engine overheat TOYOTA PRIUS PLUG-IN HYBRID 2018 Owners Manual

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PRIUS PHV_OM_OM47C99E_(EE)
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7-1. Maintenance and care
Cleaning and protecting
the vehicle exterior ..........572
Cleaning and protecting
the vehicle interior ...........577
7-2. Maintenance
Maintenance
requirements....................583
7-3. Do-it-yourself maintenance
Do-it-yourself service
precautions ......................586
Hood ..................................589
Positioning a floor jack .......591
Engine compartment..........592
Tires ...................................606
Tire inflation pressure ........622
Wheels ...............................624
Replacing the tire ...............627
Air conditioning filter ..........639
Wiper rubber
replacement .....................643
Electronic key battery ........646
Checking and replacing
fuses ................................649
Light bulbs .........................653
8-1. Essential information
Emergency flashers .......... 662
If your vehicle has to
be stopped in an
emergency ...................... 663
8-2. Steps to take in an
emergency
If your vehicle needs
to be towed ..................... 664
If you think something is
wrong .............................. 670
If a warning light turns on
or a warning buzzer
sounds ............................ 671
If a warning message is
displayed ......................... 680
If you have a flat tire .......... 688
If the hybrid system will
not start ........................... 706
If the electronic key does
not operate properly ........ 708
If the 12-volt battery is
discharged ...................... 712
If your vehicle
overheats ........................ 718
If the vehicle becomes
stuck................................ 723
7Maintenance and care8When trouble arises

15Pictorial index
PRIUS PHV_OM_OM47C99E_(EE)Windshield wipers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 376
Precautions against winter season . . . . . . . . . . . . . . . . . . . . . P. 525
Precautions against car wash . . . . . . . . . . . . . . . . . . . . . . . . . P. 574
Fuel filler door . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 379
Refueling method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 379
Fuel type/fuel tank capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 728
Charging port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 121
Charging method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 147
Tires . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 606
Replacing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 627
Tire size/inflation pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 734
Winter tires/tire chain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 525
Checking/rotation/tire pressure warning system . . . . . . . . . . . P. 606
Coping with flat tires . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 688
Hood . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 589
Opening . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 589
Engine oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 730
Coping with overheat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 718
Headlights/front position lights/
daytime running lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 365
Front fog lights/rear fog lights . . . . . . . . . . . . . . . . . . . . . . . P. 375
Turn signal lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 363
Tail lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 365
License plate lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 365
Back-up lights
Shifting the shift position to R . . . . . . . . . . . . . . . . . . . . . . . . . P. 357
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Light bulbs of the exterior lights for driving
(Replacing method: P. 653, Watts: P. 735)
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1152-1. Plug-in hybrid system
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Plug-in hybrid system
PRIUS PHV_OM_OM47C99E_(EE)
NOTICE
■Hybrid battery (traction battery) air vents
● Make sure not to block the air intake vent with anything, such as a seat
cover, plastic cover, or luggage. The hybrid battery (traction battery) may
overheat and be damaged.
● When dust etc. has accumulated in the air intake vent, clean it with a vac-
uum cleaner to prevent the vent from clogging.
● Do not wet or allow foreign substances to enter the air vents as this may
cause a short circuit and damage the hybrid battery (traction battery).
● Do not carry large amounts of water such as water cooler bottles in the
vehicle. If water spills onto the hybrid battery (traction battery), the battery
may be damaged. Have the vehicle inspected by any authorized Toyota
retailer or Toyota authorized repairer, or any reliable repairer.
● A filter is installed to the air intake vent. When the filter remains noticeably
dirty even after cleaning the air intake vent, filter cleaning or replacement
is recommended. When cleaning the filter, refer to P. 578.
■ Notice about fuel
● For plug-in hybrid vehicles, fuel may remain in the tank for a long time and
undergo changes in quality depending on the how the vehicle is used.
Refuel at least 20 L (5.3 gal., 4.4 Imp.gal.) of fuel every 12 months (refuel
a total of at least 20 L [5.3 gal., 4.4 Imp.gal.] over a 12-month period), as
this may affect components of the fuel system or the gasoline engine.
● If the vehicle has not been refueled for a certain amount of time and it is
possible that the quality of the fuel remaining in the tank has changed, “No
new fuel has been added recently. Please refuel” is displayed on the multi-
information display when the power switch is turned to ON mode. If the
message is displayed, refuel the vehicle immediately.

2143. Instrument cluster
PRIUS PHV_OM_OM47C99E_(EE)
WARNING
■If a safety system warning light does not come on
Should a safety system light such as the ABS and SRS warning light not
come on when you start the hybrid system, this could mean that these sys-
tems are not available to help protect you in an accident, which could result
in death or serious injury. Have the vehicle inspected by any authorized
Toyota retailer or Toyota authorized repairer, or any reliable repairer imme-
diately if this occurs.
NOTICE
■ To prevent damage to the engine and its components
The engine may be overheating if the high coolant temperature warning
light comes on or flashes. In this case, immediately stop the vehicle in a
safe place, and check the engine after it has cooled completely. ( P. 718)

3415-1. Before driving
PRIUS PHV_OM_OM47C99E_(EE)
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Driving
WARNING
Observe the following precautions.
Failure to do so may result in death or serious injury.
■ When driving the vehicle
● Use engine braking (shift position B instead of shift position D) to maintain
a safe speed when driving down a steep hill.
Using the brakes continuously may cause the brakes to overheat and lose
effectiveness. ( P. 3 5 8 )
● Do not adjust the positions of the steering wheel, the seat, or the inside or
outside rear view mirrors while driving.
Doing so may result in a loss of vehicle control.
● Always check that all passengers’ arms, heads or other parts of their body
are not outside the vehicle.
■ When driving on slippery road surfaces
● Sudden braking, acceleration and steering may cause tire slippage and
reduce your ability to control the vehicle.
● Sudden acceleration, engine braking due to shifting, or changes in engine
speed could cause the vehicle to skid, resulting in an accident.
● After driving through a puddle, depress the brake pedal to make sure that
the brakes are functioning properly. Wet brake pads may prevent the
brakes from functioning properly. If the brakes on only one side are wet
and not functioning properly, steering control may be affected.

3435-1. Before driving
PRIUS PHV_OM_OM47C99E_(EE)
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Driving
WARNING
Observe the following precautions.
Failure to do so may result in death or serious injury.
■ If you hear a squealing or scraping noise (brake pad wear indicators)
Have the brake pads checked and replaced by any authorized Toyota
retailer or Toyota authorized repairer, or any reliable repairer as soon as
possible.
Rotor damage may result if the pads are not replaced when needed.
It is dangerous to drive the vehicle w hen the wear limits of the brake pads
and/or those of the brake discs are exceeded.
■ When the vehicle is stopped
● Do not depress the accelerator pedal unnecessarily.
If the shift position is in any position other than P or N, the vehicle may
accelerate suddenly and unexpectedly, causing an accident.
● In order to prevent accidents due to the vehicle rolling away, always keep
depressing the brake pedal while stopped with the “READY” indicator is
illuminated, and apply the parking brake as necessary.
● If the vehicle is stopped on an incline, in order to prevent accidents caused
by the vehicle rolling forward or backward, always depress the brake pedal
and securely apply the parking brake as needed.
● Avoid revving or racing the engine.
Running the engine at high speed while the vehicle is stopped may cause
the exhaust system to overheat, which could result in a fire if combustible
material is nearby.

5215-5. Using the driving support systems
PRIUS PHV_OM_OM47C99E_(EE)
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Driving
■Sounds and vibrations caused by the ABS, brake assist, VSC, TRC and
hill-start assist control systems
●A sound may be heard from the engine compartment when the brake pedal
is depressed repeatedly, when the hybrid system is started or just after the
vehicle begins to move. This sound does not indicate that a malfunction has
occurred in any of these systems.
●Any of the following conditions may occur when the above systems are
operating. None of these indicates that a malfunction has occurred.
• Vibrations may be felt through the vehicle body and steering.
• A motor sound may be heard also after the vehicle comes to a stop.
■ECB operating sound
ECB operating sound may be heard in the following cases, but it does not
indicate that a malfunction has occurred.
●Operating sound heard from the engine compartment when the brake pedal
is operated.
●Motor sound of the brake system heard from the front part of the vehicle
when the driver’s door is opened.
●Operating sound heard from the engine compartment when one or two min-
utes passed after the stop of the hybrid system.
■EPS operation sound
When the steering wheel is operated, a motor sound (whirring sound) may be
heard. This does not indicate a malfunction.
■Reduced effectiveness of the EPS system
The effectiveness of the EPS system is reduced to prevent the system from
overheating when there is frequent steering input over an extended period of
time. The steering wheel may feel heavy as a result. Should this occur, refrain
from excessive steering input or stop the vehicle and turn the hybrid system
off. The EPS system should return to normal within 10 minutes.
■Electric power steering system warning light (warning buzzer)
P. 672
■Automatic reactivation of TRC and VSC systems
After turning the TRC and VSC systems off, the systems will be automatically
re-enabled in the following situations:
●When the power switch is turned off
●If only the TRC system is turned off, the TRC will turn on when vehicle
speed increases
If both the TRC and VSC systems are turned off, automatic re-enabling will
not occur when vehicle speed increases.

7218-2. Steps to take in an emergency
PRIUS PHV_OM_OM47C99E_(EE)
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When trouble arises
After stopping the hybrid system and waiting for 5 minutes or
more, start the hybrid system again and check if “Hybrid System
Overheated” is shown on the multi-information display.
If the message does not disappear:
Stop the hybrid system and contact any authorized Toyota
retailer or Toyota authorized 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 autho-
rized Toyota retailer or Toyota authorized repairer, or any reliable
repairer.
WARNING
■ To prevent an accident or injury 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 “Accessory”,
“Ignition ON” or mileage display ( P. 216) on the main display and the
“READY” indicator are off.
When the hybrid system is operating, the gasoline engine may automati-
cally start, or the cooling fans may suddenly operate even if the gasoline
engine stops. Do not touch or approach rotating parts such as the fan,
which may lead to fingers or clothing (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 radi-
ator are hot.
High temperature steam or coolant could spray out.
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757Alphabetical index
PRIUS PHV_OM_OM47C99E_(EE)
Child-protectors ....................... 280
Cleaning............................ 572, 577
Aluminum wheels .................. 573
Camera sensor ..................... 387
Exterior.................................. 572
Interior ................................... 577
Radar sensor ........................ 386
Seat belts .............................. 580
Water-repellent coating ......... 573
Clock ......................................... 198
Adjustment ............................ 204
Coat hooks ............................... 569
Combination meter .................. 198
Clock adjustment .................. 204
Main display .......................... 215
Multi-information display ....... 223
Warning lights and
indicators ............................ 207
Condenser ................................ 598
Console box ............................. 552
Consumption screen ............... 268
Coolant ..................................... 596
Capacity ................................ 732
Checking ............................... 596
Preparing and checking
before winter....................... 525
Cooling system ........................ 596
Engine overheating ............... 718
Hybrid system overheating ... 720
Cruise control .......................... 422
Dynamic radar cruise
control with full-speed
range .................................. 422
Cup holders .............................. 553
Curtain shield airbags ............... 39
Customizable features ............ 738Daytime running light
system .................................... 366
Deck board ............................... 556
Defogger
Outside rear view mirrors...... 535
Rear window ......................... 535
Windshield ............................ 535
Dimension ................................ 726
Display
BSM (Blind Spot Monitor) ..... 442
Drive information................... 225
Dynamic radar cruise
control with full-speed
range .................................. 422
Energy monitor ............. 226, 265
Head-up display .................... 257
Intelligent Clearance
Sonar.................................. 476
LDA (Lane Departure Alert
with steering control) .......... 411
Main display .......................... 215
Multi-information display ....... 223
Pre-crash warning................. 395
RSA (Road Sign Assist)........ 418
S-IPA (Simple Intelligent
Parking Assist System) ...... 487
Toyota parking assist
sensor................................. 460
Warning messages ............... 680
Do-it-yourself maintenance .... 586
Door courtesy lights................ 548
Location ................................ 548
Wattage ................................ 735D

759Alphabetical index
PRIUS PHV_OM_OM47C99E_(EE)
Emergency brake signal ......... 519
Emergency flashers................. 662
Emergency brake signal ....... 519
Emergency tire puncture
repair kit ................................. 688
Energy monitor ................ 226, 265
Engine
Accessory mode ................... 353
Compartment ........................ 592
Engine switch ........................ 351
Exhaust gas precautions......... 50
Hood ..................................... 589
How to start the hybrid
system ................................ 351
Identification number............. 728
If the hybrid system will not
start..................................... 706
If your vehicle has to be
stopped in an emergency ... 663
Ignition switch
(power switch) .................... 351
Overheating .......................... 718
Power switch ......................... 351Engine coolant ......................... 596
Capacity ................................ 732
Checking ............................... 596
Preparing and checking
before winter....................... 525
Engine oil ................................. 593
Capacity ................................ 730
Checking ............................... 593
Oil pressure warning light ..... 672
Preparing and checking
before winter....................... 525
Engine switch .......................... 351
Auto power off function ......... 353
Changing the power switch
modes................................. 353
If your vehicle has to be
stopped in an emergency ... 663
Starting the hybrid system .... 351
EPS (Electronic Power
Steering)................................. 519
Function ................................ 519
Warning light ......................... 672
EV City mode switch ............... 100
EV driving range ...................... 119
EV mode ..................................... 97
EV/HV mode selection
switch ..................................... 100
Exhaust gas precautions .......... 50