2012 TOYOTA PRIUS Temperature

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

550 5-2. Steps to take in an emergency
Check to see if the cooling fans are operating.
If the fans are operating: Wait until the high coolant temperature warning light goes
off and then stop the hybrid system.
If the fans are not operating: Stop the hybrid system immediately and call your Toyota
dealer.
After the hybrid system has
cooled down sufficiently, check
the engine coolant level and
inspect the cooling system for
leaks.
If necessary, add engine coolant
up to the “FULL” line.
Water can be used in an emer-
gency measure if engine coolant
is unavailable. (P. 566)
Have the vehicle checked at nearest Toyota dealer as soon as possi-
ble.
STEP 3
STEP 4
ITO52P130
STEP 5

564 6-1. Specifications
■Engine oil selection
“Toyota Genuine Motor Oil” is used in your Toyota vehicle. Use
Toyota approved “Toyota Genuine Motor Oil” or equivalent to satisfy
the following grade and viscosity.
Oil grade: ILSAC multigrade engine oil
Recommended viscosity: SAE 0W-20
SAE 0W-20 is the good choice
for good fuel economy and good
starting in cold weather.
If SAE 0W-20 is not available,
SAE 5W-20 oil may be used.
However, it must be replaced
with SAE 0W-20 at the next oil
change.
Oil viscosity (0W-20 is explained here as an example):
• The 0W in 0W-20 indicates the characteristic of the oil which allowscold startability. Oils with a lower value before the W allow for easier
starting of the engine in cold weather.
• The 20 in 0W-20 indicates the viscosity characteristic of the oil when
the oil is at high temperature. An oil with a higher viscosity (one with a
higher value) may be better suited if the vehicle is operated at high
speeds, or under extreme load conditions.
Outside temperature

580 6-1. Specifications
Uniform Tire Quality GradingThis information has been prepared in accordance with regulations
issued by the National Highway Tr affic Safety Administration of the
U.S. Department of Transportation.
It provides the purchasers and/or prospective purchasers of Toyota
vehicles with information on uniform tire quality grading.
Your Toyota dealer will help answ er any questions you may have as
you read this information.
■ DOT quality grades
All passenger vehicle tires mu st conform to Federal Safety
Requirements in addition to these grades. Quality grades can be
found where applicable on the tire sidewall between tread shoulder
and maximum section width.
For example: Treadwear 200 Traction AA Temperature A
■ Treadwear
The treadwear grade is a comparative rating based on the wear
rate of the tire when tested under controlled conditions on a speci-
fied government test course.
For example, a tire graded 150 would wear one and a half (1 - 1/2)
times as well on the government course as a tire graded 100.
The relative performance of tires depends upon the actual conditions
of their use. Performance may diff er significantly from the norm due
to variations in driving habits, service practices and differences in
road characteristics and climate.

581
6-1. Specifications
6
Vehicle specifications
■
Traction AA, A, B, C
The traction grades, from highest to lowest, are AA, A, B and C,
and they represent the tire’s ab ility to stop on wet pavement as
measured under controlled cond itions on specified government
test surfaces of asphalt and concrete.
A tire marked C may have poor traction performance.
Warning: The traction grade assigned to this tire is based on braking
(straight ahead) traction tests and does not include cornering (turn-
ing) traction.
■ Temperature A, B, C
The temperature grades are A (the highest), B, and C, represent-
ing the tire’s resistance to the generation of heat and its ability to
dissipate heat when tested under controlled conditions on a speci-
fied indoor laboratory test wheel.
Sustained high temperature can cause the material of the tire to
degenerate and reduce tire life, and excessive temperature can lead
to sudden tire failure.
Grade C corresponds to a level of performance which all passenger
car tires must meet under the Federal Motor Vehicle Safety Standard
No. 109.
Grades B and A represent higher levels of performance on the labo-
ratory test wheel than the minimum required by law.
Warning: The temperature grades of a tire assume that it is properly
inflated and not overloaded.
Excessive speed, underinflation, or excessive loading, either sepa-
rately or in combination, can caus e heat buildup and possible tire fail-
ure.

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

627
Alphabetical index
Tonneau cover......................... 377
Tools......................................... 523
Touch tracer display ............... 215
Total load capacity .................. 316
Towing
Dinghy towing ....................... 323
Emergency towing ................ 486
Trailer towing ........................ 322
TRAC ........................................ 296
Traction control ....................... 296
Trailer towing........................... 322
Transmission Hybrid transmission .............. 202
P position switch................... 205
Trip information....................... 229
Trip meter................................. 214
Turn signal lights Replacing light bulbs ............ 467
Switch ................................... 211
Wattage ................................ 570
USB port
*................................ 352
Vanity lights Vanity lights .......................... 365
Wattage ................................ 570
Vanity mirrors .......................... 365
Vehicle control and operation
data recording ......................... 24
Vehicle identification
number................................... 561
Vehicle proximity notification system ..................................... 32
Vehicle stability control .......... 296
VSC ........................................... 296 Warning buzzers
Brake system ........................493
Open door ............................498
Seat belt reminder .................498
Warning lights
Anti-lock brake system (ABS) ..................................495
Automatic headlight leveling
system ................................497
Brake system ................493, 496
Charging system .... ...............494
Cruise control ........................497
Electric power steering system ................................495
High coolant temperature ......494
Hybrid system .......................495
Low fuel level ........................498
Low tire pressure...................499
Malfunction indicator lamp ....495
Open door .............................498
Pre-collision system ..............496
Radar cruise control. .............497
Seat belt warning light ...........498
Slip indicator..........................496
SRS airbags ..........................495
Tire pressure warning light ....499U
V
W
GW Refer to

630
What to do if...
What to do if...
A tire puncturesP. 523If you have a flat tire
The hybrid system does not start
P. 538If the hybrid system will not start
P. 135Immobilizer system
P. 543If the 12-volt battery is
discharged
The high coolant temperature
warning light flashes or comes on
“HYBRID SYSTEM OVERHEAT”
is displayed
Steam can be seen coming
from under the hood
P. 549If your vehicle overheats
The key is lostP. 540If you lose your keys
The 12-volt battery runs outP. 543If the 12-volt battery is
discharged
The doors cannot be lockedP. 8 7Side doors
P. 9 3Back door
The vehicle is stuck in mud or
sandP. 554If the vehicle becomes stuck
A warning light or indicator
light comes onP. 493If a warning light turns on or a
warning buzzer sounds