2012 TOYOTA PRIUS check engine

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

5
When trouble arises
553
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 injuries such as burns.
● Check that the indicator on the “POWER” switch and the “READY” indica-
tor are off.
● For vehicles with a hybrid system, there are times when the gasoline
engine automatically starts to run or the cooling fans suddenly start to
operate. Do not touch or approach the rotating parts of the fans, etc. Doing
so may lead to fingers, clothes or tools getting caught, resulting in 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.
■ To prevent damage to the cooling system
Observe the following precautions:
●Avoid contaminating the coolant with foreign matter (such as sand or dust
etc.)
● Do not use commercially available coolant additives

563
6-1. Specifications
6
Vehicle specifications
Electric motor (Traction motor)
Hybrid battery (traction battery)
Lubrication system
*: The engine oil capacity is a reference quantity to be used when changing the
engine oil. Warm up the engine and turn off the hybrid system, wait more
than 5 minutes, and check the oil level on the dipstick.
Ty p ePermanent magnet motor
Maximum output 60 kW
Maximum torque 153 ft•lbf (207 N•m, 21.1 kgf•m)
Ty p eNickel-Metal hydride battery
Voltage 7.2 V/module
Capacity6.5 Ah (3HR)
Quantity 28 modules
Overall voltage 201.6 V
Oil capacity
(Drain and refill 
reference
*)
With filter
Without filter
4.4 qt. (4.2 L, 3.7 Imp.qt.)
4.1 qt. (3.9 L, 3.4 Imp.qt.)

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