engine overheat TOYOTA PRIUS 2012 3.G Owners Manual

1
2
3
4
5
6
7
5
4-1. Maintenance and careCleaning and protecting the vehicle exterior............ 396
Cleaning and protecting the vehicle interior............. 399
4-2. Maintenance Maintenance requirements ..................... 402
General maintenance.......... 405
Emission inspection and maintenance (I/M)
programs........................... 409
4-3. Do-it-yourself maintenance Do-it-yourself service precautions ....................... 410
Hood ................................... 413
Positioning a floor jack ........ 416
Engine compartment ........... 419
12-volt battery ..................... 431
Tires .................................... 437
Tire inflation pressure ......... 447
Wheels ................................ 451
Electronic key battery.......... 454
Checking and replacing fuses ................................. 456
Light bulbs........................... 467 5-1. Essential information
Emergency flashers............ 484
If your vehicle needs to be towed........................... 485
If you think something is wrong ............................ 492
5-2. Steps to take in an emergency If a warning light turns on or a warning buzzer
sounds.............................. 493
If a warning message is displayed ...................... 507
If you have a flat tire ........... 523
If the hybrid system will not start ............................ 538
If you lose your keys........... 540
If the electronic key does not operate properly ......... 541
If the 12-volt battery is discharged........................ 543
If your vehicle overheats .... 549
If the vehicle becomes stuck ................................. 554
If your vehicle has to be stopped in an
emergency ....................... 556
4Maintenance and care5When trouble arises

184 2-1. Driving procedures
CAUTION
●If the smell of exhaust is noticed inside the vehicle, open the windows and
check that the back door is closed. Large amounts of exhaust in the vehi-
cle can cause driver drowsiness and an accident, resulting in death or a
serious health hazard. Have the vehicle inspected by your Toyota dealer
immediately.
● Do not shift the shift position to P while the vehicle is moving.
Doing so can damage the transmission and may result in a loss of vehicle\
control.
● Do not shift the shift position to R while the vehicle is moving forward.
Doing so can damage the transmission and may result in a loss of vehicle\
control.
● Do not shift the shift position to D while the vehicle is moving backward.
Doing so can damage the transmission and may result in a loss of vehicle\
control.
● Moving the shift position to N while the vehicle is moving will disengage
the hybrid system. Engine braking is not available with the hybrid system
disengaged.
● During normal driving, do not turn off the hybrid system. Turning the hybrid
system off while driving will not cause loss of steering or braking control,
but the power assist to these systems will be lost. This will make it more
difficult to steer and brake, so you should pull over and stop the vehicle as
soon as it is safe to do so.
However, in the event of an emergency, such as if it becomes impossible
to stop the vehicle in the normal way: P. 556
● 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. 202)

187
2-1. Driving procedures
2
When driving
CAUTION
●
If the vehicle is stopped on an incline, in order to prevent accidents caused
by the vehicle rolling forward or ba ckward, 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.
■ When the vehicle is parked
●Make sure to firmly apply the parking brake and shift the shift position to P.
Failure to do so may cause the vehicle to move, or the vehicle to acceler-
ate suddenly if the accelerator pedal is accidentally depressed. Also, when
leaving the vehicle, make sure to turn off the hybrid system and lock the
vehicle.
Sound or shuddering may not be noticed even when the hybrid vehicle is
ready to drive (when the “READY ” indicator is illuminated).
● Do not leave glasses, cigarette lighters, spray cans, or soft drink cans in
the vehicle when it is in the sun.
Doing so may result in the following:
• Gas may leak from a cigarette lighter or spray can, and may lead to a
fire.
• The temperature inside the vehicle may cause the plastic lenses and plastic material of glasses to deform or crack.
• Soft drink cans may fracture, causing the contents to spray over the interior of the vehicle, and may also cause a short circuit in the vehi-
cle’s electrical components.

218 2-2. Instrument cluster
CAUTION
■To prevent an accident
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. 549)
Do not place anything or attach a sticker
in front of the instrument cluster. The item
may obscure or obstruct the display, or
could reflect off the display, possibly
causing an accident.Instrument cluster

298 2-4. Using other driving systems
■Sounds and vibrations caused by the ABS, brake assist, VSC and
TRAC
● A sound may be heard from the engine compartment when the hybrid
system is started, just after the vehicle begins to move, if the brake pedal
is depressed forcefully or repeatedly, or 1-2 minutes after the hybrid sys-
tem is stopped. 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 after the vehicle comes to a stop.
• The brake pedal may pulsate slightly after the ABS is activated.
• The brake pedal may move down slightly after the ABS is activated.
■ 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. 501

5
When trouble arises
549
5-2. Steps to take in an emergency
If your vehicle overheats
Correction procedures■ If the high coolant temperature warning light flashes or comes
on
Stop the vehicle in a safe place and turn off the air condition-
ing system.
Check to see if steam is coming out from under the hood.
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.
The following may indicate that your vehicle is overheating:
●The high coolant temperature warn ing light flashes or comes on:
The engine may be overheating.
● “HYBRID SYSTEM OVERHEAT” is shown on the multi-informa-
tion display:
The power control unit may be overheating.
Follow the correction procedure as described below.
STEP 1
STEP 2

620 Alphabetical index
Child safetyAirbag precautions ................148
Back door precautions ............95
Child restraint system............ 160
Child-protectors .......................88
How your child should wear
the seat belt ........................ 111
Installing child restraints ........ 165
Power window lock switch..... 123
Power window precautions ... 125
Removed electronic key battery
precautions ......................... 455
Seat belt extender precautions ......................... 116
Seat belt precautions ............ 112
Seat heater precautions ........ 370
12-volt battery precautions .... 434
Child-protectors .........................88
Cleaning Exterior .................................. 396
Interior ................................... 399
Seat belts .............................. 400
Clock ......................................... 230
Condenser ................................ 426
Console box ............................. 359
Cooling system
Engine overheating ............... 549
Hybrid system overheating.... 549
Cruise control
Cruise control ........................ 266
Dynamic radar cruise control ................................. 270
Cup holders .............................. 360
Curtain shield airbags ............. 140
Customizable features............. 590 Daytime running light
system .................................... 253
Deck board ............................... 374
Defogger Rear window ......................... 346
Side mirrors........................... 346
Dimensions .............................. 560
Dinghy towing .......................... 323
Display Dynamic radar cruise control ................................. 270
Multi-information ................... 223
Warning messages ............... 507
Do-it-yourself maintenance .... 410
Door lock
Back door ................................ 93
Side doors ............................... 87
Smart key system .. ................. 61
Wireless remote control .......... 85
Doors
Back door ................................ 93
Door glasses ......................... 123
Door lock ..................... 61, 85, 87
Rear door child-protector ........ 88
Side doors ............................... 87
Driver’s seat belt reminder
light ......................................... 498
Driving Break-in tips .......................... 181
Correct posture ..................... 138
Procedures............................ 180
Winter driving tips ................. 317D

621
Alphabetical index
Eco drive mode switch ........... 204
Electric power steering........... 296
Electronic key
If the electronic key does not operate properly ................. 541
Replacing battery ................. 454
Emergency, in case of If a warning buzzer
sounds ............................... 493
If a warning light turns on ..... 493
If the electronic key does not operate properly ................. 541
If the hybrid system will not start .................................... 538
If the 12-volt battery is discharged ......................... 543
If you have a flat tire ............ 523
If you lose your keys............. 540
If you think something is wrong ................................. 492
If your vehicle becomes stuck................................... 554
If your vehicle has to be
stopped in an
emergency ......................... 556
If your vehicle needs to be
towed ................................. 485
If your vehicle overheats ...... 549
Emergency flashers
Switch ................................... 484 Engine
Accessory mode....................194
Compartment ........................419
Hood......................................413
How to start the hybrid
system ................................192
Identification number .............561
If the hybrid system will not start .....................................538
Ignition switch........................192
Overheating...........................549
“POWER” switch ...................192
Engine coolant Capacity ................................566
Checking ...............................424
Preparing and checking before winter .......................317
Engine/power control unit coolantCapacity ................................566
Checking ...............................424
Preparing and checking before winter .......................317
Engine oil Capacity ................................563
Checking ...............................420
Preparing and checking before winter .......................317
Enhanced VSC .........................296
EPS ............................................296
EV drive mode switch ..............199
Event data recorder ...................25E

624 Alphabetical index
MaintenanceDo-it-yourself
maintenance ....................... 410
General maintenance ............ 405
Maintenance data.................. 560
Maintenance requirements.... 402
Maintenance data ..................... 403
Meter Instrument panel light control ................................. 217
Meters ................................... 214
Speed unit select button........ 216
Trip information display ......... 229
Micro dust and pollen filter ..... 330
Microphone
*............................ 388
Mirrors Inside rear view mirror........... 118
Side mirror heater ................. 346
Side mirrors ........................... 121
Vanity mirrors ........................ 365
MP3 disc
*
Multi-information display ........ 223
Navigation system (refer to “Navigation
System Owner’s Manual”)
Noise from under vehicle ..........22
Odometer .................................. 214
Oil Engine oil .............................. 420
Opener Back door ................................93
Fuel filler door ....................... 131
Hood...................................... 413
Outside rear view mirrors
Adjusting and folding ............. 121
Outside rear view mirror defogger switch ..................... 346 Outside temperature
display .................................... 366
Overheating .............................. 549
Parking brake ........................... 212
Parking lights Switch ................................... 250
PCS ........................................... 303
Personal lights Switch ................................... 355
Wattage................................. 570
Power outlets ........................... 367
“POWER” switch ..................... 192
Power windows ........................ 123
Pre-collision system ................ 303
Radar cruise control system .................................... 270
Radiator .................................... 426
Radio
*
Radio data system*
RDS*
Rear seats Adjustment ............................ 102
Folding down......................... 103
Rear turn signal lights Replacing light bulbs ............. 467
Wattage................................. 570
Rear view mirror .............. 118, 121
Rear view monitor system
*
Rear window and outside rear view mirror
defoggers ............................... 346
Rear window wiper and washer .................................... 262
Remote Air C onditioning
System.................................... 342
M
N
O
P
R