coolant temperature TOYOTA YARIS CROSS 2021 User Guide

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6-3. Do-it-yourself maintenance
the reservoir when the engine is
cold.
Reservoir cap
“F” line
“L” line
If the level is on or below the “L” line,
add coolant up to the “F” line. ( P.481)
■Power control unit coolant
reservoir
The coolant level is satisfactory if it
is between the “F” and “L” lines on
the reservoir when the hybrid sys-
tem is cold.
Reservoir cap
“F” line
“L” line
If the level is on or below the “L” line,
add coolant up to the “F” line. ( P.481)
■Coolant selection
Only use “Toyota Super Long Life Cool-
ant” 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.
“Toyota Super Long Life Coolant” is a mixture of 50% coolant and 50% deion-
ized water. (Minimum temperature: - 35°C [-31°F])
For more details about coolant, contact
any authorized Toyota retailer or Toyota authorized repairer, or any reliable repairer.
■If the coolant level drops within a
short time of replenishing
Visually check the radiator, hoses, engine/power control unit coolant reser-
voir caps, drain cock and water pump. If you cannot find a leak, have any authorized Toyota retailer or Toyota
authorized repairer, or any reliable repairer, test the cap and check for leaks in the cooling system.
WARNING
■When the hybrid system is hot
Do not remove the engine/power con-
trol unit coolant reservoir caps. ( P.483)
The cooling system may be under
pressure and may spray hot coolant 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 mix- ture of water and antifreeze must be used to provide proper lubrication,
corrosion protection and cooling. Be sure to read the antifreeze or coolant label.

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6-3. Do-it-yourself maintenance
Maintenance and care
Check the radiator and condenser
and clear away any foreign objects.
If either of the above parts is
extremely dirty or you are not sure
of their condition, have your vehicle
inspected by any authorized Toyota
retailer or Toyota authorized
repairer, or any reliable repairer.
If the washer fluid level is at “1/2”,
add washer fluid.
NOTICE
■If you spill coolant
Be sure to wash it off with water to
prevent it from damaging parts or paint.
Checking the radiator and
condenser
WARNING
■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.
Adding the washer fluid
WARNING
■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 leading to prob-
lems of the washer fluid not spraying.
■Diluting washer fluid
Dilute washer fluid with water as nec- essary.Refer to the freezing temperatures
listed on the label of the washer fluid bottle.

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7-2. Steps to take in an emergency
When trouble arises
ing more difficult.
■Wheel nut wrench*1, 2
Wheel nut wrench is installed in luggage compartment. ( P.464)*1: If equipped
*2: If your vehicles does not provide a
wheel nut wrench, you can purchase
it from any authorized Toyota retailer
or Toyota authorized repairer, or any
reliable repairer.
 Fluid leaks under the vehicle.
(Water dripping from the air con-
ditioning after use is normal.)
 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 cor-
nering
 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
WARNING
Observe the following precautions. Failure to do so may result in death or serious injury.
■While towing
●When towing using cables or
chains, avoid sudden starts, etc. which place excessive stress on the towing eyelets, cables or chains.
The towing eyelets, cables or chains may become damaged, bro-ken debris may hit people, and
cause serious damage.
●Do not turn the power switch off.
There is a possibility that the steer- ing wheel is locked and cannot be operated.
■Installing towing eyelets to the vehicle
Make sure that towing eyelets are installed securely.If not securely installed, towing eye-
lets may come loose during towing.
NOTICE
■To prevent damage to the vehicle during emergency towing
Do not secure cables or chains to the
suspension components.
If you think something is
wrong
If you notice any of the follow-
ing symptoms, your vehicle
probably needs adjustment or
repair. Contact any authorized
Toyota retailer or Toyota autho-
rized repairer, or any reliable
repairer as soon as possible.
Visible symptoms
Audible symptoms
Operational symptoms

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7-2. Steps to take in an emergency
When trouble arises
■Brake system warning light (warning buzzer)
■Brake system warning light
■High coolant temperature warning light* (warning buzzer)
*: This light illuminates on the multi-information display.
If a warning light turns on or a warning 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 g oes
off, this does not necessarily indicate a malfunction in the sy stem.
However, if this continues to o ccur, have the vehicle inspected by
any authorized Toyota retailer or Toyota authorized repairer, o r any
reliable repairer.
Actions to the warning lights or warning buzzers
Warning lightDetails/Actions
(Red)
Indicates that:
 The brake fluid level is low; or
 The brake system is malfunctioning
 Immediately stop the vehicle in a safe place and contact
any authorized Toyota retailer or Toyota authorized
repairer, or any reliable repairer. Continuing to drive the
vehicle may be dangerous.
Warning lightDetails/Actions
(Yellow)
Indicates a malfunction in:
 The regenerative braking system;
 The electronically controlled brake system; or
 The parking brake system
 Have the vehicle inspected by any authorized Toyota
retailer or Toyota authorized repairer, or any reliable
repairer immediately.
Warning lightDetails/Actions
Indicates that the engine coolant temperature is excessively hi gh
 Immediately stop the vehicle in a safe place.
Handling method ( P.481)

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7-2. Steps to take in an emergency
When trouble arises
If the engine coolant temperature
gauge enters the red zone or
“Engine Coolant Temp High Stop
in a Safe Place See Owner’s
Manual” is shown on the multi-
information display
1 Stop the vehicle in a safe place
and turn off the air conditioning
system, and then stop the hybrid
system.
2 If you see steam: Carefully lift
the hood after the steam sub-
sides.
If you do not see steam: Care-
fully lift the hood.
3 After the hybrid system has
cooled down sufficiently, inspect
the hoses and radiator core
(radiator) for any leaks.
Radiator
Cooling fan
If a large amount of coolant leaks,
immediately contact any authorized
Toyota retailer or Toyota authorized
repairer, or any reliable repairer.
4 The coolant level is satisfactory
if it is between the “F” and “L”
lines on the reservoir.
Reservoir
“F” line
“L” line
5 Add coolant if necessary.
Water can be used in an emergency if
If your vehicle overheats
The following may indicate that
your vehicle is overheating.
 The engine coolant tempera-
ture gauge ( P.100, 95) is 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 display.
 Steam comes out from under
the hood.
Correction procedures

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7-2. Steps to take in an emergency
coolant is unavailable.
6 Start the hybrid system and turn
the air conditioning system on to
check that the radiator cooling
fan operates and to check for
coolant leaks from the radiator
or hoses.
The fan operates when the air condi- tioning 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 hybrid system immediately
and contact any authorized
Toyota retailer or Toyota autho-
rized 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.
If “Hybrid System Overheated
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.
3 After the hybrid system has
cooled down, inspect the hoses
and radiator core (radiator) for
any leaks.
If a large amount of coolant leaks, immediately contact any authorized Toyota retailer or Toyota authorized
repairer, or any reliable repairer.
Radiator
Cooling fan
If a large amount of coolant leaks,
immediately contact any authorized
Toyota retailer or Toyota authorized
repairer, or any reliable repairer.
4 The coolant level is satisfactory
if it is between the “F” or “L”
lines on the reservoir.
Reservoir

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7-2. Steps to take in an emergency
When trouble arises
“F” line
“L” line
5 Add coolant if necessary.
If water was added in an emergency, have the vehicle inspected at any authorized Toyota retailer or Toyota
authorized repairer, or any reliable repairer as soon as possible.
6 After stopping the hybrid system
and waiting for 5 minutes or
more, start the hybrid system
again and check for the multi-
information display.
If the message does not disap-
pear: Stop the hybrid system
and contact any authorized
Toyota retailer or Toyota autho-
rized repairer, or any reliable
repairer.
If the message is not displayed:
The hybrid system temperature
has dropped and the vehicle
may be driven normally.
However, if the message appears again
frequently, contact 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.
●After the hybrid system has been turned off, check that the “READY”
indicator is off. When the hybrid system is operating, the gasoline engine may automatically start, or
the cooling fan may suddenly oper- ate even if the gasoline engine stops. Do not touch or approach
rotating parts such as the fan, which may lead to fingers or cloth-ing (especially a tie, a scarf or a
muffler) getting caught, resulting in serious injury.
●Do not loosen the coolant reservoir caps while the hybrid system and radiator are hot.
High temperature steam or coolant could spray out.
NOTICE
■When adding engine/power con-trol unit coolant
Add coolant slowly after the hybrid system has cooled down sufficiently. Adding cool coolant to a hot hybrid
system too quickly can cause dam- age to the hybrid system.
■To prevent damage to the cooling system
Observe the following precautions:
●Avoid contaminating the coolant with foreign matter (such as sand or
dust etc.).

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Alphabetical Index
E
eCall ................................................. 65
“SOS” button ................................ 65
ECB (Electronically Controlled Brake
System) ....................................... 336
Warning light .............................. 439
ECO Accelerator Guidance.. 108, 114
Eco drive mode ............................. 330
Eco score .............................. 108, 114
Elapsed time ......................... 110, 116
Electric motor (traction motor)...... 75
Electric Power Steering (EPS) ..... 336
Warning light .............................. 442
Electronic key ............................... 130
Battery-saving function .............. 153
If the electronic key does not operate
properly.................................... 474
Replacing the battery ................. 415
Electronically Controlled Brake Sys-
tem (ECB) .................................... 336
Warning light .............................. 439
Emergency brake signal .............. 336
Emergency flashers ..................... 430
Emergency tire puncture ............. 452
Emergency, in case of
If a warning buzzer sounds ........ 439
If a warning light turns on ........... 439
If a warning message is displayed
................................................. 449
If the 12-volt battery is discharged
................................................. 476
If the electronic key does not operate
properly.................................... 474
If the hybrid system will not start 472
If the vehicle is trapped in rising
water ........................................ 431
If you have a flat tire ........... 452, 463
If you lose your keys ..................473
If you think something is wrong .. 437
If your vehicle becomes stuck .... 484
If your vehicle has to be stopped in
an emergency .......................... 430
If your vehicle needs to be towed
................................................. 433
If your vehicle overheats ............481
Energy monitor .............................123
Engine ............................................ 489
ACC.................................... 190, 193
Compartment .............................389
Engine switch .....................189, 191
Hood........................................... 386
How to start the hybrid system . 189,
191
Identification number ..................489
If the hybrid system will not start 472
If your vehicle has to be stopped in
an emergency .......................... 430
Ignition switch (power switch) .. 189,
191
Overheating................................ 481
Power switch ...................... 189, 191
Tachometer ................................ 122
Engine coolant .............................. 391
Capacity ..................................... 492
Checking .................................... 391
Preparing and checking before win-
ter ............................................. 345
Engine coolant temperature gauge
...............................................95, 100
Engine oil....................................... 389
Capacity ..................................... 490
Checking .................................... 389
Preparing and checking before win-
ter ............................................. 345
Warning light .............................. 440

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Alphabetical Index
N
Navigation system-linked display
..................................... 109, 116, 119
O
Odometer ................................ 97, 104
Odometer and trip meter display
Display change button ......... 97, 104
Display items........................ 98, 104
Oil
Engine oil ................................... 490
Opener
Back door ........................... 141, 143
Fuel filler door ............................ 224
Hood .......................................... 386
Outside rear view mirrors
Adjustment ................................. 166
BSM (Blind Spot Monitor) .......... 270
Folding ....................................... 167
Outside rear view mirror defoggers
................................................. 352
RCTA (Rear Crossing Traffic Alert)
................................................. 285
Outside temperature ...... 95, 100, 122
Overheating .................................. 481
P
Panoramic roof shade .................. 373
Parking assist ............................... 301
Parking assist sensors (Toyota park-
ing assist-sensor) ...................... 275
Parking brake ................................ 200
Operation ................................... 200
Parking brake engaged warning
buzzer ...................................... 202
Warning light .............................. 446
Warning message ...................... 202
Parking Support Brake (PKSB) ... 291
Enabling/disabling the Parking Sup-
port Brake ................................ 292
Parking Support Brake function
(rear-crossing vehicles)............299
Parking Support Brake function
(static objects) .......................... 296
Warning lights.............................445
Warning message ...................... 295
PCS (Pre-Collision System) ......... 231
Enabling/disabling the pre-collision
system...................................... 235
Function ..................................... 231
Warning light .............................. 445
Personal lights .............................. 358
Wattage ...................................... 495
PKSB (Parking Support Brake) ... 291
Enabling/disabling the Parking Sup-
port Brake ................................ 292
Parking Support Brake function
(rear-crossing vehicles)............299
Parking Support Brake function
(static objects) .......................... 296
Warning lights.............................445
Warning message ...................... 295
Power back door opener switch.. 143
Power control unit .......................... 79
Power control unit coolant .......... 391
Capacity ..................................... 492
Checking .................................... 391
Preparing and checking before win-
ter ............................................. 345
Power mode .................................. 330
Power outlet .................................. 367
Power steering (Electric power
steering system) ......................... 336
Warning light .............................. 442

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Alphabetical Index
V
Vanity lights .................................. 371
Wattage ...................................... 495
Vanity mirrors ............................... 371
Vehicle data recording ..................... 7
Vehicle identification number...... 489
Vehicle information display . 110, 116
Vehicle Stability Control (VSC).... 336
VSC (Vehicle Stability Control).... 336
W
Warning buzzers
Approach warning ...................... 259
Brake hold .................................. 446
Brake Override System .............. 441
Brake system ............................. 439
Drive-Start Control ..................... 441
Electric power steering............... 442
Engine ........................................ 440
High coolant temperature........... 439
Hybrid system ............................ 440
Hybrid system overheat ............. 440
Key reminder.............................. 190
Low engine oil pressure ............. 440
LTA (Lane Tracing Assist) .. 242, 443
Open door .......................... 137, 138
PCS (Pre-Collision System) ....... 445
PKSB (Parking Support Brake) .. 445
RCTA (Rear Cross Traffic Alert) . 287
RCTA (Rear Crossing Traffic Alert)
................................................. 444
Seat belt ..................................... 442
SRS airbag................................. 441
Tire pressure .............................. 443
Toyota parking assist-sensor ... 275,
281, 444
Warning label .................................. 79
Warning lights ............................... 439
ABS ............................................ 441
Brake hold operated indicator .... 446
Brake Override System .............. 441
Brake system .............................439
Charging system ........................ 440
Drive-Start Control ..................... 441
Electric power steering ............... 442
High coolant temperature ........... 439
Hybrid system overheat ............. 440
Low engine oil pressure ............. 440
Low fuel level .............................442
LTA indicator ............................... 443
Malfunction indicator lamp ......... 440
Parking brake indicator .............. 446
PKSB OFF indicator ................... 445
Pre-collision system ................... 445
RCTA OFF indicator ................... 444
Seat belt reminder light .............. 442
Slip indicator............................... 446
SRS airbag ................................. 441
Tire pressure .............................. 443
Toyota parking assist-sensor OFF
indicator ...................................444
Warning messages .......................449
Washer ........................................... 219
Checking .................................... 393
Preparing and checking before win-
ter ............................................. 345
Switch......................................... 219
Washing and waxing .................... 376
Weight ............................................ 488
Wheels ........................................... 408
Replacing ...................................408
Size ............................................ 494
Window lock switch...................... 171