engine TOYOTA COROLLA HYBRID 2020 (in English) Service Manual

4077-3. Do-it-yourself maintenance
COROLLA HV_U
7
Maintenance and care
■Checking the engine oil
1 Park the vehicle on level
ground. After warming up the
engine and turning off the
hybrid system, wait more
than 5 minutes for the oil to
drain back into the bottom of
the engine.
2 Holding a rag under the end,
pull the dipstick out.
3 Wipe the dipstick clean.
4 Reinsert the dipstick fully.
5 Holding a rag under the end,
pull the dipstick out and
check the oil level.
Low
Normal
Excessive
The shape of the dipstick may differ
depending on the type of vehicle or
engine.
6Wipe the dipstick and reinsert
it fully.
■Checking the oil type and
preparing the item needed
Make sure to check the oil type
and prepare the items needed
before adding oil.
 Engine oil selection
P.498
 Oil quantity (Low  Full)
1.6 qt. (1.5 L, 1.3 Imp. qt.)
 Item
Clean funnel
■Adding engine oil
If the oil level is below or near
the low level mark, add engine
oil of the same type as that
already in the engine.
1 Remove the oil filler cap by
turning it counterclockwise.
2 Add engine oil slowly, check-
ing the dipstick.
3 Install the oil filler cap by
turning it clockwise.
■Engine oil consumption
A certain amount of engine oil will
be consumed while driving. In the
following situatio ns, oil consump-

4087-3. Do-it-yourself maintenance
COROLLA HV_Ution may increase, and engine oil
may need to be refilled in between
oil maintenance intervals.
●When the engine is new, for
example directly after purchasing
the vehicle or after replacing the
engine
●If low quality oil or oil of an inap-
propriate viscosity is used
●When driving at high engine
speeds or with a
heavy load, or
when driving while accelerating or
decelerating frequently
●When leaving the engine idling for
a long time, or wh en driving fre-
quently through heavy traffic
■Engine coolant reservoir
The coolant level is satisfactory
if it is between the “FULL” and
“LOW” lines on the reservoir
when the engine is cold.
Reservoir cap
“FULL” line
“LOW” line
If the level is on or below the “LOW”
line, add coolant up to the “FULL”
line. ( P.489)
■Power control unit coolant
reservoir
The coolant level is satisfactory
if it is between the “FULL” and
“LOW” lines on the reservoir
when the hybrid system is cold.
WA R N I N G
■Used engine oil
●Used engine oil contains poten-
tially harmful contaminants
which may cause skin disorders
such as inflammation and skin
cancer, so care should be taken
to avoid prolonged and
repeated contact. To remove
used engine oil from your skin,
wash thoroughly with soap and
water.
●Dispose of used oil and filters
only in a safe an d acceptable
manner. Do not dispose of used
oil and filters in household trash,
in sewers or onto the ground.
Call your Toyota dealer, service
station or auto parts store for
information concerning recy-
cling or disposal.
●Do not leave used engine oil
within the rea ch of children.
NOTICE
■To prevent serious engine
damage
Check the oil level on a regular
basis.
■When replacing the engine oil
●Be careful not to spill engine oil
on the vehicle components.
●Avoid overfilling, or the engine
could be damaged.
●Check the oil level on the dip-
stick every time you refill the
vehicle.
●Be sure the engin e oil filler cap
is properly tightened.
Checking the coolant

4097-3. Do-it-yourself maintenance
COROLLA HV_U
7
Maintenance and care
Reservoir cap
“FULL” line
“LOW” line
I f t he le ve l is on o r be low th e “L O W ”
line, add coolant up to the “FULL”
line. ( P.489)
■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 tem-
perature: -31°F [-35°C])
Canada:
“Toyota Super Long Life Coolant” is
a mixture of 55% coolant and 45%
deionized water. (Minimum tem-
perature: -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/power control unit coolant
reservoir caps, 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 and con-
denser and clear away any for-
eign objects. If either of the
above parts is extremely dirty or
you are not sure of their condi-
tion, have your vehicle
inspected by your Toyota dealer.
WA R N I N G
■When the hybrid system is
hot
Do not remove the engine/power
control unit coolant reservoir
caps.
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
B e s ur e to wa sh it o ff with w at er to
prevent it from damaging parts or
paint.
Checking the radiator and
condenser
WA R N I N G
■When the hybrid system is
hot
Do not touch the radiator or con-
denser as they may be hot and
cause serious injuries, such as
burns.

4137-3. Do-it-yourself maintenance
COROLLA HV_U
7
Maintenance and care
Check if the treadwear indica-
tors are showing on the tires.
Also check the tires for uneven
wear, such as excessive wear
on one side of the tread.
Check the spare tire condition
and pressure if not rotated. New tread
Worn tread
Treadwear indicator
The location of treadwear indicators
is shown by a “TWI” or “ ” mark,
WA R N I N G
■When adding washer fluid
Do not add washer fluid when the
hybrid system is hot or operating
as washer fluid contains alcohol
and may catch fire if spilled on the
engine, etc.
NOTICE
■Do not use any fluid other
than washer fluid
Do not use soapy water or engine
antifreeze instead of washer fluid.
Doing so may cause streaking on
the vehicle’s painted surfaces, as
well as damaging the pump lead-
ing to problems of the washer
fluid not spraying.
■Diluting washer fluid
Dilute washer flui d with water as
necessary.
Refer to the freezing tempera-
tures listed on the label of the
washer fluid bottle.
Tires
Replace or rotate tires in
accordance with mainte-
nance schedules and tread-
wear.
Checking tires

4337-3. Do-it-yourself maintenance
COROLLA HV_U
7
Maintenance and care
1 Turn the power switch off.
2 Open the fuse box cover.
Engine compartment: type A
fuse box
Push the tabs in and lift the lid off.
Engine compartment: type B
fuse box
Push the tabs in and lift the lid off.
Under the driver’s side instru-
ment panel
Remove the lid.
Make sure to push the claw when
removing/installing the lid.
3Remove the fuse with the
pullout tool.
Only type A fuse can be
removed using the pullout
tool.
4 Check if the fuse is blown.
Replace the blown fuse with a new
fuse of an appropriate amperage
rating. The amperage rating can be
found on the fuse box lid.
Checking and replac-
ing fuses
If any of the electrical com-
ponents do not operate, a
fuse may have blown. If this
happens, check and replace
the fuses as necessary.
Checking and replacing
fuses

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)

4518-2. 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.489)
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;
 The electronic throttle control system; or
 The electronic hybrid tr ansmission control system
 Immediately stop the vehicle in a safe place and con-
tact your Toyota dealer.

4598-2. Steps to take in an emergency
COROLLA HV_U
8
When trouble arises■Warning messages
The warning messages explained
below may differ from the actual
messages according to operation
conditions and vehicle specifica-
tions.
■Warning buzzer
A buzzer may sound when a mes-
sage is displayed.
The buzzer may not be audible if the
vehicle is in a noisy location or if the
audio system volume is high.
■If “Engine Oil Level Low Add or
Replace” is displayed
The engine oil level is low. Check
WA R N I N G
TPMS (tire pressure warning sys-
tem) malfunctions may occur for a
variety of reasons, including the
installation of replacement or
alternate tires or wheels on the
vehicle that prevent the TPMS
(tire pressure warning system)
from functioning properly. Always
check the TPMS (tire pressure
warning system) malfunction tell-
tale after replacing one or more
tires or wheels on your vehicle to
ensure that the r eplacement or
alternate tires and wheels allow
the TPMS (tire pressure warning
system) to continue to function
properly.
NOTICE
■To ensure the tire pressure
warning system operates
properly (vehicles with a tire
pressure warning system)
Do not install tires with different
specifications or makers, as the
tire pressure warning system may
not operate properly.
If a war ning message
is displayed
The multi-information dis-
play shows warnings for
system malfunctions and
incorrectly performed oper-
ations, and messages that
indicate a need for mainte-
nance. When a message is
displayed, perform the
appropriate corrective
action for the message.
If a warning message is dis-
played again after the
appropriate actions have
been performed, contact
your Toyota dealer.
Additionally, if a warning
light comes on or flashes at
the same time that a warn-
ing message is displayed,
take the appropriate correc-
tive action for the warning
light. ( P.450)

4608-2. 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. 4 8 9
■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 “Front Camera Unavailable”
or “Front Camera Unavailable
See Owner’s Manual” is dis-
played
The following systems may be sus-
pended until the problem shown in
the message is resolved. (P.172,
450)
●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