2020 TOYOTA YARIS HATCHBACK check engine light

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YARIS_YARIS HATCHBACK_OM_OM99V59z_(U)
4-1. Climate Control System
Operating Tips
• Operate the climate control system with the engine running.
• To prevent the battery from being discharged, do not leave the fan
control dial on for a long perio d of time with the ignition switched
ON when the engine is not running.
• Clear all obstructions such as l eaves, snow and ice from the hood
and the air inlet in t he cowl grille to imp rove the system efficiency.
• Use the climate control system to defog the windows and dehumi d-
ify the air.
• The recirculate mode should be used when driving through tunne ls
or while in a traffic jam, or when you would like to shut off o utside
air for quick cooling of the interior.
• Use the outside air position for ventilation or windshield defrosting.
• If the vehicle has been parked in direct sunlight during hot weather,
open the windows to let warm air escape, then run the climate con-
trol system.
• Run the air conditioner about 10 minutes at least once a month to
keep internal parts lubricated.
• Have the air conditioner checke d before the weather gets hot. Lack
of refrigerant may make the ai r conditioner less efficient.
The refrigerant specifications
are indicated on a label
attached to the inside of the
engine compartment. Check
the label before refilling the
refrigerant. If the wrong type of
refrigerant is used, it could
result in a serious malfunction
of the air conditioner.
For details, consult your Toyota
dealer.
Label

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YARIS_YARIS HATCHBACK_OM_OM99V59z_(U)
6-5. Overheating
Overheating
If the high engine coolant temperature warning light turns on:
Drive safely to the side of the road and park off the right-of-way.
Put a vehicle with an automatic t ransaxle in park (P), a manual tran-
saxle in neutral.
Apply the parking brake.
Turn off the air conditioner.
Check whether coolant or steam is escaping from the engine com-
partment.
If steam is coming from the engine compartment
Do not go near the front of t he vehicle. Stop the engine.
Wait until the steam dissipates, then open the hood and start the
engine.
If neither coolant nor steam is escaping
Open the hood and idle the engine until it cools.
Make sure the cooling fan is operating, then turn off the engin e after
the temperature has decreased.
When cool, check th e coolant level.
If it is low, look for coolant lea ks from the radiator and hoses.
■If you find a leak or other damage, or if coolant is still leak ing:
Stop the engine and call your Toyota dealer.
Cooling fan
Cooling system cap
Coolant reservoir
If the high engine coolant temperature warning light turns on,
the vehicle loses power, or you hear a loud knocking or pinging
noise, the engine is probably too hot.
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4906-7. Warning/Indicator Lights and Warning Sounds
YARIS_YARIS HATCHBACK_OM_OM99V59z_(U)
Electronic Brake Force Distribution System Warning
If the electronic brake force distribution control unit deter-
mines that some components are operating incorrectly,
the control unit may illuminate the brake system warning
light and the ABS warning light simultaneously. The prob-
lem is likely to be the electronic brake force distribution
system.
Charging System Warning Light
If the warning light illuminates while driving, it indicates a
malfunction of the alternator or of the charging system.
Drive to the side of the road and park off the right-of-way.
Consult your Toyota dealer.
Engine Oil Warning LightThis warning light indicates low engine oil pressure.
If the light illuminates or the warning indication is dis-
played while driving:
Drive to the side of the road and park off the right-of-
way on level ground.
Turn off the engine and wait 5 minutes for the oil to
drain back into the oil pan.
Inspect the engine oil level P. 397. If it’s low, add the
appropriate amount of engine oil while being careful
not to overfill.
Start the engine and check the warning light.
If the light remains illuminated even though the oil level is
normal or after adding oil, stop the engine immediately
and have your vehicle towed to your Toyota dealer.
SignalWarning
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4926-7. Warning/Indicator Lights and Warning Sounds
YARIS_YARIS HATCHBACK_OM_OM99V59z_(U)
■Power Steering Malfunction Indicator Light
●If the indicator light illuminates/flashes, the power steering will not operate
normally. If this happens, the steering wheel can still be operated, however,
the operation may feel heavy compared to normal, or the steering wheel
could vibrate when turning.
● Repeatedly jerking the steering wheel left and right while the vehicle is
stopped or moving extremely slowly will cause the power steerin g system to
go into protective mode which will make the steering feel heavy , but this
does not indicate a problem. If this occurs, park the vehicle safely and wait
several minutes for the system to return to normal.
WARNING
■ Do not drive with the brake system warning light illuminated. C ontact
your Toyota dealer to have the brakes inspected as soon as poss ible
Driving with the brake system warning light illuminated is dang erous. It indi-
cates that your brakes may not work at all or that they could c ompletely fail
at any time. If this light remains illuminated, after checking that the parking
brake is fully released, have the brakes inspected immediately.
In addition, the effectiveness of the braking may diminish so y ou may need
to depress the brake pedal more strongly than normal to stop th e vehicle.
■ Do not drive with both the ABS warning light and brake warning light
illuminated. Have the vehicle towed to your Toyota dealer to have the
brakes inspected as soon as possible
Driving when the brake system warning light and ABS warning lig ht are illu-
minated simultaneously is dangerous.
When both lights are illuminated, the rear wheels could lock mo re quickly in
an emergency stop than under normal circumstances.
NOTICE
■ Charging System Warning Light
Do not continue driving when the charging system warning light is illumi-
nated because the engine could stop unexpectedly.
■ Engine Oil Warning Light
● Do not run the engine if the oil pressure is low. Otherwise, it could result in
extensive engine damage.
● Do not run the engine if the oil level is low. Otherwise, it co uld result in
extensive engine damage.
■ High Engine Coolant Temperature Warning Light
Do not drive the vehicle with the high engine coolant temperatu re warning
light illuminated. Otherwise, it could result in damage to the engine.

YARIS_YARIS HATCHBACK_OM_OM99V59z_(U)
4936-7. Warning/Indicator Lights and Warning Sounds
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If Trouble Arises
If any of the following warning lights turns on/flashes, the system may
have a malfunction. Contact your Toyota dealer to have your veh icle
inspected.
Contact Your Toyota Dealer and Have Vehicle Inspected
SignalWarning
Master Warning Light The light turns on when the system has a malfunction.
Operate the center display and verify the content.
Refer to If a Warning Light Turns On or Flashes on P. 489.
ABS Warning LightIf the ABS warning light stays on while you’re driving, the
ABS control unit has detected a system malfunction. If this
occurs, your brakes will function normally as if the vehicle
had no ABS.
Should this happen, consult your Toyota dealer as soon as
possible.
Check Engine Light
If this light illuminates while driving, the vehicle may have
a problem. It is important to note the driving conditions
when the light illuminated and consult your Toyota dealer.
The check engine light may illuminate in the following
cases:
• The fuel tank level being very low or approaching empty.
• The engine’s electrical system has a problem.
• The emission control system has a problem.
• The fuel-filler cap is missing or not tightened securely.
If the check engine light remains on, or it flashes continu-
ously, do not drive at high speeds and consult your Toyota
dealer as soon as possible.
(if equipped)
Automatic Transaxle Warning LightThe light illuminates when the transaxle has a problem.
(Illuminate)
TCS/DSC Indicator LightIf the light stays on, the TCS, DSC or the brake assist sys-
tem may have a malfunction and they may not operate
correctly. Take your vehicle to your Toyota dealer.
Air Bag/Front Seat Belt Pretensioner System Warning
LightA system malfunction is indicated if the warning light con-
stantly flashes, constantly illuminates or does not illumi-
nate at all when the ignition is switched ON. If any of these
occur, consult your Toyota dealer as soon as possible.
The system may not operate in an accident.

4946-7. Warning/Indicator Lights and Warning Sounds
YARIS_YARIS HATCHBACK_OM_OM99V59z_(U)
■ABS Warning Light
●When the engine is jump-started to charge the battery, uneven r pm occurs
and the ABS warning light may illuminate. If this occurs, it is the result of the
weak battery and does not indicate an ABS malfunction.
Recharge the battery.
● The brake assist system does not operate while the ABS warning light is illu-
minated.
(Flashing)
(if equipped)
Tire Pressure Monitoring System Warning Light
If the tire pressure monito ring system has a malfunc-
tion, the tire pressure warning light flashes for about 1
minute when the ignition is switched ON and then con-
tinues illuminating. Have your vehicle checked by your
Toyota dealer as soon as possible.
(Red)
(Illuminate)
KEY Warning Light
If any malfunction occurs in the keyless entry system, it
illuminates continuously.
Refer to Emergency Operation for Starting the Engine on
P. 162.
(if equipped)
LED Headlight Warning LightThis light illuminates if there is a malfunction in the LED
headlight. Have your vehicle inspected by your Toyota
dealer.
SignalWarning

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4956-7. Warning/Indicator Lights and Warning Sounds
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If Trouble Arises
WARNING
■Never tamper with the air bag/pr etensioner systems and always h ave
your Toyota dealer perform all servicing and repairs
Self-servicing or tampering with the systems is dangerous. An a ir bag/pre-
tensioner could accidentally activate or become disabled causin g serious
injury or death.
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If the tire pressure monitoring system warning light illuminate s or
flashes, or the tire pressure warning beep sound is heard, decr ease
vehicle speed immediately and avoid sudden maneuvering and
braking
If the tire pressure monitoring system warning light illuminate s or
flashes, or the tire pressure war ning beep sound is heard, it is danger-
ous to drive the vehicle at high speeds, or perform sudden mane uvering
or braking. Vehicle drivability co uld worsen and result in an accident.
To determine if you have a slow leak or a flat, pull over to a safe position
where you can check the visual condition of the tire and determ ine if you
have enough air to proceed to a place where air may be added an d the
system monitored again by your Toyota dealer or a tire repair s tation.
■Do not ignore the TPMS Warning Light
Ignoring the TPMS warning light is dangerous, even if you know why it
is illuminated. Have the problem taken care of as soon as possi ble
before it develops into a more serious situation that could lea d to tire
failure and a dangerous accident.
NOTICE
■ Automatic Transaxle Warning Light
If the automatic transaxle warning light illuminates, the trans axle has an
electrical problem. Continuing to drive your Toyota in this condition could
cause damage to your transaxle. Consult your Toyota dealer as s oon as
possible.
■ KEY Warning Light
If the key warning indicator light illuminates or the push button start indicator
light (amber) flashes, the engine may not start. If the engine cannot be
started, try starting it using the emergency operation for star ting the engine,
and have the vehicle inspected at your Toyota dealer as soon as possible.

4966-7. Warning/Indicator Lights and Warning Sounds
YARIS_YARIS HATCHBACK_OM_OM99V59z_(U)
Take the appropriate action and verify that the warning light turns off.
Taking Action
SignalWarningAction to be taken
Low Fuel Warning Light The light turns on when the
remaining fuel is about 2.3
gal. (9.0 L, 1.9 Imp.gal.). Add fuel.
Check Fuel Cap Warning
Light
If the check fuel cap warning
light illuminates while driving,
the fuel-filler cap may not be
installed properly.
Stop the engine and rein-
stall the fuel-filler cap.
Refer to Refueling on
P. 125
Seat Belt Warning LightThe seat belt warning light
turns on if the driver or front
passenger’s seat is occupied
and the seat belt is not fas-
tened with the ignition
switched ON.
If the driver or front passen-
ger’s seat belt is unfastened
(only when the front passen-
ger’s seat is occupied) and
the vehicle is driven at a
speed faster than about 12
mph (20 km/h), the warning
light flashes. After a short
time, the warning light stops
flashing, but remains illumi-
nated.
Fasten the seat belts.
Door-Ajar Warning LightThe light turns on if any door/
trunk lid/liftgate is not closed
securely.
Close the door/trunk lid/
liftgate securely.
(if equipped)
Low Washer Fluid Level
Warning LightThis warning light indicates
that little washer fluid
remains.
Add washer fluid
(P. 402).