2012 TOYOTA YARIS HYBRID coolant temperature

480 4-3. Do-it-yourself maintenance
YARIS_F (including HV)_WE_52C79E
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.
“Toyota Super Long Life Coolant” is a mixture of 50% coolant and 50%
deionized water. (Minimum temperature: -35C [-31F])
For more details about engine coolant, contact any authorized Toyota dealer
or repairer, or another duly qualified and equipped professional.
If the coolant level drops within a short time of replenishing
Except hybrid vehicle: Visually check the radiator, hoses, engine coolant res-
ervoir cap, drain cock and water pump.
Hybrid vehicle: Visually check the radiator, hoses, engine/power control unit
coolant reservoir caps, drain cock and water pump.
If you cannot find a leak, have any authorized Toyota dealer or repairer, or
another duly qualified and equipped professional, test the cap and check for
leaks in the cooling system.
CAUTION
When the engine is hot (except hybrid vehicle)
Do not remove the radiator cap (gasoline engine), or the engine coolant res-
ervoir cap (diesel engine).
The cooling system may be under pressure and may spray hot coolant if the
cap is removed, causing serious injuries, such as burns.
When the hybrid system is hot (hybrid vehicle)
Do not remove the engine/power control unit coolant reservoir caps.
The cooling system may be under pressure and may spray hot coolant if the
cap is removed, causing serious injuries, such as burns.

5
563
5-1. Essential information
When trouble arises
YARIS_F (including HV)_WE_52C79E
If you think something is wrong
If you notice any of the following symptoms, your vehicle probably
needs adjustment or repair. Contact any authorized Toyota dealer or
repairer, or another duly qualified and equipped professional as
soon as possible.
Visible symptoms
Fluid leaks under the vehicle
(Water dripping from the air conditioning after use is normal.)
Flat-looking tires or uneven tire wear
High engine coolant temperature warning light flashes or
comes on
Except hybrid vehicle: Low engine coolant temperature indi-
cator comes on or does not come on continuously
Audible symptoms
Changes in exhaust sound
Excessive tire squeal when cornering
Strange noises related to the suspension system
Except hybrid vehicle: Pinging or other noises related to the
engine
Hybrid vehicle: Pinging or other noises related to the hybrid
system
Operational symptoms
Engine missing, stumbling or running roughly
Appreciable loss of power
Vehicle pulls heavily to one side when braking
Vehicle pulls heavily to one side when driving on a level road
Loss of brake effectiveness, spongy feeling, pedal almost
touches the floor

566 5-2. Steps to take in an emergency
YARIS_F (including HV)_WE_52C79E
Stop the vehicle immediately.
The following warnings indicate the possibility of damage to the
vehicle that may lead to an accident. Immediately stop the vehicle
in a safe place and contact any authorized Toyota dealer or
repairer, or another duly qualified and equipped professional.
Warning lightWarning light/Details
Charging system warning light
Indicates a malfunction in the vehicle’s charging system.
Low engine oil pressure warning light
Indicates that the engine oil pressure is too low.
(Flashes or
comes on)High engine coolant temperature warning light
Indicates that the engine is overheating. (P. 635, 639)
• Flashes: Engine is overheating. Drive carefully.
• Comes on: Engine is overheated. Stop the vehicle.
Hybrid system warning light and warning buzzer
(hybrid vehicle)
Indicates a malfunction in the hybrid system.

5
635
5-2. Steps to take in an emergency
When trouble arises
YARIS_F (including HV)_WE_52C79E
If your vehicle overheats (except hybrid vehicle)
If your engine overheats:
Stop the vehicle in a safe place and turn off the air condi-
tioning system.
Check to see if steam is coming out from under the hood.
If you see steam:
Stop the engine. Carefully lift the hood after the steam sub-
sides and then restart the engine.
If you do not see steam:
Leave the engine running and carefully lift the hood.
Check to see if the cooling fan is operating.
If the fan is operating:
Wait until the high engine coolant temperature warning light
goes off and then stop the engine.
If the fan is not operating:
Stop the engine immediately and call any authorized Toyota
dealer or repairer, or another duly qualified and equipped
professional.
After the engine has cooled down sufficiently, check the
engine coolant level and inspect the radiator core (radiator)
for any leaks.
Gasoline engine

5
637 5-2. Steps to take in an emergency
When trouble arises
YARIS_F (including HV)_WE_52C79E
Overheating
If you observe the following, your vehicle may be overheating:
The high engine coolant temperature warning light flashes or comes on
or a loss of power is experienced.
Steam comes out from under the hood.
CAUTION
To prevent an accident or injury when inspecting under the hood of
your vehicle
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, caus-
ing serious injuries such as burns.
Keep hands and clothing away from the fan and drive belt while the engine
is running.
Do not loosen the radiator cap, or the coolant reservoir cap while the
engine and radiator are hot.
Serious injury, such as burns, may result from hot coolant and steam
released under pressure.
Diesel engine
Have the vehicle inspected at the nearest authorized Toyota dealer
or repairer, or another duly qualified and equipped professional as
soon as possible.

5
639
5-2. Steps to take in an emergency
When trouble arises
YARIS_F (including HV)_WE_52C79E
If your vehicle overheats (hybrid vehicle)
Correction procedures
If the high engine coolant temperature warning light comes on
or flashes
Stop the vehicle in a safe place and turn off the air condition-
ing system.
Check to see if steam is coming out from the engine area.
If you see steam:
Stop the hybrid system. Carefully lift the hood after the steam
subsides and then restart the hybrid system.
If you do not see steam:
Leave the hybrid system operating and carefully lift the hood.
Check to see if the cooling fan is operating.
If the fan is operating:
Wait until the high engine coolant temperature warning light
goes off and then stop the hybrid system.
If the fan is not operating:
Stop the hybrid system immediately and call any authorized
Toyota dealer or repairer, or another duly qualified and
equipped professional.
The following may indicate that your vehicle is overheating:
The high engine coolant temperature warning light comes on or
flashes:
The engine may be overheating.
If the hybrid system overheat warning light comes on:
The power control unit may be overheating.
Follow the correction procedure as described below.

696 Alphabetical index
YARIS_F (including HV)_WE_52C79E
Tachometer .............................. 273
Tail lights
Replacing light bulbs ............. 535
Switch ................................... 293
Wattage................................. 677
Telephone switch*
Theft deterrent system
Double locking system .......... 162
Engine immobilizer system ... 155
Immobilizer system ............... 155
Tire inflation pressure ............. 498
Tires
Chains ................................... 338
Checking ............................... 494
If you have a flat tire...... 582, 594
Inflation pressure .......... 498, 672
Replacing .............................. 582
Rotating tires ......................... 494
Size ....................................... 672
Snow tires ............................. 338
Spare tire .............................. 582
Tools ................................. 582, 595
Total load capacity .................. 654
Towing
Emergency towing ................ 554
Trailer towing ................ 342, 343
Traction control ....................... 326
Transmission shift
switches ......................... 261, 262
TRC ........................................... 326
Trip information ....................... 286
Trip meter ................................. 273
Turn signal lights
Replacing light bulbs ............. 535
Switch ................................... 269
Wattage................................. 677Vanity lights
Vanity lights .......................... 426
Wattage ................................ 677
Vanity mirrors .......................... 426
Vehicle identification
number ................................... 656
Vehicle stability control .......... 326
VSC ........................................... 326
Warning buzzers
Brake system ........................ 565
Clutch.................................... 566
Electric power steering
system ................................ 568
Hybrid system ....................... 566
Hybrid system overheat ........ 570
Multi-mode manual
transmission ....................... 566
P position request
indicator light ...................... 570
Seat belt reminder ................ 570
Warning lights
Anti-lock brake system.......... 568
Brake assist system .............. 568
Brake system ........................ 565
Charging system ................... 566
Clutch.................................... 566
Cruise control indicator
light ..................................... 568
DPF system .......................... 570
Electric power steering ......... 568
Electronic engine control
system ................................ 568
Engine oil maintenance ........ 570
Fuel filter ............................... 568
High engine coolant
temperature ........................ 566
Hybrid system ....................... 566
Hybrid system overheat ........ 570
Low engine oil level .............. 570
Low engine oil pressure ........ 566TV
W

698
YARIS_F (including HV)_WE_52C79E
What to do if...
What to do if...
A tire puncturesP. 582
P. 594If you have a flat tire
The engine does not start
(except hybrid vehicle)
P. 6 1 1If the engine will not start
P. 644If you run out of fuel and the
engine stalls (diesel engine only)
P. 155Engine immobilizer system
P. 624If the vehicle battery is discharged
P. 619If the electronic key does not
operate properly
The hybrid system does not start
(hybrid vehicle)
P. 614If the hybrid system will not start
P. 155Immobilizer system
P. 631If the vehicle’s 12-volt battery is discharged
P. 619If the electronic key does not
operate properly
The shift lever cannot be
moved outP. 616If the shift lever cannot be shifted from P
P. 617If the shift lever cannot be shifted
The high engine coolant temperature
warning light flashes or comes on
Steam can be seen coming
from under the hood
P. 635If your vehicle overheats
(except hybrid vehicle)
The high engine coolant temperature
warning light flashes or comes on
The hybrid system overheat warning
light comes on
Steam can be seen coming
from under the hood
P. 639If your vehicle overheats
(hybrid vehicle)