coolant temperature TOYOTA COROLLA HYBRID 2020 Owners Manual (in English)

812-1. 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.
There may be a malfunction in a
system if the lights do not come
on, or turn off. Have the vehicle
inspected by your Toyota dealer.
(U.S.A.)
Brake system warning
light
*1 (  P.450)
(Red)
(Canada)
Brake system warning
light
*1 (  P.450)
(Yellow)
Brake system warning
light
*1 ( P.450)
High coolant temperature
warning light
*2 (  P.450)
Hybrid system overheat
warning light
*2 (  P.451)
Charging system warning
light
*1 (  P.451)
Low engine oil pressure
warning light
*2 (  P.451)
(U.S.A.)
Malfunction indicator
lamp
*1 ( P.451)
(Canada)
Malfunction indicator
lamp
*1 ( P.451)
SRS warning light
*1
(  P.452)
(U.S.A.)
ABS warning light*1
(  P.452)
(Canada)
ABS warning light*1
(  P.452)
Brake Override System
warning light/Drive-Start
Control warning light
*2
(  P.452)
(Red)
Electric power steering
system warning light
*1
(  P.453)
(Yellow)
Electric power steering
system warning light
*1
(  P.453)
Low fuel level warning
light ( P.453)
Driver’s and front passen-
ger’s seat belt reminder
light ( P.453)
Rear passengers’
seat belt reminder
lights ( P.454)
Tire pressure warning
light
*1 (if equipped)
(  P.454)
(Orange)
LTA indicator ( P.454)
(Flashes
or illumi- nates)PCS warning light*1
(  P.455)
Slip indicator
*1 (  P.455)
(Flashes)
(U.S.A.)
Parking brake indicator
(  P.455)
(Flashes)
Parking brake indicator
( P.455)
(Flashes)
Brake hold operated indi-
cator
*1 ( P.456)

842-1. Instrument cluster
COROLLA HV_U
■Locations of gauges and meters
Analog speedometer
The units of measure may differ depending on the intended destination of
the vehicle.
Tachometer
Displays the engine speed in revolutions per minute
Speedometer
Clock ( P. 8 7 )
Fuel gauge
Displays the quantity of fu el remaining in the tank
Engine coolant temperature gauge
Displays the engine coolant temperature
Display change button ( P.86)
Odometer and trip meter display ( P.86)
Multi-information display
Presents the driver with a variety of vehicle data (P.89)
Displays warning messages if a malfunction occurs (P.459)
Outside temperature
Displays the outside temperature within the range of -40°F (-40 °C) to 122°F
(50°C)
Gauges and meters
Meter display

852-1. Instrument cluster
COROLLA HV_U
2
Vehicle status information and indicators
Shift position indicator ( P.149)
Digital speedometer
The units of measure may differ depending on the intended desti nation of
the vehicle.
Tachometer
Displays the engine speed in revolutions per minute
Speedometer
Clock ( P. 8 7 )
Fuel gauge
Displays the quantity of fu el remaining in the tank
Engine coolant temperature gauge
Displays the engine coolant temperature
Display change button ( P.86)
Odometer and trip meter display ( P.86)
Multi-information display
Presents the driver with a variety of vehicle data (P.89)
Displays warning messages if a malfunction occurs (P.459)
Outside temperature
Displays the outside temperature within the range of -40°F (-40 °C) to 122°F
(50°C)
Shift position indicator ( P.149)
■Engine speed
On hybrid vehicles, engine speed is precisely controlled in order to help
improve fuel efficiency and reduce
exhaust emissions etc.
There are times when the engine

862-1. 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. 8 9
■Customization
The gauges and met ers can be cus-
tomized in of the multi-informa-
tion display. ( P. 9 4 )
■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.489)
Odometer and trip meter
display

4037-3. Do-it-yourself maintenance
COROLLA HV_U
7
Maintenance and care
Light bulbs
(  P.435)
• Bulb with same
number and wattage
rating as original
• Flathead screw- driver
•Wrench
Radiator
and con-
denser
(  P.409)

Tire infla-
tion pres-
sure
( P.422)• Tire pressure gauge
• Compressed air
source
Washer
fluid
( P.412)
• Water or washer
fluid containing anti-
freeze (for winter
use)
• Funnel (used only for adding water or
washer fluid)
WA R N I N G
The engine compartment contains
many mechanisms and fluids that
may move suddenly, become hot,
or become electrically energized.
To avoid death or serious injury,
observe the following precautions.
■When working on the engine
compartment
●Make sure that the “ACCES-
SORY” or “IGNITION ON” on
the multi-inform ation display
and the “READY” indicator are
both off.
●Keep hands, clothing and tools
away from the moving fans.
ItemsParts and tools●Be careful not to touch the
engine, power control unit, radi-
ator, exhaust manifold, etc. right
after driving as they may be hot.
Oil and other fluids may also be
hot.
●Do not leave anything that may
burn easily, such as paper and
rags, in the engine compart-
ment.
●Do not smoke, c ause sparks or
expose an open flame to fuel or
the 12-volt battery. Fuel and
12-volt battery fumes are flam-
mable.
●Be extremely cautious when
working on the 12-volt battery. It
contains poisonous and corro-
sive sulfuric acid.
■When working near the elec-
tric cooling fans or radiator
grille
Be sure the power switch is OFF.
With the power switch in ON, the
electric cooling fans may auto-
matically start to r un if the air con-
ditioning is on an d/or the coolant
temperature is high. ( P.409)
■Safety glasses
Wear safety glasses to prevent
flying or falling material, fluid
spray, etc. from getting in your
eyes.
NOTICE
■If you remove the air cleaner
filter
Driving with the ai r cleaner filter
removed may cause excessive
engine wear due to dirt in the air.

4067-3. Do-it-yourself maintenance
COROLLA HV_U
Washer fluid tank ( P.412)
Engine coolant reservoir ( P.408)
Fuse boxes ( P.433)
Engine oil level dipstick ( P.407)
Engine oil filler cap ( P.407)
Power control unit coolant reservoir ( P.408)
Brake fluid reservoir ( P.410)
12-volt battery ( P.411)
Radiator ( P.409)
Condenser ( P.409)
Electric cooling fans
With the engine at operating temperature and turned off,
check the oil level on the dip-
stick.
Engine compar tment
Components
Checking and adding the
engine oil

4488-2. Steps to take in an emergency
COROLLA HV_U
4Tighten down the towing eye-
let securely using a wheel nut
wrench or hard metal bar.
5 Securely attach cables or
chains to the towing eyelet.
Take care not to damage the vehi-
cle body.
6Enter the vehicle being towed
and start the hybrid system.
If the hybrid system does not start,
turn the power switch to ON.
7Shift the shift lever to N and
release the parking brake.
When the shift lever cannot
be shifted: P. 1 5 0
■While towing
If the hybrid system is off, the power
assist for the brakes and steering
will not function, making steering
and braking more difficult.
■Wheel nut wrench (vehicles
with a spare tire)
Wheel nut wrench is installed in
trunk. ( P.474)
 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.
 Changes in exhaust sound
 Excessive tire squeal when
cornering
 Strange noises related to the
suspension system
 Pinging or other noises
related to the hybrid system
 Engine missing, stumbling or
running roughly
 Appreciable loss of power
 Vehicle pulls heavily to one
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
Operational symptoms

4508-2. Steps to take in an emergency
COROLLA HV_U
■Brake system warning light (warning buzzer)
■Brake system warning light
■High coolant temperature warning light* (warning buzzer)
*: This light illuminat es on the multi-information display.
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 malfunction
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. Continuing to drive the vehi-
cle may be dangerous.
Warning lightDetails/Actions
(Yellow)
Indicates a malfunction in:
The regenerative braking system;
 The electronically contr olled brake system; or
 The parking brake system
 Have the vehicle inspected by your Toyota dealer
immediately.
Warning lightDetails/Actions
Indicates that the engine c oolant temperature is exces-
sively high
 Immediately stop the vehicle in a safe place.
Handling method ( P.489)

4908-2. Steps to take in an emergency
COROLLA HV_U
sides.
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 fans
If a large amount of coolant leaks,
immediately cont act your Toyota
dealer.
4 The coolant level is satisfac-
tory if it is between the
“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 coolant is unavailable.
6Start the hybrid system and
turn the air conditioning sys-
tem on to check that the radi-
ator cooling fans operate and
to check for coolant leaks
from the radiator or hoses.
The fans operate when the air con-
ditioning system is turned on imme-
diately after a cold start. Confirm
that the fans are operating by
c h e c k i n g t h e f a n s o u n d a n d a i r f l o w.
If it is difficult to check these, turn
the air conditioni ng system on and
off repeatedly. (The fans may not
operate in freezing temperatures.)
7 If the fans are not operating:
Stop the hybrid system
immediately and contact your
Toyota dealer.
If the fans are operating:
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.

4918-2. Steps to take in an emergency
COROLLA HV_U
8
When trouble arises
3 After the hybrid system has
cooled down, inspect the
hoses and radiator core (radi-
ator) for any leaks.
Radiator
Cooling fans
If a large amount of coolant leaks,
immediately cont act your Toyota
dealer.
4 The coolant level is satisfac-
tory if it is between the
“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 coolant is unavailable.
6
After 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 dis-
appear: Stop the hybrid sys-
tem and contact your Toyota
dealer.
If the message is not dis-
played: The hybrid system
temperature has dropped
and the vehicle may be
driven normally.
However, if the m essage appears
again frequently, contact your Toy-
ota dealer.
WA R N I N G
■When inspecting under the
hood of your vehicle
Observe the following precau-
tions. Failure to do so may result
in serious 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.