coolant level TOYOTA PRIUS PLUG-IN HYBRID 2020 Owners Manual

6297-2. Maintenance
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Maintenance and care
■Where to go for maintenance service?
In order to maintain your vehicle in the best possible condition, Toyota recom-
mends that maintenance service operations as well as other inspections and
repairs be carried out by authorized Toyota retailers or Toyota authorized
repairers, or any reliable repairers. For repairs and services covered by your
warranty, please visit an authorized Toyota retailer or repairer, who will use
genuine Toyota parts in repairing any difficulties you may encounter. There
can also be advantages in utilizing authorized Toyota retailers or repairers for
non-warranty repairs and services, as members of the Toyota network will be
able to expertly assist you with any difficulties you may encounter.
Your Toyota retailer or Toyota authorized repairer, or any reliable repairer will
perform all of the scheduled maintenance on your vehicle reliably and eco-
nomically due to their experience with Toyota vehicles.
■Does your vehicle need repairs?
Be on the alert for changes in performance and sounds, and visual tip-offs
that indicate service is needed. Some important clues are:
●Engine missing, stumbling or pinging
●Appreciable loss of power
●Strange engine noises
●A fluid leak under the vehicle (However, water dripping from the air condi-
tioning system after use is normal.)
●Change in exhaust sound (This may indicate a dangerous carbon monoxide
leak. Drive with the windows open and have the exhaust system checked
immediately.)
●Flat-looking tires, excessive tire squeal when cornering, uneven tire wear
●Vehicle pulls to one side when driven straight on a level road
●Strange noises related to suspension movement
●Loss of brake effectiveness, spongy feeling brake pedal, pedal almost
touches the floor, vehicle pulls to one side when braking
●Engine coolant temperature continually higher than normal (P. 716, 761)
If you notice any of these clues, take your vehicle to any authorized Toyota
retailer or Toyota authorized repairer, or any reliable repairer as soon as pos-
sible. Your vehicle may need adjustment or repair.

6317-3. Do-it-yourself maintenance
Prius Plug-in Hybrid_OM_OM47D72E_(EE)
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Maintenance and care
Do-it-yourself service precautions
If you perform maintenance by yourself, be sure to follow the
correct procedure as given in these sections.
ItemsParts and tools
12-volt battery
condition
(P. 644)• Warm water • Baking soda • Grease
• Conventional wrench (for terminal clamp bolts)
• Distilled water
Engine/power
control unit
coolant level
(P. 641)• “Toyota Super Long Life Coolant” or a similar high
quality ethylene glycol-based non-silicate, non-
amine, non-nitrite and non-borate coolant with long-
life hybrid organic acid technology
“Toyota Super Long Life Coolant” is pre-mixed with
50% coolant and 50% deionized water.
• Funnel (used only for adding coolant)
Engine oil level
(P. 638)• “Toyota Genuine Motor Oil” or equivalent
• Rag or paper towel
• Funnel (used only for adding engine oil)
Fuses (P. 6 9 1 )• Fuse with same amperage rating as original
Hybrid battery
(traction battery)
air intake vent
(P. 623)
• Vacuum cleaner, etc.
• Flathead screwdriver
Light bulbs
(P. 695)
• Bulb with same number and wattage rating as origi-
nal
• Flathead screwdriver
• Wrench
Radiator and
condenser
(P. 643)

Tire inflation
pressure
(P. 665)• Tire pressure gauge
• Compressed air source
Washer fluid
(P. 648)• Water or washer fluid containing antifreeze (for win-
ter use)
• Funnel (used only for adding water or washer fluid)

6377-3. Do-it-yourself maintenance
Prius Plug-in Hybrid_OM_OM47D72E_(EE)
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Maintenance and care
Engine compartment
IO73PH114
Engine coolant reservoir
( P. 641)
Fuse boxes ( P. 691)
Engine oil level dipstick
( P. 638)
Engine oil filler cap ( P. 639)
Washer fluid tank ( P. 648)
12-volt battery ( P. 644)
Power control unit coolant
reservoir ( P. 641)
Radiator ( P. 643)
Condenser ( P. 643)
Electric cooling fans
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6417-3. Do-it-yourself maintenance
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Maintenance and care
The coolant level is satisfactory if it is between the “MAX” and “MIN”
lines on the reservoir when the hybrid system is cold.
■Engine coolant reservoir
Reservoir cap
“MAX” line
“MIN” line
If the level is on or below the
“MIN” line, add coolant up to the
“MAX” line. ( P. 761)
■Power control unit coolant reservoir
Reservoir cap
“FULL” line
“LOW” line
If the level is on or below the
“LOW” line, add coolant up to
the “FULL” line. ( P. 761)
Coolant
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6427-3. Do-it-yourself maintenance
Prius Plug-in Hybrid_OM_OM47D72E_(EE)
■Coolant selection
Only use “Toyota Super Long Life Coolant” or a similar high quality ethylene
glycol based non-silicate, non-amine, non- nitrite, and non-borate coolant with
long-life hybrid organic acid technology.
“Toyota Super Long Life Coolant” is a mixture of 50% coolant and 50% deion-
ized water. (Minimum temperature: -35 C [-31F])
For more details about coolant, contact any authorized Toyota retailer or
Toyota authorized repairer, or any reliable repairer.
■ If the coolant level drops within a short time of replenishing
Visually check the radiator, hoses, engine/power control unit coolant reservoir
caps, drain cock and water pump.
If you cannot find a leak, have any authorized Toyota retailer or Toyota autho-
rized repairer, or any reliable repairer, test the cap and check for leaks in the
cooling system.
WARNING
■ When the hybrid system is hot
Do not remove the engine/power control unit coolant reservoir caps.
The cooling system may be under pressure and may spray hot coolant if the
cap is removed, causing serious injuries, such as burns.
NOTICE
■ When adding coolant
Coolant is neither plain water nor straight antifreeze. The correct mixture of
water and antifreeze must be used to provide proper lubrication, corrosion
protection and cooling. Be sure to read the antifreeze or coolant label.
■ If you spill coolant
Be sure to wash it off with water to prevent it from damaging parts or paint.

7138-2. Steps to take in an emergency
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When trouble arises
If you think something is wrong
● Fluid leaks under the vehicle
(Water dripping from the air conditioning after use is normal.)
● Flat-looking tires or uneven tire wear
● High coolant temperature warning light flashes or comes on
● Changes in exhaust sound
● Excessive tire squeal when cornering
● Strange noises related to the suspension system
● Pinging or other noises related to the hybrid system
● Engine missing, stumbling or running roughly
● Appreciable loss of power
● Vehicle pulls heavily to one side when braking
● Vehicle pulls heavily to one side when driving on a level road
● Loss of brake effectiveness, spongy feeling, pedal almost touches
the floor
If you notice any of the following symptoms, your vehicle proba-
bly needs adjustment or repair. Contact any authorized Toyota
retailer or Toyota authorized repairer, or any reliable repairer as
soon as possible.
Visible symptoms
Audible symptoms
Operational symptoms

7628-2. Steps to take in an emergency
Prius Plug-in Hybrid_OM_OM47D72E_(EE)
The coolant level is satisfactory if it is between the “MAX” and
“MIN” lines on the reservoir.
Reservoir
“MAX” line
“MIN” line
Add coolant if necessary.
Water can be used in an emer-
gency if coolant is unavailable.
Start the hybrid system and turn the air conditioning system on to
check that the radiator cooling fans operate and to check for
coolant leaks from the radiator or hoses.
The fans operate when the temperature setting is adjusted to “LO” and
“A/C” switch ( ) is turned on immediately after a cold start. Con-
firm that the fans are operating by checking the fan sound and air flow. If
it is difficult to check these, turn the “A/C” switch ( ) on and off
repeatedly. (The fans may not operate in freezing temperatures.)
If the fans are not operating:
Stop the hybrid system immediately and contact any authorized
Toyota retailer or Toyota authorized repairer, or any reliable
repairer.
If the fans are operating:
Have the vehicle inspected at the nearest any authorized Toyota
retailer or Toyota authorized repairer, or any reliable repairer.
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7638-2. Steps to take in an emergency
Prius Plug-in Hybrid_OM_OM47D72E_(EE)
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When trouble arises
■If “Hybrid System Overheated” is shown on the multi-informa-
tion display
Stop the vehicle in a safe place.
Stop the hybrid system and carefully lift the hood.
After the hybrid system has cooled down, inspect the hoses and
radiator core (radiator) for any leaks.
Radiator
Cooling fans
If a large amount of coolant
leaks, immediately contact
any authorized Toyota retailer
or Toyota authorized repairer,
or any reliable repairer.
The coolant level is satisfactory if it is between the “FULL” and
“LOW” lines on the reservoir.
Reservoir
“FULL” line
“LOW” line
Add coolant if necessary.
Water can be used in an emer-
gency if coolant is unavailable.
If water was added in an emer-
gency, have the vehicle
inspected at any authorized
Toyota retailer or Toyota autho-
rized repairer, or any reliable
repairer as soon as possible.
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804Alphabetical index
Prius Plug-in Hybrid_OM_OM47D72E_(EE)
Flat tire ...................................... 731
Floor mats .................................. 30
Fluid
Brake..................................... 778
Transmission......................... 777
Washer.................................. 648
Fog lights.................................. 397
Replacing light bulbs ............. 700
Switch ................................... 397
Follow me home system ......... 388
Footwell lights.......................... 591
Front doors............................... 283
Front fog lights ........................ 397
Replacing light bulbs ............. 700
Switch ................................... 397
Front passenger’s seat belt
reminder light ........................ 717
Front position lights ................ 387
Light switch ........................... 387
Replacing light bulbs ............. 700
Front seat concentrated
airflow mode (S-FLOW)......... 575
Front seats ............................... 339
Adjustment ............................ 339
Cleaning ................................ 622
Correct driving posture............ 32
Head restraints...................... 343
Seat heaters.......................... 589
Front turn signal lights............ 385
Replacing light bulbs ............. 700
Turn signal lever ................... 385
Fuel ........................................... 401
Capacity ................................ 772
Fuel gauge ............................ 222
Information ............................ 780
Refueling ............................... 401
Type ...................................... 772
Warning light ......................... 717
Fuel consumption ............ 244, 275
Average fuel consumption .... 244
Current fuel consumption ...... 275Fuel filler door.......................... 403
Opener .................................. 403
Refueling............................... 401
When the fuel filler door
cannot be opened............... 403
Fuses ........................................ 691
Glove box ................................. 595
Hands-free system (for
cellular phone)
*
Head restraints ........................ 343
Head-up display ....................... 264
Headlights ................................ 387
AHS (Adaptive High-beam
System) .............................. 391
Automatic headlight
leveling ............................... 389
Follow me home system ....... 388
Light switch ........................... 387
Replacing light bulbs............. 700
Heaters
Automatic air conditioning
system ................................ 572
Hybrid battery (traction
battery) ............................... 154
Outside rear view mirrors...... 577
Seat heaters ......................... 589
High coolant temperature
warning light .......................... 716
High mounted stoplight
Replacing .............................. 700
High-voltage components ...... 108
Hill-start assist control............ 559
Hood ......................................... 634
Hooks
Coat hooks............................ 613
Grocery bag hook ................. 601
Retaining hooks (floor mat)..... 30
F
G
H

814Alphabetical index
Prius Plug-in Hybrid_OM_OM47D72E_(EE)
Warning lights .......................... 215
ABS ....................................... 715
Brake Override System ......... 719
Brake system ........................ 714
Charging system ................... 714
Drive-Start Control ................ 719
Driver’s seat belt reminder
light ..................................... 717
Electronic engine control
system ................................ 715
Electric power steering
system ................................ 715
Front passenger’s seat belt
reminder light...................... 717
High coolant temperature...... 716
Low engine oil pressure ........ 715
Low fuel level ........................ 717
Malfunction indicator lamp .... 715
Master warning light .............. 717
Open door ............................. 717
Parking Support Brake
function ............................... 719
PCS....................................... 716
PKSB OFF indicator.............. 717
Rear passengers’ seat belt
reminder light...................... 717
Seat belt reminder light ......... 717
Slip indicator ......................... 716
SRS....................................... 715
Tire pressure ......................... 718
Warning messages .................. 723Warning reflector storage
space ...................................... 602
Washer...................................... 398
Checking ............................... 648
Preparing and checking
before winter....................... 566
Switch ................................... 398
Washing and waxing ............... 616
Water-repellent coating........... 617
Wheels ...................................... 667
Replacing wheels.................. 669
Size ....................................... 779
Window glasses....................... 352
Window lock switch ................ 352
Windows ................................... 352
Power windows ..................... 352
Rear window defogger .......... 577
Washer ................................. 398
Windshield wipers ................... 398
Handling the wiper arms ....... 621
Rain-sensing windshield
wipers ................................. 398
Replacing the wiper insert .... 685
Winter driving tips ................... 566
Wiper insert replacement........ 685
Wireless charger...................... 607
Wireless remote control.......... 278
Battery-Saving Function ....... 295
Locking/Unlocking................. 283
Remote Air Conditioning
System ............................... 585
Replacing the battery ............ 688