2023 TOYOTA PRIUS PLUG-IN HYBRID coolant

7088-2. Steps to take in an emergency
Prius Plug-in Hybrid_OM_OM47F38E_(EE)
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. 213) 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.
6

7098-2. Steps to take in an emergency
Prius Plug-in Hybrid_OM_OM47F38E_(EE)
8
When trouble arises
NOTICE
■When adding engine/power control unit coolant
Add coolant slowly after the hybrid system has cooled down sufficiently.
Adding cool coolant to a hot hybrid system 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 any coolant additive.

7209-1. Specifications
Prius Plug-in Hybrid_OM_OM47F38E_(EE)
*: The fluid capacity is the quantity of reference.
If replacement is necessary, contact any authorized Toyota retailer or
Toyota authorized repairer, or any reliable repairer.
Cooling system
Capacity*
Gasoline
engine6.2 L (6.6 qt., 5.5 Imp.qt.)
Power
control unit1.5 L (1.6 qt., 1.3 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 technology
Do not use plain water alone.
Ignition system (spark plug)
MakeDENSO FC16HR-CY9
Gap0.9 mm (0.035 in.)
NOTICE
■ Iridium-tipped spark plugs
Use only iridium-tipped spark plugs. Do not adjust the spark plug gap.

745Alphabetical index
Prius Plug-in Hybrid_OM_OM47F38E_(EE)
Child-protectors ....................... 276
Cleaning............................ 566, 572
Aluminum wheels .................. 567
Exterior.................................. 566
Front camera......................... 358
Hybrid battery (traction
battery) air intake vent ........ 573
Interior ................................... 572
Radar sensor ........................ 357
Seat belts .............................. 575
Water-repellent coating ......... 567
Clock ......................................... 194
Adjustment ............................ 200
Coat hooks ............................... 563
Combination meter .................. 194
Clock adjustment .................. 200
Main display .......................... 212
Multi-information display ....... 220
Warning lights and
indicators ............................ 204
Condenser ................................ 593
Console box ............................. 545
Consumption screen ............... 264
Coolant ..................................... 591
Capacity ................................ 720
Checking ............................... 591
Preparing and checking
before winter....................... 516
Cooling system ........................ 591
Engine overheating ............... 705
Hybrid system overheating ... 707
Cruise control
Dynamic radar cruise control
with full-speed range .......... 401
Cup holders .............................. 546
Curtain shield airbags ............... 39
Customizable features ............ 726Daytime running light
system .................................... 338
Deck board ............................... 550
Defogger
Outside rear view mirrors...... 527
Rear window ......................... 527
Windshield ............................ 527
Dimension ................................ 714
Display
Drive information................... 222
Dynamic radar cruise control
with full-speed range .......... 401
Energy monitor ............. 223, 261
Head-up display .................... 254
LTA (Lane Tracing Assist) .... 388
Main display .......................... 212
Multi-information display ....... 220
Parking Support Brake
function ............................... 468
Pre-collision warning............. 369
RCTA detection screen......... 423
RSA (Road Sign Assist)........ 396
S-IPA (Simple Intelligent
Parking Assist System) ...... 477
Toyota parking assist
sensor................................. 451
Warning messages ............... 667
Do-it-yourself maintenance .... 581
Door courtesy lights................ 541
Location ................................ 541
Wattage ................................ 723D

747Alphabetical index
Prius Plug-in Hybrid_OM_OM47F38E_(EE)
Emergency brake signal ......... 510
Emergency flashers................. 648
Emergency brake signal ....... 510
Emergency tire puncture
repair kit ................................. 675
Energy monitor ................ 223, 261
Engine
Accessory mode ................... 325
Compartment ........................ 587
Engine switch ........................ 323
Exhaust gas precautions......... 50
Hood ..................................... 584
How to start the hybrid
system ................................ 323
Identification number............. 716
If the hybrid system will not
start..................................... 693
If your vehicle has to be
stopped in an emergency ... 649
Ignition switch (power
switch) ................................ 323
Overheating .......................... 705
Power switch ......................... 323
Engine coolant ......................... 591
Capacity ................................ 720
Checking ............................... 591
Preparing and checking
before winter....................... 516Engine oil ................................. 588
Capacity ................................ 717
Checking ............................... 588
Oil pressure warning light ..... 660
Preparing and checking
before winter....................... 516
Engine switch (power
switch) .................................... 323
Auto power off function ......... 325
Changing the power switch
modes................................. 325
If your vehicle has to be
stopped in an emergency ... 649
Starting the hybrid system .... 323
EPS (Electric Power
Steering)................................. 510
Function ................................ 510
Warning light ......................... 660
EV City mode switch ................. 88
EV driving range ...................... 109
EV mode ..................................... 85
EV/HV mode selection
switch ....................................... 88
Exhaust gas precautions .......... 50
Extended Headlight
Lighting system..................... 338

748Alphabetical index
Prius Plug-in Hybrid_OM_OM47F38E_(EE)
Flat tire ...................................... 675
Floor mats .................................. 30
Fluid
Brake..................................... 722
Transmission......................... 721
Washer.................................. 598
Fog lights.................................. 347
Replacing light bulbs ............. 644
Switch ................................... 347
Footwell lights.......................... 541
Front doors............................... 273
Front fog lights ........................ 347
Replacing light bulbs ............. 644
Switch ................................... 347
Front passenger’s seat belt
reminder light ........................ 662
Front position lights ................ 337
Light switch ........................... 337
Replacing light bulbs ............. 644
Front seat concentrated
airflow mode (S-FLOW)......... 525
Front seats ............................... 290
Adjustment ............................ 290
Cleaning ................................ 572
Correct driving posture............ 32
Head restraints...................... 294
Seat heaters.......................... 539
Front turn signal lights............ 335
Replacing light bulbs ............. 644
Turn signal lever ................... 335
Fuel ........................................... 351
Capacity ................................ 716
Fuel gauge ............................ 212
Information ............................ 724
Refueling ............................... 351
Type ...................................... 716
Warning light ......................... 662
Fuel consumption ............ 234, 264
Average fuel consumption .... 234
Current fuel consumption ...... 264Fuel filler door.......................... 353
Opener .................................. 353
Refueling............................... 351
When the fuel filler door
cannot be opened............... 353
Fuses ........................................ 635
Glove box ................................. 545
Hands-free system (for
cellular phone)
*
Head restraints ........................ 294
Head-up display ....................... 254
Headlights ................................ 337
AHS (Adaptive High-beam
System) .............................. 341
Automatic headlight
leveling ............................... 339
Extended Headlight
Lighting system .................. 338
Light switch ........................... 337
Replacing light bulbs............. 644
Heaters
Automatic air conditioning
system ................................ 522
Hybrid battery (traction
battery) ............................... 144
Outside rear view mirrors...... 527
Seat heaters ......................... 539
High coolant temperature
warning light .......................... 661
High mounted stoplight
Replacing .............................. 644
High-voltage components ........ 98
Hill-start assist control............ 509
Hood ......................................... 584
F
G
H

752Alphabetical index
Prius Plug-in Hybrid_OM_OM47F38E_(EE)
Navigation system*
Odometer .................................. 214
Oil
Engine oil .............................. 717
Opener
Back door .............................. 278
Fuel filler door ....................... 353
Hood ..................................... 584
Outside rear view mirrors ....... 301
Adjustment ............................ 301
BSM (Blind Spot Monitor) ..... 423
Folding .................................. 301
Outside rear view mirror
defoggers............................ 527
Outside temperature
display .................................... 212
Overhead console.................... 548
Overheating .............................. 705
P position switch ..................... 330
Panoramic view monitor
*
Parking assist sensors
Parking Support Brake
function ............................... 462
S-IPA (Simple Intelligent
Parking Assist System)....... 473
Toyota parking
assist-sensor ...................... 450Parking brake ........................... 336
Operation .............................. 336
Parking brake engaged
warning buzzer ................... 336
Parking lock ............................. 330
Parking Support Brake
function .................................. 462
PCS (Pre-Collision System) .... 368
Enabling/disabling the
system ................................ 372
Function ................................ 368
Warning light ......................... 661
Personal lights ......................... 541
Switch ................................... 542
Wattage ................................ 723
Plug-in hybrid system ............... 84
Driving tips ............................ 105
EV City mode .......................... 85
EV driving range ................... 109
EV mode ................................. 85
EV/HV mode selection
switch ................................... 88
Features.................................. 84
How to charge....................... 155
HV mode ................................. 85
Hybrid battery (traction
battery) charge mode ........... 85
Power control unit coolant ..... 591
Capacity ................................ 720
Checking ............................... 591
Preparing and checking
before winter....................... 516
Radiator ................................ 593
N
O
P

758Alphabetical index
Prius Plug-in Hybrid_OM_OM47F38E_(EE)
Warning lights .......................... 205
ABS ....................................... 660
Brake Override System ......... 663
Brake system ........................ 659
Charging system ................... 659
Drive-Start Control ................ 663
Driver’s seat belt reminder
light ..................................... 662
Electronic engine control
system ................................ 660
Electric power steering
system ................................ 660
Front passenger’s seat belt
reminder light...................... 662
High coolant temperature...... 661
Low engine oil pressure ........ 660
Low fuel level ........................ 662
Malfunction indicator lamp .... 660
Master warning light .............. 662
Open door ............................. 662
Parking Support Brake
function ............................... 663
PCS....................................... 661
PKSB OFF indicator.............. 662
Rear passengers’ seat belt
reminder light...................... 662
Seat belt reminder light ......... 662
Slip indicator ......................... 661
SRS....................................... 660
Tire pressure ......................... 663
Warning messages .................. 667Warning reflector storage
space ...................................... 552
Washer...................................... 348
Checking ............................... 598
Preparing and checking
before winter....................... 516
Switch ................................... 348
Washing and waxing ............... 566
Water-repellent coating........... 567
Wheels ...................................... 610
Replacing wheels.................. 612
Size ....................................... 723
Window glasses....................... 303
Window lock switch ................ 303
Windows ................................... 303
Power windows ..................... 303
Rear window defogger .......... 527
Washer ................................. 348
Windshield wipers ................... 348
Handling the wiper arms ....... 571
Rain-sensing windshield
wipers ................................. 348
Replacing the wiper insert .... 629
Winter driving tips ................... 516
Wiper insert replacement........ 629
Wireless charger...................... 557
Wireless remote control.......... 268
Battery-Saving Function ....... 285
Locking/Unlocking................. 273
Remote Air Conditioning
System ............................... 535
Replacing the battery ............ 632