2010 TOYOTA PRIUS coolant

5
When trouble arises
551
5-2. Steps to take in an emergency
PRIUS_U (OM47668U) U.S.A.
If necessary, add power control
unit coolant up to the full line.
Water can be used in an emer-
gency measure if power control
unit coolant is unavailable.

( P. 562)
Have the vehicle checked at nearest Toyota dealer as soon as possi-
ble.
STEP5
■ Overheating
The following symptoms may occur when your vehicle is overheating:
● Hybrid system output decrease.
● Steam is coming from under the hood.

552 5-2. Steps to take in an emergency
PRIUS_U (OM47668U) U.S.A.
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.

562 6-1. Specifications
PRIUS_U (OM47668U) U.S.A.
Cooling system
Ignition system
Capacity
Gasoline engine
With an exhaust
heat recovery sys-
tem
Without exhaust
heat recovery sys-
tem
Power control unit7.6 qt. (7.2 L, 6.3 Imp.qt.)
6.9 qt. (6.5 L, 5.7 Imp.qt.)
2.1 qt. (2.0 L, 1.8 Imp.qt.)
Coolant type
Use 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 technol-
ogy
Do not use plain water alone.
Spark plug
Make DENSO SC20HR11
Gap 0.043 in. (1.1 mm)
NOTICE
■Iridium-tipped spark plugs
Use only iridium-tipped spark plugs. Do not adjust gap when tuning engine.

579
6-1. Specifications
6
Vehicle specifications
PRIUS_U (OM47668U) U.S.A.
Glossary of tire terminology
Tire related termMeaning
Cold tire inflation 
pressure Tire pressure when the vehicle has been
parked for three hours or more, or has not
been driven more than 1 mile or 1.5 km under
that condition
Maximum inflation
pressure The maximum cold inflated
pressure to which a
tire may be inflated, s hown on the sidewall of
the tire
Recommended 
inflation pressure Cold tire inflation pressure recommended by a
manufacturer.
Accessory weight The combined weight (in excess of those stan-
dard items which may be replaced) of trans-
mission, power steering, power brakes, power
windows, power seats, radio and heater, to the
extent that these items
are available as factory-
installed equipment (whether installed or not)
Curb weight The weight of a motor vehicle with standard
equipment, including the maximum capacity of
fuel, oil and coolant, and if so equipped, air
conditioning and additional weight optional
engine
Maximum loaded 
vehicle weight The sum of:

(a) Curb weight 
(b) Accessory weight 
(c) Vehicle capacity weight 
(d) Production options weight

603
Alphabetical index
PRIUS_U (OM47668U) U.S.A.
Driver’s seat belt reminder

light ........................................ 499
Driving
Break-in tips ......................... 151
Correct posture..................... 111
Procedures ........................... 150
Winter driving tips ................. 261
Electric Power Steering .......... 245
Electronic key Replacing battery ................. 460
When the electronic key 
battery is discharged .......... 541
Emergency flashers ............... 486
Emergency, in case of
If a warning buzzer 
sounds ............................... 496
If a warning light turns on ..... 496
If a warning message 
is displayed ........................ 508
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 ............ 524
If you lose your keys............. 540
If you think something is 
wrong ................................. 493
If your vehicle becomes 
stuck................................... 553
If your vehicle needs to be 
towed ................................. 487
If your vehicle overheats ...... 548 Engine
Compartment ........................425
Hood......................................420
How to start the hybrid 
system ................................162
If the hybrid system will 
not start ...............................538
Ignition switch........................162
Overheating...........................548
“POWER” switch ...................162
Engine oil Capacity ................................560
Checking ...............................426
Preparing and checking 
before winter .......................261
Engine/power control unit coolant Capacity ................................562
Checking ...............................430
Preparing and checking 
before winter .......................261
Engine oil maintenance 
data .........................................428
Enhanced VSC (Vehicle 
Stability Control)....................245
EPS ............................................245
Event data recorder .................494
Floor mats.................................384
Fluid Brake .....................................432
Washer ..................................434
Fog lights Replacing light bulbs .............472
Switch....................................209
Wattage .................................567
Front passenger occupant 
classification system ............126
Front passenger’s seat belt 
reminder light.........................499
Front seats Adjustment ..............................78
E
F

608 Alphabetical index
PRIUS_U (OM47668U) U.S.A.
Vanity lightsVanity lights ...........................377
Wattage .................................567
Vanity mirrors...........................377
Vehicle identification 
number ...................................557
Vehicle load limits.................... 260
Warning buzzers Brake system ........................496
Open door ............................ 499
Seat belt reminder .................499
Warning lights Anti-lock brake 
system (ABS) ......................497
Automatic headlight  leveling system .... ...............497
Brake system ........................496
Charging system .... ...............497
Electric power steering .........497
High coolant temperature ......499
Low fuel level ........................499
Malfunction indicator lamp ....497
Master warning......................499
Open door ............................. 499
Pre-Collision system ............. 497
Seat belt reminder .................499
SRS airbags .......................... 497
Tire pressure .........................499
Warning messages .................. 508
Washer Checking ............................... 434
Preparing and checking 
before winter ....................... 261
Switch.................................... 210
Washing and waxing ............... 404 Weight
Cargo capacity ...................... 260
Load limits ............................. 260
Weight ................................... 556
Wheels ...................................... 455
Window glasses ........................ 98
Window lock switch................... 98
Windows Power windows ....................... 98
Rear window defogger .......... 289
Washer.................................. 210
Windshield wipers ................... 210
Winter driving tips ................... 261
Wireless remote control key Locking/Unlocking ................... 63
Replacing the battery ............ 460
WMA disc.................................. 311V
W

610
PRIUS_U (OM47668U) U.S.A.
What to do if...
What to do if...
A tire puncturesP. 524If you have a flat tire
The hybrid system does not start
P. 108Immobilizer system
P. 538If the hybrid system will not start
P. 543If the 12 volt battery is discharged
The high coolant temperature
warning light comes on
Steam can be seen coming 
from under the hood
P. 548If 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. 6 7Side doors
P. 7 2Back door
The vehicle is stuck in mud or
sandP. 553If the vehicle becomes stuck

612 What to do if...
PRIUS_U (OM47668U) U.S.A.
■Warning lights
P. 4 V VP. 497
P. 4 V T
or
P. 497
or
P. 4 V TP. 499
P. 497
or
P. 4 V SP. 497
P. 499
P. 4 V T
P. 499
P. 4 V T
P. 499
P. 4 V V
P. 499
Master warning lightSRS warning light
Charging system 
warning lightABS warning light
Malfunction indicator
lamp
Tire pressure warning
light
Brake system warning
light (red indicator)Electric power steering
warning light
Pre-collision system
warning light
High coolant temperature
warning light
Low fuel level warning
light
Automatic headlight 
leveling system 
warning light
Driver’s seat belt reminder 
light
Open door warning light
Brake system warning
light (yellow indicator) Brake system warning
light (yellow indicator) Brake system warning
light (yellow indicator)
Front passenger’s seat
belt reminder light