engine TOYOTA PRIUS PLUG-IN 2013 Workshop Manual

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4-3. Do-it-yourself maintenance
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Maintenance and care
CAUTION
The engine compartment contains many mechanisms and fluids that may
move suddenly, become hot, or become electrically energized. To avoid death
or serious injury, observe the following precautions.
■When working on the engine compartment
●Make sure that the indicator on the “POWER” switch and the “READY”
indicator are both off.
●Keep hands, clothing and tools away from the moving fan.
●Be careful not to touch the engine, power control unit, radiator, exhaust
manifold, etc. right after driving as they may be hot. Oil and other fluids
may also be hot.
●Do not leave anything that may burn easily, such as paper and rags, in the
engine compartment.
●Do not smoke, cause sparks or expose an open flame to fuel. Fuel fumes
are flammable.
■When working near the electric cooling fans or radiator grille
Be sure the “POWER” switch is off.
With the “POWER” switch in ON mode, the electric cooling fans may auto-
matically start to run if the air conditioning is on and/or the coolant tempera-
ture is high. (→P. 4 6 6 )
■Safety glasses
Wear safety glasses to prevent flying or falling material, fluid spray, etc. from
getting in your eyes.
NOTICE
■If you remove the air cleaner filter
Driving with the air cleaner filter removed may cause excessive engine wear
due to dirt in the air.

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Maintenance and care
Engine compar tment
■12-volt battery
→P. 4 7 1
Engine coolant reservoir
(→P. 4 6 4 )
Engine oil level dipstick
(→P. 4 6 0 )
Engine oil filler cap
(→P. 4 6 1 )
Power control unit coolant
reservoir (→P. 4 6 4 )
Brake fluid reservoir
(→P. 4 6 7 )
Fuse box (→P. 4 9 5 )
Radiator (→P. 4 6 6 )
Condenser (→P. 4 6 6 )
Electric cooling fans
Washer fluid tank (→P. 4 6 9 )

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Engine oil
With the engine at operating temperature and turned off, check the oil
level on the dipstick.
■Checking the engine oil
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.
Holding a rag under the end, pull
the dipstick out.
Wipe the dipstick clean.
Flat dipstick: Reinsert the dipstick fully.
Non-flat dipstick: Reinsert the
dipstick fully with its protruding
areas ( in the illustration)
pointing towards the engine.
Holding a rag under the end, pull the dipstick out and check
the oil level.
Wipe the dipstick and reinsert it fully.
STEP 1
STEP 2
STEP 3
STEP 4
STEP 4
STEP 5
STEP 6

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Maintenance and care
Flat dipstick
Low
Normal
Excessive
The shape of the dipstick may
differ depending on the type of
vehicle or engine.
Non-flat dipstick
Low
Normal
Excessive
The shape of the dipstick may
differ depending on the type of
vehicle or engine.
■Adding engine oil
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.

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Make sure to check the oil type and prepare the items needed before
adding oil.
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.
Engine oil selection→P. 6 1 5
Oil quantity
(Low → Full)1.6 qt. (1.5 L, 1.3 Imp.qt.)
Items Clean funnel
■Engine oil consumption
A certain amount of engine oil will be consumed while driving. In the follow-
ing 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
STEP 1
STEP 2
STEP 3

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Maintenance and care
CAUTION
■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 p r e v e n t s e r i o u s e n g i n e d a m a g e
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.

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Coolant
The coolant level is satisfactory if it is between the full (“FULL” or “F”)
and low (“LOW” or “L”) lines on the reservoir when the hybrid system
is cold.
Engine 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. 6 1 7 )
Power control unit coolant reservoir
Reservoir cap
“F” line
“L” line
If the level is on or below the “L”
line, add coolant up to the “F” line.
(→P. 6 1 7 )
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Maintenance and care
■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% cool-
ant and 50% deionized water. (Minimum temperature: -31 °F
[-35 °C])
Canada: “Toyota Super Long Life Coolant” is a mixture of 55% cool-
ant and 45% deionized 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 reser-
voir 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.
CAUTION
■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.

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CAUTION
■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.
■Diluting washer fluid
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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Maintenance and care
Checking and replacing fuses
If any of the electrical components do not operate, a fuse may have
blown. If this happens, check and replace the fuses as necessary.
Turn the “POWER” switch off.
Ve h i c l e s w i t h S o l a r Ve n t i l a t i o n S ystem: Turn the Solar Ventilation
System off and make sure not to operate the Remote Air Condi-
tioning System.
Open the fuse box cover.
Engine compartment
Push the tab in and lift the lid
off.
When closing, first hook the lid
onto the two rear tabs.
Left side instrument panel
Remove the lid.
After a system failure, see “Fuse layout and amperage rat-
ings” (→P. 4 9 8 ) f o r d e t a i l s a b o u t w h i c h f u s e t o c h e c k .
STEP 1
STEP 2
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STEP 3