2018 TOYOTA YARIS coolant temperature

5188-2. Steps to take in an emergency
YARIS_HV_OM_Europe_OM52J66E
*4
*5
Low engine oil pressure warning light
Indicates that the engine oil pressure is too low.
 Immediately stop the vehicle in a safe place and con-
tact any authorized Toyota retailer or Toyota autho-
rized repairer, or any reliable repairer.
*4
(Red warning light flashers or comes on)
*5
High engine coolant temperature warning light
Indicates that the engine is overheating.
As the coolant temperature rises, it changes from flashing
to steady on.
 P. 581
*4
Hybrid system warning light (warning buzzer)
Indicates a malfunction in the hybrid system.
 Immediately stop the vehicle in a safe place and con-
tact any authorized Toyota retailer or Toyota autho-
rized repairer, or any reliable repairer.
Malfunction indicator lamp
Indicates a malfunction in:
• The hybrid system;
• The hybrid transmission control system;
• The electronic engine control system;
• The electronic throttle control system; or
• The emission control system.
 Have the vehicle inspected by any authorized Toyota
retailer or Toyota authorized repairer, or any reliable
repairer immediately.
SRS warning light
Indicates a malfunction in:
• The SRS airbag system; or
• The seat belt pretensioner system.
 Have the vehicle inspected by any authorized Toyota
retailer or Toyota authorized repairer, or any reliable
repairer immediately.
Warning lightWarning light/Details/Actions

5818-2. Steps to take in an emergency
8
When trouble arises
YARIS_HV_OM_Europe_OM52J66E
If your vehicle overheats
●Vehicles with monochrome display: The high engine coolant tem-
perature warning light ( P. 518) comes on or flashes, or a loss of
hybrid system power is experienced. (For example, the vehicle
speed does not increase.)
Vehicles with color display:
• The needle of the engine coolant temperature gauge ( P. 1 1 7 )
enters the red zone or a loss of hybrid system power is experi-
enced.
(For example, the vehicle speed does not increase.)
• The warning message indicating overheat is shown on the multi-
information display. ( P. 531)
● Vehicles with monochrome display: If the hybrid system overheat
warning light ( P. 522) comes on.
Vehicles with color display: If the warning message indicating over-
heat is shown on the multi-information display. ( P. 535)
● Steam comes out from under the hood.
The following may indicate that your vehicle is overheating:

5828-2. Steps to take in an emergency
YARIS_HV_OM_Europe_OM52J66E
■If the high engine coolant temperature warning light comes on
or flashes
Stop the vehicle in a safe place and turn off the air conditioning
system, and then stop the hybrid system.
If you see steam:
Carefully lift the hood after the steam subsides.
If you do not see steam:
Carefully lift the hood.
After the hybrid system has
cooled down sufficiently,
inspect the hoses and radia-
tor 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.
The coolant level is satisfac-
tory if it is between the
“FULL” and “LOW” lines on
the reservoir.
Reservoir
“FULL”
“LOW”
Radiator cap
Correction procedures
1
2
3
1
2
4
1
2
3
4

5838-2. Steps to take in an emergency
8
When trouble arises
YARIS_HV_OM_Europe_OM52J66E
Add coolant if necessary.
Water can be used in an emer-
gency if coolant is unavailable.
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 immedi-
ately 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 condi-
tioning system on and off repeatedly.
(The fan may not operate in freezing temperatures.)
If the fan is not operating:
Stop the hybrid system 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.
5
6
7

621Alphabetical index
YARIS_HV_OM_Europe_OM52J66E
Engine coolant ......................... 441
Capacity ................................ 596
Checking ............................... 441
Preparing and checking
before winter....................... 313
Engine coolant temperature
warning light .......................... 518
Engine oil.................................. 438
Capacity ................................ 593
Checking ............................... 438
Oil pressure warning light ..... 518
Oil pressure warning
messages ........................... 531
Preparing and checking
before winter....................... 313
Engine switch................... 216, 220
Auto power off function ......... 225
Changing power switch
positions ............................. 217
Changing the power switch
modes................................. 222
If your vehicle has to
be stopped
in an emergency ................. 507
Starting the hybrid
system ........................ 216, 220
EPS (Electric Power
Steering) ................................. 303
Function ................................ 303
Warning light ......................... 519
EV drive mode .......................... 229
EV indicator ................................ 88
Flat tire.............................. 537, 556
Floor mats .................................. 32
Fluid
Brake .................................... 597
Transmission ........................ 597
Washer ................................. 443
Fog lights ................................. 244
Replacing light bulbs..... 489, 502
Switch ................................... 244
Wattage ................................ 600
Follow me home system ......... 239
Front passenger’s seat belt
reminder light ........................ 521
Front position lights ................ 238
Light switch ........................... 238
Replacing light bulbs..... 492, 502
Wattage ................................ 600
Front seats ............................... 182
Adjustment ............................ 182
Cleaning................................ 419
Correct driving posture ........... 34
Head restraints ..................... 188
Seat heaters ......................... 396
F

631Alphabetical index
YARIS_HV_OM_Europe_OM52J66E
Warning lights .......................... 109
ABS ....................................... 519
Automatic High Beam ........... 520
Brake system ................ 517, 520
Charging system ................... 517
Cruise control indicator ......... 520
Electric power steering
system ................................ 519
Engine coolant
temperature ........................ 518
Engine oil pressure ............... 518
Engine system ...................... 518
Go to service warning ........... 524
High engine coolant
temperature ........................ 518
Hybrid system ....................... 518
Hybrid system overheat ........ 522
LDA
(Lane Departure Alert) ........ 520
Low engine oil pressure ........ 518
Low fuel level ........................ 521
Low traction battery............... 521
Malfunction indicator lamp .... 518
Master warning ..................... 522
Open door ............................. 521
P position request ................. 523
PCS (Pre-Crash Safety
system) ............................... 519
Seat belt reminder light ......... 521
Slip indicator ......................... 520
Smart entry & start
system ........................ 521, 529
SRS....................................... 518
Tire pressure ......................... 522
Warning messages .................. 531
Washer.............................. 246, 250
Checking ............................... 443
Preparing and checking
before winter....................... 313
Switch ........................... 246, 250
Washing and waxing ............... 414
Weight....................................... 590
Wheels ...................................... 470
Replacing .............................. 556
Size ....................................... 598
Window glasses....................... 199
Window lock switch ................ 199
Windows ................................... 199
Power windows ..................... 199
Rear window defogger .......... 390
Washer ......................... 246, 250
Windshield wipers ................... 246
Intermittent windshield
wipers ................................. 246
Rain-sensing windshield
wipers ................................. 247
Winter driving tips ................... 313
Wireless remote control
key .......................................... 141
Battery-saving function ......... 167
Locking/Unlocking................. 141
Replacing the battery ............ 477
WMA disc*............................... 330
*: For vehicles with navigation/multimedia system, refer to
“Navigation and multimedia system Owner’s manual”.