Get Do-it-yourself maintenance -> Engine compartment Guide for Toyota Prius 4 Door Fourth Generation (2016-2022)

506

6-3. Do-it-yourself maintenance

Engine compartment

1

6

7

Engine coolant reservoir

12-volt battery

(P. 512)

(P. 510)

Power control unit coolant

2

Fuse boxes

Engine oil level dipstick

(P. 507)

(P. 551)

reservoir

Radiator

(P. 510)

3

8

9

(P. 512)

Condenser

4

5

Engine oil filler cap (P. 508)

10

11

Electric cooling fans

Brake fluid reservoir

Washer fluid tank (P. 518)

(P. 516)

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6-3. Do-it-yourself maintenance

Engine oil

With the engine at operating temperature and turned off, check the oil

level on the dipstick.

■ Checking the engine oil

1

Park the vehicle on level ground. After warming up the engine

and turning off the hybrid system, wait more than 5 minutes for

the oil to drain back into the bottom of the engine.

2

Holding a rag under the end,

pull the dipstick out.

3

Wipe the dipstick clean.

4

Reinsert the dipstick fully.

5

Holding a rag under the end, pull the dipstick out and check the

oil level.

6

1

2

3

Low

Normal

Excessive

6

Wipe the dipstick and reinsert it fully.

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■ Adding engine oil

6-3. Do-it-yourself maintenance

If the oil level is below or near

the low level mark, add engine

oil of the same type as that

already in the engine.

Make sure to check the oil type and prepare the items needed

before adding oil.

Engine oil selection

P. 656

Oil quantity (Low  Full)

1.6 qt. (1.5 L, 1.3 Imp.qt.)

Clean funnel

Items

1

Remove the oil filler cap by turning it counterclockwise.

Add engine oil slowly, checking the dipstick.

Install the oil filler cap by turning it clockwise.

2

3

■Engine oil consumption

A certain amount of engine oil will be consumed while driving. In the following

situations, oil consumption may increase, and engine oil may need to be

refilled in between oil maintenance intervals.

●When the engine is new, for example directly after purchasing the vehicle or

after replacing the engine

●If low quality oil or oil of an inappropriate viscosity is used

●When driving at high engine speeds or with a heavy load, or when driving

while accelerating or decelerating frequently

●When leaving the engine idling for a long time, or when driving frequently

through heavy traffic

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6-3. Do-it-yourself maintenance

WARNING

■Used engine oil

●Used engine oil contains potentially harmful contaminants which may

cause skin disorders such as inflammation and skin cancer, so care

should be taken to avoid prolonged and repeated contact. To remove used

engine oil from your skin, wash thoroughly with soap and water.

●Dispose of used oil and filters only in a safe and acceptable manner. Do

not dispose of used oil and filters in household trash, in sewers or onto the

ground. Call your Toyota dealer, service station or auto parts store for

information concerning recycling or disposal.

●Do not leave used engine oil within the reach of children.

NOTICE

■To prevent serious engine damage

Check the oil level on a regular basis.

■When replacing the engine oil

●Be careful not to spill engine oil on the vehicle components.

●Avoid overfilling, or the engine could be damaged.

●Check the oil level on the dipstick every time you refill the vehicle.

●Be sure the engine oil filler cap is properly tightened.

6

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Coolant

6-3. Do-it-yourself maintenance

The coolant level is satisfactory if it is between the “FULL” and “LOW”

lines on the reservoir when the hybrid system is cold.

■ Engine coolant reservoir

1

2

3

Reservoir cap

“FULL” line

“LOW” line

If the level is on or below the

“LOW” line, add coolant up to

the “FULL” line. (P. 644)

■ Power control unit coolant reservoir

1

2

3

Reservoir cap

“FULL” line

“LOW” line

If the level is on or below the

“LOW” line, add coolant up to

the “FULL” line. (P. 646)

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6-3. Do-it-yourself maintenance

■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.

U.S.A.:

“Toyota Super Long Life Coolant” is a mixture of 50% coolant and 50% deion-

ized water. (Minimum temperature: -31F [-35C])

Canada:

“Toyota Super Long Life Coolant” is a mixture of 55% coolant and 45% deion-

ized water. (Minimum temperature: -44F [-42C])

For more details about coolant, contact your Toyota dealer.

■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 your Toyota dealer 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.

6

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.

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512

Radiator and condenser

6-3. Do-it-yourself maintenance

Check the radiator and condenser and clear away any foreign objects.

If either of the above parts is extremely dirty or you are not sure of

their condition, have your vehicle inspected by your Toyota dealer.

WARNING

■When the hybrid system is hot

Do not touch the radiator or condenser as they may be hot and cause seri-

ous injuries, such as burns.

■When the electric cooling fans are operating

Do not touch the engine compartment.

With the power switch in ON mode, the electric cooling fans may automati-

cally start to run if the air conditioning is on and/or the coolant temperature

is high. Be sure the power switch is off when working near the electric cool-

ing fans or radiator grille.

12-volt battery

Check the 12-volt battery as follows:

■ 12-volt battery exterior

Make sure that the 12-volt battery terminals are not corroded and

that there are no loose connections, cracks, or loose clamps.

Terminals

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6-3. Do-it-yourself maintenance

■When opening the cover of the positive (+) battery terminal

While pushing the portion shown in the

illustration from both sides, lift the end of

the cover up.

■Before recharging

When recharging, the 12-volt battery produces hydrogen gas which is flam-

mable and explosive. Therefore, observe the following precautions before

recharging:

●If recharging with the 12-volt battery installed on the vehicle, be sure to dis-

connect the ground cable.

●Make sure the power switch on the charger is off when connecting and dis-

connecting the charger cables to the 12-volt battery.

■After recharging/reconnecting the 12-volt battery

●Unlocking the doors using the smart key system may not be possible imme-

diately after reconnecting the 12-volt battery. If this happens, use the wire-

less remote control or the mechanical key to lock/unlock the doors.

●Start the hybrid system with the power switch in ACCESSORY mode. The

hybrid system may not start with the power switch turned off. However, the

hybrid system will operate normally from the second attempt.

6

●The power switch mode is recorded by the vehicle. If the 12-volt battery is

reconnected, the vehicle will return the power switch mode to the status it

was in before the 12-volt battery was disconnected. Make sure to turn off

the power before disconnect the 12-volt battery. Take extra care when con-

necting the 12-volt battery if the power switch mode prior to discharge is

unknown.

●Restart the hybrid system, depress the brake pedal, and confirm that it is

possible to shift into each shift position.

If the system will not start even after multiple attempts at all methods above,

contact your Toyota dealer.

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6-3. Do-it-yourself maintenance

WARNING

■Chemicals in the 12-volt battery

The 12-volt battery contains poisonous and corrosive sulfuric acid and may

produce hydrogen gas which is flammable and explosive. To reduce the risk

of death or serious injury, take the following precautions while working on or

near the 12-volt battery:

●Do not cause sparks by touching the 12-volt battery terminals with tools.

●Do not smoke or light a match near the 12-volt battery.

●Avoid contact with eyes, skin and clothes.

●Never inhale or swallow electrolyte.

●Wear protective safety glasses when working near the 12-volt battery.

●Keep children away from the 12-volt battery.

■Where to safely charge the 12-volt battery

Always charge the 12-volt battery in an open area. Do not charge the

12-volt battery in a garage or closed room where there is insufficient ventila-

tion.

■How to recharge the 12-volt battery

Only perform a slow charge (5 A or less). The 12-volt battery may explode if

charged at a quicker rate.

■Emergency measures regarding electrolyte

●If electrolyte gets in your eyes

Flush your eyes with clean water for at least 15 minutes and get immedi-

ate medical attention. If possible, continue to apply water with a sponge or

cloth while traveling to the nearest medical facility.

●If electrolyte gets on your skin

Wash the affected area thoroughly. If you feel pain or burning, get medical

attention immediately.

●If electrolyte gets on your clothes

It can soak through clothing on to your skin. Immediately take off the cloth-

ing and follow the procedure above if necessary.

●If you accidentally swallow electrolyte

Drink a large quantity of water or milk. Get emergency medical attention

immediately.

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6-3. Do-it-yourself maintenance

WARNING

■When disconnecting the 12-volt battery

Do not disconnect the negative (-) terminal on the body side. The discon-

nected negative (-) terminal may touch the positive (+) terminal, which may

cause a short and result in death or serious injury.

NOTICE

■When recharging the 12-volt battery

Never recharge the 12-volt battery while the hybrid system is operating.

Also, be sure all accessories are turned off.

6

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516

Brake fluid

6-3. Do-it-yourself maintenance

■ Checking fluid level

The brake fluid level should be

between the “MAX” and “MIN”

lines on the tank.

■ Adding fluid

1

Slide and lift up the rubber

strip to partly remove it as

shown.

2

Disconnect the claws and

remove the service cover.

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517

6-3. Do-it-yourself maintenance

3

Remove the reservoir cap.

4

Add brake fluid slowly while checking the fluid level.

Make sure to check the fluid type and prepare the necessary item.

SAE J1703 or FMVSS No.116 DOT 3 or SAE J1704

or FMVSS No.116 DOT 4 brake fluid

Fluid type

Items

Clean funnel

■Brake fluid can absorb moisture from the air

Excess moisture in the brake fluid can cause a dangerous loss of braking effi-

ciency. Use only newly opened brake fluid.

WARNING

■When filling the reservoir

6

Take care as brake fluid can harm your hands and eyes and damage

painted surfaces.

If fluid gets on your hands or in your eyes, flush the affected area with clean

water immediately.

If you still experience discomfort, see a doctor.

NOTICE

■If the brake fluid level is low or high

It is normal for the brake fluid level to go down slightly as the brake pads

wear out or when the fluid level in the accumulator is high.

If the reservoir needs frequent refilling, there may be a serious problem.

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518

Washer fluid

6-3. Do-it-yourself maintenance

1

Open the lid.

2

Vehicles with the level gauge: Check the washer fluid level on the

level gauge.

1

“NORMAL”

“LOW”

2

3

If the washer fluid level is at

“LOW”, add washer fluid.

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6-3. Do-it-yourself maintenance

■Using the gauge (if equipped)

The washer fluid level can be checked by

observing the position of the level on the

liquid-covered holes in the gauge.

If the level falls below the second hole

from the bottom (the “LOW” position), refill

the washer fluid.

Current

fluid level

WARNING

■When adding washer fluid

Do not add washer fluid when the hybrid system is hot or operating as

washer fluid contains alcohol and may catch fire if spilled on the engine etc.

NOTICE

■Do not use any fluid other than washer fluid

Do not use soapy water or engine antifreeze instead of washer fluid.

Doing so may cause streaking on the vehicle’s painted surfaces, as well as

damaging the pump leading to problems of the washer fluid not spraying.

■Diluting washer fluid

6

Dilute washer fluid with water as necessary.

Refer to the freezing temperatures listed on the label of the washer fluid bot-

tle.

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Do-it-yourself maintenance -> Engine compartment for Your Toyota Prius 4 Door Fourth Generation (2016-2022)

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