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297
4-3. Do-it-yourself maintenance
4
Maintenance and care
■
If the coolant level drops within a short time after replenishing
Visually check the radiator, hoses, coolant reservoir caps, radiator cap, drain
cock and water pump.
If you cannot find a leak, have your Toyota dealer test the cap and check for
leaks in the cooling system.
■ Coolant selection
Only use “Toyota Super Long Life Coolant” or similar high quality ethylene
glycol based non-silicate, non-amine, non-nitrite, and non-borate coolant
with long-life hybrid organic acid technology.
U.S.A.: Toyota Super Long Life Coolant is a mixture of 50% coolant and 50% deionized water. (Enabled: -31 °F [-35° C])
Canada: Toyota Super Long Life Coolant is a mixture of 55% coolant and 45% deionized water. (Enabled: -44 °F [-42° C])
For more details about coolant, contact your Toyota dealer.
CAUTION
■ When the hybrid system is hot
Do not remove the coolant reservoir cap.
The cooling system may be under pressure and may spray hot coolant if the
cap is removed, causing burns or other injuries.
NOTICE
■When adding coolant
Coolant is neither plain water nor straight antifreeze. The correct mixture of
water and antifreeze must be used to provide proper lubrication, corrosion
protection and cooling. Be sure to read the antifreeze or coolant label.
■ If you spill coolant
Be sure to wash it off with water to prevent damage to parts or paint.
Page 345 of 444
5
When trouble arises
345
5-1. Essential information
If you think something is wrong
If you notice any of the following symptoms, your vehicle probably
needs adjustment or repair. Contact your Toyota dealer as soon as
possible.
■ Visible symptoms
●Fluid leaks under the vehicle
(Water dripping from the air cond itioning after use is normal.)
● Flat-looking tires or uneven tire wear
● Engine coolant temperature ga uge needle continually points
higher than normal
■ Audible symptoms
●Changes in exhaust sound
● Excessive tire squeal when cornering
● Strange noises related to the suspension system
● Pinging or other noises related to the hybrid system
■ Operational symptoms
●Engine missing, stumbling or running rough
● 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, s pongy feeling, pedal almost
touches the floor
Page 358 of 444
358 5-2. Steps to take in an emergency
Stop the vehicle immediately.● The following warning indicates the possibility of damage to the
vehicle that may lead to an acci dent. Immediately stop the vehicle
in a safe place and cont act your Toyota dealer.
● The following warning indicates the possibility of damage to the
vehicle that may lead to an acci dent. Immediately stop the vehicle
in a safe place and allow the engine to cool.
Warning messageDetails
Indicates an abnormal engine oil pressure.
A buzzer also sounds.
The warning light may turn on if the engine oil
pressure is too low.
Indicates a malfunction in the hybrid system.
A buzzer also sounds.
Warning messageDetails
Indicates that the engine coolant temperature is
too high.
A buzzer also sounds.
Page 359 of 444
5
When trouble arises
359
5-2. Steps to take in an emergency
●
The following warning indicates the possibility of damage to the
vehicle that may lead to an accide nt. Immediately stop the vehicle
in a safe place and allow the power control unit and electric motor
(traction motor) to cool.
Have the vehicle inspected immediately.
Failing to investigate the cause of the following warnings may lead to
the system operating abnormally and possibly cause an accident.
Have the vehicle inspected by your Toyota dealer immediately.
Warning messageDetails
Indicates that the temp
erature for the power
control unit coolant or electric motor (traction
motor) is too high. A buzzer also sounds.
Warning messageDetails
Indicates a malfunction in the steering lock sys-
tem.
A buzzer also sounds.
Indicates a malfunction in the TRAC and VSC
systems.
A buzzer also sounds.
Page 390 of 444
390 5-2. Steps to take in an emergency
After the hybrid system has
cooled down sufficiently, check
the engine coolant level and
inspect the radiator core (radia-
tor) for any leaks.
Add engine coolant if necessary.
Water can be used in an emer-
gency if engine coolant is unavail-
able.
(→P. 401)
■ If “HYBRID SYSTEM OVER HEAT” is shown on the multi-infor-
mation display
Stop the vehicle in a safe plac e and turn off the air condition-
ing system.
Leave the hybrid system operating and carefully lift the hood.
Check if the cooling fans are operating.
If the fans are operating: Wait until “HYBRID SYSTEM OVER HEAT” disappears and
then stop the hybrid system.
If the message does not disapp ear, call your Toyota dealer.
If the fans are not operating: Stop the hybrid system immediately and call your local
Toyota dealer.
STEP4
STEP5
STEP1
STEP2
STEP3
Page 391 of 444
5
When trouble arises
391
5-2. Steps to take in an emergency
After the hybrid system has
cooled down, check the power
control unit coolant level and
inspect the cooling system for
leaks.
Add power control unit coolant if
necessary.
Water can be used in an emer-
gency if power control unit cool-
ant is unavailable. (
→P. 401)
Have the vehicle checked at the nearest Toyota dealer as soon as
possible.
STEP4
STEP5
■Overheating
The following symptoms may occur when your vehicle is overheating:
●Hybrid system output decreases.
● Steam is coming from the engine area.
Page 392 of 444

392 5-2. Steps to take in an emergency
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 injury such as burns.
● With a hybrid vehicle, there are times when the gasoline engine automati-
cally starts to run or the cooling fans suddenly start to operate. Do not
touch or approach the rotating parts of the belt or fans. Doing so may lead
to fingers, clothes or tools getting caught, resulting in an accidental injury.
● Do not loosen the coolant reservoir cap while the hybrid system and radia-
tor are hot.
Serious injury, such as burns, may result from hot coolant and steam
released under pressure.
NOTICE
■When adding engine/power control unit coolant
Wait until the hybrid system has cooled down before adding engine/power
control unit coolant.
When adding coolant, do so slowly. Adding cool coolant to a hot hybrid sys-
tem too quickly can cause damage to the hybrid system.
Page 401 of 444
401
6-1. Specifications
6
Vehicle specifications
Cooling system
Ignition system
Gasoline engine
Power control
unit
6.6 qt. (6.2 L, 5.5 Imp.qt.)
3.1 qt. (2.9 L, 2.6 Imp.qt.)
Coolant typeUse either of the following.
• “Toyota Super Long Life Coolant”
• Similar high-quality ethylene glycol-based non-silicate, non-amine, non-nitrite, and non-borate coolant with
long-life hybrid organic acid technology
Do not use plain water alone.
Spark plug
Make
Gap DENSO SK20R11
NGK IFR6A11
0.043 in. (1.1 mm)
NOTICE
■
Iridium-tipped spark plugs
Use only iridium-tipped spark plugs. Do not adjust spark plug gap.