check engine TOYOTA YARIS HATCHBACK 2021 Service Manual

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7-2. Steps to take in an emergency
When trouble arises
■Warning messages
The warning messages explained below
may differ from the actual messages according to operation conditions and vehicle specifications.
■Warning buzzer
A buzzer may sound when a message 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 the
level of the engine oil, and add if neces-
sary.
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 disappears.
■If “Engine Stopped Steering Power Low” is displayed
This message is displayed if the engine is stopped while driving.
When steering wheel operations are
heavier than usual, grip the steering wheel firmly and operate it using more force than usual.
■If “Auto Power OFF to Conserve
Battery” is displayed
Power was cut off due to the automatic power off function. Next time when start-
ing the engine, increase the engine speed slightly and maintain that level for approximately 5 minutes to recharge the
battery.
■If “Headlight System Malfunction Visit Your Dealer” is displayed
The following systems may be malfunc-
tioning. Have the vehicle inspected by any authorized Toyota retailer or Toyota authorized repairer, or any reliable
repairer immediately.
●The LED headlight system (if
equipped)
●Automatic High Beam (if equipped)
■If “Front Camera Out of Tempera-
ture Range Unavailable Wait until Normal Temperature”, “Front Cam-era Low Visibility Unavailable See
Owner’s Manual” or “Front Camera Unavailable See Owner’s Manual” is displayed
The following systems may be sus- pended until the problem shown in the message is resolved. ( →P.191, 368)
●PCS (Pre-Collision system) (if equipped)
●LTA (Lane Tracing Assist) (if equipped)
●Automatic High Beam (if equipped)
If a warning message is
displayed
The multi-information display
shows warnings for system
malfunctions and incorrectly
performed operations, and
messages that indicate a need
for maintenance. When a mes-
sage is displayed, perform the
appropriate corrective action
for the message.
If a warning message is dis-
played again after the appro-
priate actions have been
performed, contact any autho-
rized Toyota retailer or Toyota
authorized repairer, or any reli-
able repairer.
Additionally, if a warning light
comes on or flashes at the
same time that a warning mes-
sage is displayed, take the
appropriate corrective action
for the warning light. ( →P.368)

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7-2. Steps to take in an emergency
●RSA (Road Sign Assist) (if equipped)
●Dynamic radar cruise control (if equipped)
■If “Pre-Collision System Unavail-
able See Owner’s Manual”, “Pre- Collision System Out of Tempera-ture Range Unavailable See
Owner’s Manual” or “Pre-Collision System Radar In Self Calibration Unavailable See Owner’s Manual”
is displayed
The following systems may be sus- pended until the problem shown in the
message is resolved. ( →P.191, 368)
●PCS (Pre-Collision system)
●LTA (Lane Tracing Assist)
●Dynamic radar cruise control
■If “Oil Maintenance Required Soon” is displayed
Indicates that the engine oil should be
scheduled to be changed.
Check the engine oil and change it if necessary.
After changing the engine oil, make sure to reset the message. ( →P.323)
■If “Oil Maintenance Required Visit Your Dealer” is displayed
Indicates that the engine oil should be changed.
Check and change the engine oil, and
oil filter by any authorized Toyota retailer or Toyota authorized repairer, or any reli-able repairer. After changing the engine
oil, make sure to reset the message. ( →P.323)
■If “Radar Cruise Control Unavail- able See Owner’s Manual” is dis-
played (if equipped)
The dynamic radar cruise control sys- tem is suspended temporarily or until
the problem shown in the message is resolved. (causes and coping methods: → P.191)
■If “Radar Cruise Control Unavail-
able” is displayed (if equipped)
The dynamic radar cruise control sys-
tem cannot be used temporarily. Use the
system when it becomes available again.
■If a message that indicates the need for visiting your Toyota dealer
is displayed
The system or part shown on the multi- information display is malfunctioning.
Have the vehicle inspected by any authorized Toyota retailer or Toyota authorized repairer, or any reliable
repairer immediately.
■If a message that indicates the need for referring to Owner’s Man-ual is displayed
●If “Engine Coolant Temp High” is dis-played, follow the instructions accord-
ingly. ( →P.405)
●If “Transmission Oil Temp. High” is
displayed, follow the instructions accordingly. ( →P.164)
●If “Exhaust Filter Full” is displayed, fol- low the instructions accordingly. ( →P.267)
●If any of the following messages are displayed on the multi-information dis-
play, it may indicate a malfunction. Have the vehicle inspected by any authorized Toyota retailer or Toyota
authorized repairer, or any reliable repairer immediately.• “Smart Entry & Start System Malfunc-
tion”
●If any of the following messages are
displayed on the multi-information dis- play, it may indicate a malfunction. Immediately stop the vehicle and con-
tact any authorized Toyota retailer or Toyota authorized repairer, or any reli-able repairer.
• “Braking Power Low” • “12-Volt Battery Charging System Malfunction”
•“Oil Pressure Low”

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7-2. Steps to take in an emergency
When trouble arises
zStop the vehicle in a safe place
on a hard, flat surface.
z Set the parking brake.
z Shift the shift lever to P (Multid-
rive) or N (manual transmission).
z Stop the engine.
z Turn on the emergency flashers.
( →P.360)
z Check the degree of the tire
damage.
Do not remove the nail or screw
from the tire. Removing the object
may widen the opening and make
emergency repair with the repair kit
impossible.
■A flat tire that cannot be repaired with the emergency tire puncture repair kit
In the following cases, the tire cannot be repaired with the emergency tire punc-
If you have a flat tire
(vehicles with an emer-
gency tire puncture
repair kit)
Your vehicle is not equipped
with a spare tire, but instead is
equipped with an emergency
tire puncture repair kit.
A puncture caused by a nail or
screw passing through the tire
tread can be repaired tempo-
rarily using the emergency tire
puncture repair kit. (The kit
contains a bottle of sealant.
The sealant can be used only
once to temporarily repair one
tire without removing the nail
or screw from the tire.)
Depending on the damage, this
kit cannot be used to repair the
tire. ( →P.379)
After temporarily repairing the
tire with the kit, have the tire
repaired or replaced by any
authorized Toyota retailer or
Toyota authorized repairer, or
any reliable repairer. Repairs
conducted using the emer-
gency tire puncture repair kit
are only a temporary measure.
Have the tire repaired and
replaced as soon as possible.
WARNING
■If you have a flat tire
Do not continue driving with a flat tire.
Driving even a short distance with a flat tire can damage the tire and the wheel beyond repair, which could
result in an accident.
Before repairing the tire

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7-2. Steps to take in an emergency
10Connect the power plug to the
power outlet socket. ( →P.299)
11 Check the specified tire inflation
pressure.
Tire inflation pressure is specified on the label on the driver’s side door frame as shown. ( →P.417)
Left-hand drive vehicles
Right-hand drive vehicles
12 Start the vehicle’s engine.
13 To inject the sealant and inflate
the tire, turn the compressor
switch on.
14 Inflate the tire until the specified
air pressure is reached.
The sealant will be injected and
the pressure will surge and then
gradually decrease.
The air pressure gauge will dis-
play the actual tire inflation pres-
sure about 1 minute (5 minutes
at low temperature) after the

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7-2. Steps to take in an emergency
tions may be loose or corroded.
( →P.325)
The engine starting system may be
malfunctioning due to an electrical
problem such as electronic key bat-
tery depletion or a blown fuse.
However, an interim measure is
available to start the engine.
( →P.398)
One of the following may be the
cause of the problem:
z The battery may be discharged.
( →P.401)
z One or both of the battery termi-
nals may be disconnected.
( →P.325)
z There may be a malfunction in
the steering lock system (vehi-
cles with smart entry & start sys-
tem).
Contact any authorized Toyota retailer
or Toyota authorized repairer, or any
reliable repairer if the problem cannot
be repaired, or if repair procedures are
unknown.
When the engine does not start, the
following steps can be used as an
interim measure to start the engine
if the engine switch is functioning
normally.
Do not use this starting procedure
except in case of emergency.
1 Set the parking brake.
2 Check that the shift lever is in P
(Multidrive) or N (manual trans-
mission).
3 Turn the engine switch to ACC.
4 Press and hold the engine
switch for about 15 seconds
while depressing the brake
pedal (Multidrive) or clutch
pedal (manual transmission)
firmly.
Even if the engine can be started using
the above steps, the system may be
malfunctioning. Have the vehicle
inspected by any authorized Toyota
retailer or Toyota authorized repairer, or
any reliable repairer.
The starter motor does not
turn over (vehicles with a
smart entry & start system)
The starter motor does not
turn over, the interior lights
and headlights do not turn
on, or the horn does not
sound.
Emergency start function
(vehicles with a smart entry
& start system)

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7-2. Steps to take in an emergency
When trouble arises
■When the electronic key does not work properly
●Make sure that the smart entry & start system has not been deactivated in
the customization setting. If it is off, turn the function on. (Customizable features: →P.422)
●Check if battery-saving mode is set. If it is set, cancel the function. ( →P.124)
If you lose your keys
New genuine keys can be
made by any authorized Toyota
retailer or Toyota authorized
repairer, or any reliable
repairer using the other key
(vehicles without a smart entry
& start system) or mechanical
key (vehicles with a smart
entry & start system) and the
key number stamped on your
key number plate.
Keep the plate in a safe place
such as your wallet, not in the
vehicle.
NOTICE
■When an electronic key is lost
(vehicles with a smart entry & start system)
If the electronic key remains lost, the
risk of vehicle theft increases signifi- cantly. Visit any authorized Toyota retailer or Toyota authorized repairer,
or any reliable repairer immediately with all remaining electronic keys that were provided with your vehicle.
If the electronic key
does not operate prop-
erly (vehicles with a
smart entry & start sys-
tem)
If communication between the
electronic key and vehicle is
interrupted ( →P.124) or the
electronic key cannot be used
because the battery is
depleted, the smart entry &
start system and wireless
remote control cannot be used.
In such cases, the doors can
be opened and the engine can
be started by following the pro-
cedure below.
NOTICE
■In case of a smart entry & start system malfunction or other key-related problems
Take your vehicle with all the elec- tronic keys provided with your vehicle to any authorized Toyota retailer or
Toyota authorized repairer, or any reli- able repairer.

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7-2. Steps to take in an emergency
Use the mechanical key (→P. 1 1 5 )
in order to perform the following
operations:
1 Locks all the doors
2 Unlocks all the doors
■Key linked functions
1 Closes the windows (turn and hold)*
2Opens the windows (turn and hold)*
*: These settings must be customized at
any authorized Toyota retailer or
Toyota authorized repairer, or any reli-
able repairer.
1 Vehicles with a Multidrive:
Ensure that the shift lever is in P
and depress the brake pedal.
Vehicles with a manual trans-
mission: Shift the shift lever to N
and depress the clutch pedal.
2 Touch the area behind the lock
button and unlock button on the
electronic key to the engine
switch.
When the electronic key is detected, a
buzzer sounds and the engine switch will turn to ON.
When the smart entry & start system is
deactivated in customization setting, the engine switch will turn to ACC.
Locking and unlocking the
doors
WARNING
■When using the mechanical key and operating the power win-
dows
Operate the power window after checking to make sure that there is no
possibility of any passenger having any of their body parts caught in the window.
Also, do not allow children to operate the mechanical key. It is possible for children and other passengers to get
caught in the power window.
Starting the engine

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7-2. Steps to take in an emergency
When trouble arises
3Firmly depress the brake pedal
(Multidrive) or clutch pedal
(manual transmission) and
check that is shown on the
multi-information display.
4 Press the engine switch shortly
and firmly.
In the event that the engine still
cannot be started, contact any
authorized Toyota retailer or Toyota
authorized repairer, or any reliable
repairer.
■Stopping the engine
Shift the shift lever to P (Multidrive) or N (manual transmission) and press the
engine switch as you normally do when stopping the engine.
■Electronic key battery
As the above procedure is a temporary
measure, it is recommended that the electronic key battery be replaced immediately when the battery is
depleted. ( →P.345)
■Alarm (if equipped)
Using the mechanical key to lock the doors will not set the alarm system.
If a door is unlocked using the mechani- cal key when the alarm system is set, the alarm may be triggered. ( →P. 7 8 )
■Changing engine switch modes
Release the brake pedal (Multidrive) or clutch pedal (manual transmission) and press the engine switch in step 3 above.
The engine does not start and modes will be changed each time the switch is pressed. ( →P.162)
If you have a set of jumper (or
booster) cables and a second vehi-
cle with a 12-volt battery, you can
jump start your vehicle by following
the steps below.
1 Vehicles with an alarm (→P. 7 8 ) :
Confirm that the key is being
carried.
When connecting the jumper (or
booster) cables, depending on the situ- ation, the alarm may activate and doors locked. ( →P. 7 9 )
2Open the hood. (→P.317)
If the vehicle battery is
discharged
The following procedures may
be used to start the engine if
the vehicle’s battery is dis-
charged.
You can also call any autho-
rized Toyota retailer or Toyota
authorized repairer, or any reli-
able repairer or a qualified
repair shop.
Restarting the engine

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7-2. Steps to take in an emergency
to the mode it was in before the bat-
tery was discharged. Before discon- necting the battery, turn the engine switch off.
If you are unsure what mode the engine switch was in before the bat-tery discharged, be especially careful
when reconnecting the battery.
■When replacing the battery
●Use a battery that conforms to Euro-
pean regulations.
●Use a battery that the case size is
same as the previous one, 20 hour rate capacity (20HR) is equivalent or greater, and performance rating
(CCA) is equivalent or greater. Check the label on top of the battery for the battery size and specifications (ex.
LN2, 60Ah, 345A). • If the sizes differ, the battery cannot be properly secured.
• If the 20 hour rate capacity is low, even if the time period where the vehi-cle is not used is a short time, the bat-
tery may discharge and the engine may not be able to start.
●For details, consult any authorized Toyota retailer or Toyota authorized repairer, or any reliable repairer.
WARNING
■When removing the battery ter-minals
Always remove the negative (-) termi-
nal first. If the positive (+) terminal contacts any metal in the surrounding area when the positive (+) terminal is
removed, a spark may occur, leading to a fire in addition to electrical shocks and death or serious injury.
■Avoiding battery fires or explo-sions
Observe the following precautions to prevent accidentally igniting the flam-mable gas that may be emitted from
the battery:
●Make sure each jumper cable is connected to the correct terminal and that it is not unintentionally in
contact with any other than the intended terminal.
●Do not allow the other end of the jumper cable connected to the “+” terminal to come into contact with
any other parts or metal surfaces in the area, such as brackets or unpainted metal.
●Do not allow the + and - clamps of the jumper cables to come into con-
tact with each other.
●Do not smoke, use matches, ciga-
rette lighters or allow open flame near the battery.
■Battery precautions
The battery contains poisonous and corrosive acidic electrolyte, while
related parts contain lead and lead compounds. Observe the following precautions when handling the bat-
tery:
●When working with the battery,
always wear safety glasses and take care not to allow any battery fluids (acid) to come into contact
with skin, clothing or the vehicle body.
●Do not lean over the battery.
●In the event that battery fluid comes
into contact with the skin or eyes, immediately wash the affected area with water and seek medical atten-
tion. Place a wet sponge or cloth over the affected area until medical attention can be received.
●Always wash your hands after han-dling the battery support, terminals,
and other battery-related parts.
●Do not allow children near the bat-
tery.

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7-2. Steps to take in an emergency
When trouble arises
M15A-FKS engine
6 Start the engine and turn the air
conditioning system on to check
that the radiator cooling fan
operate and to check for coolant
leaks from the radiator or hoses.
The fan operate when the air condition- ing system is turned on immediately after a cold start. Confirm that the fan is
operating by checking the fan sound and air flow. If it is difficult to check these, turn the air conditioning system
on and off repeatedly. (The fan may not operate in freezing temperatures.)
7 If the fan is not operating: Stop
the engine immediately and
contact any authorized Toyota
retailer or Toyota authorized
repairer, or any reliable repairer.
If the fan is operating: Have the
vehicle inspected at the nearest
any authorized Toyota retailer or
Toyota authorized repairer, or
any reliable repairer.
WARNING
■When inspecting under the hood of your vehicle
Observe the following precautions.
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 subsided. The
engine compartment may be very hot.
●Keep hands and clothing (espe-cially a tie, a scarf or a muffler) away from the fan and belts. Failure
to do so may cause the hands or clothing to be caught, resulting in serious injury.
●Do not loosen the coolant reservoir caps while the engine and radiator
are hot. High temperature steam or coolant could spray out.
NOTICE
■When adding engine coolant
Add coolant slowly after the engine has cooled down sufficiently. Adding
cool coolant to a hot engine too quickly can cause damage to the engine.
■To prevent damage to the cooling system
Observe the following precautions:
●Avoid contaminating the coolant
with foreign matter (such as sand or dust etc.).
●Do not use any coolant additive.