If you have a fla t tire ..... 490, 501
If you lose your keys ............ 510 If you think something is wrong
...........................................476
If your vehicle becomes stuck ...........................................520
If your vehicle has to be stopped in an emergency .................471
If your vehicle needs to be towed ...........................................473
If your vehicle ove rheats ......517
Energy monitor .......................109
Engine ACCESSORY mode . ............160
Compartment........................434
Engine switch .......................157
Hood .....................................432
How to start the hybrid system ...........................................157
Identification number ............525
If the hybrid sys tem will not start
...........................................509
If your vehicle has to be stopped in an emergency .................471
Ignition switch (power switch) ...........................................157
Overheating ..........................517
Power switch ........................157
Tachometer.............................98
Engine coolant Capacity ...............................527
Checking ..............................436
Preparing and checking before winter ..................................247
Engine coolant temperature gauge .......................................98
Engine oil Capacity ...............................526
Checking ..............................434
Preparing and checking before winter ..................................247
Warning light.........................479