2021 TOYOTA YARIS CROSS check engine

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6-3. Do-it-yourself maintenance
the reservoir when the engine is
cold.
Reservoir cap
“F” line
“L” line
If the level is on or below the “L” line,
add coolant up to the “F” line. ( P.481)
■Power control unit coolant
reservoir
The coolant level is satisfactory if it
is between the “F” and “L” lines on
the reservoir when the hybrid sys-
tem is cold.
Reservoir cap
“F” line
“L” line
If the level is on or below the “L” line,
add coolant up to the “F” line. ( P.481)
■Coolant selection
Only use “Toyota Super Long Life Cool-
ant” 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 reser-
voir caps, drain cock and water pump. If you cannot find a leak, have any authorized Toyota retailer or Toyota
authorized 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 con-
trol unit coolant reservoir caps. ( P.483)
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 mix- ture of water and antifreeze must be used to provide proper lubrication,
corrosion protection and cooling. Be sure to read the antifreeze or coolant label.

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6-3. Do-it-yourself maintenance
Maintenance and care
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 any authorized Toyota
retailer or Toyota authorized
repairer, or any reliable repairer.
If the washer fluid level is at “1/2”,
add washer fluid.
NOTICE
■If you spill coolant
Be sure to wash it off with water to
prevent it from damaging parts or paint.
Checking the radiator and
condenser
WARNING
■When the hybrid system is hot
Do not touch the radiator or con-
denser as they may be hot and cause serious injuries, such as burns.
Adding the washer fluid
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 prob-
lems of the washer fluid not spraying.
■Diluting washer fluid
Dilute washer fluid with water as nec- essary.Refer to the freezing temperatures
listed on the label of the washer fluid bottle.

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6-3. Do-it-yourself maintenance
1Turn the power switch off.
2 Open the fuse box cover.
Engine compartment: type A
fuse box
Push the tabs in and lift the lid off.
Engine compartment: type B
fuse box
Push the tabs in and lift the lid off.
WARNING
■Removed battery and other parts
These parts are small and if swal-
lowed by a child, they can cause choking. Keep away from children. Failure to do so could result in death
or serious injury.
■Lithium battery precautions
CAUTION RISK OF EXPLOSION IF BATTERY IS REPLACED BY AN INCORRECT
TYPE. DISPOSE OF USED BATTERIES ACCORDING TO THE INSTRUC-
TIONS
NOTICE
■When replacing the battery
Use a flathead screwdriver of appro- priate size. Applying excessive force may deform or damage the cover.
■For normal operation after replacing the battery
Observe the following precautions to prevent accidents:
●Always work with dry hands.Moisture may cause the battery to
rust.
●Do not touch or move any other
component inside the remote con- trol.
●Do not bend either of the battery terminals.
■When removing the battery cover (vehicles without a smart entry & start system)
Do not forcibly remove the battery cover, otherwise it may be damaged. If the battery cover is difficult to
remove, lift the edge to remove it.
Checking and replacing
fuses
If any of the electrical compo-
nents do not operate, a fuse
may have blown. If this hap-
pens, check and replace the
fuses as necessary.
Checking and replacing
fuses

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7-2. Steps to take in an emergency
When trouble arises
■Warning messages
The warning messages explained below
may differ from the actual messages according to operation conditions and vehicle specifications.
■Warning buzzer
A buzzer may sound when a message is displayed. The buzzer may not be audible if the
vehicle is in a noisy location or if the audio system volume is high.
■If “Engine Oil Level Low Add or Replace” is displayed
The engine oil level is low. Check the
level of the engine oil, and add if neces-
sary.
This message may appear if the vehicle is stopped on a slope. Move the vehicle
to a level surface and check to see if the message disappears.
■If “Hybrid System Stopped Steering Power Low” is displayed
This message is displayed if the hybrid system is stopped while driving.
When steering wheel operations are
heavier than usual, grip the steering wheel firmly and operate it using more force than usual.
■If “Hybrid System Overheated Out-
put Power Reduced” is displayed
This message may be displayed when driving under severe operating condi-
tions. (For example, when driving up a long steep hill.) Handling method: P. 4 8 1
■If “Traction Battery Needs to be
Protected Refrain from the Use of N Position” is displayed
This message may be displayed when
the shift lever is in N.
As the hybrid battery (traction battery) cannot be charged when the shift lever
is in N, shift the shift lever to P when the vehicle is stopped.
■If “Traction Battery Needs to be Protected Shift into P to Restart” is
displayed
This message is displayed when the hybrid battery (traction battery) charge
has become extremely low because the shift lever has been left in N for a certain amount of time.
When operating the vehicle, shift to P and restart the hybrid system.
■If “Shift to P Before Exiting Vehicle” is shown
Message is displayed when the driver’s door is opened without turning the power switch to OFF with the shift lever
in any position other than P. Shift the shift lever to P.
If a warning message is
displayed
The multi-information display
shows warnings for system
malfunctions and incorrectly
performed operations, and
messages that indicate a need
for maintenance. When a mes-
sage is displayed, perform the
appropriate corrective action
for the message.
If a warning message is dis-
played again after the appro-
priate actions have been
performed, contact any autho-
rized Toyota retailer or Toyota
authorized repairer, or any reli-
able repairer.
Additionally, if a warning light
comes on or flashes at the
same time that a warning mes-
sage is displayed, take the
appropriate corrective action
for the warning light. ( P.439)

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7-2. Steps to take in an emergency
■If “Shift Out of N Release Accelera-
tor Before Shifting” is displayed
The accelerator pedal has been depressed when the shift lever is in N.
Release the accelerator pedal and shift the shift lever to D or R.
■If “Press Brake when Vehicle is Stopped Hybrid System may Over-
heat” is displayed
The message may be displayed when the accelerator pedal is depressed to
hold the vehicle while the vehicle is stopped on an incline, etc. The hybrid system may overheat. Release the
accelerator pedal and depress the brake pedal.
■If “Auto Power OFF to Conserve Battery” is displayed
Power was cut off due to the automatic power off function. Next time when start-ing the hybrid system, operate the
hybrid system for approximately 5 min- utes to recharge the 12-volt battery.
■If “Headlight System Malfunction Visit Your Dealer” is displayed
The following systems may be malfunc- tioning. Have the vehicle inspected by any authorized Toyota retailer or Toyota
authorized repairer, or any reliable repairer immediately.
●The LED headlight system (if equipped)
●AHS (Adaptive High-beam System) (if equipped)
●Automatic High Beam (if equipped)
■If a message that indicates the mal-function of front camera is dis-played
The following systems may be sus- pended until the problem shown in the message is resolved. ( P.229, 439)
●PCS (Pre-Collision System) (if equipped)
●LTA (Lane Tracing Assist) (if equipped)
●AHS (Adaptive High-beam System) (if
equipped)
●Automatic High Beam (if equipped)
●RSA (Road Sign Assist) (if equipped)
●Dynamic radar cruise control with full-
speed range (if equipped)
■If a message that indicates the mal- function of radar sensor is dis-played
The following systems may be sus- pended until the problem shown in the message is resolved. ( P.229, 439)
●PCS (Pre-Collision System) (if equipped)
●LTA (Lane Tracing Assist) (if equipped)
●Dynamic radar cruise control with full-speed range (if equipped)
■If “Oil Maintenance Required Soon”
is displayed
Indicates that the engine oil should be scheduled to be changed.
Check the engine oil and change it if necessary.
After changing the engine oil, make sure
to reset the message. ( P.391)
■If “Oil Maintenance Required Visit Your Dealer” is displayed
Indicates that the engine oil should be
changed.
Check and change the engine oil, and oil filter by any authorized Toyota retailer
or Toyota authorized repairer, or any reli- able repairer. After changing the engine oil, make sure to reset the message.
( P.391)
■If “Radar Cruise Control Temporar- ily Unavailable See Owner’s Man-ual” is displayed (if equipped)
The dynamic radar cruise control with full-speed range system is suspended temporarily or until the problem shown
in the message is resolved. (causes and coping methods: P.229)

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7-2. Steps to take in an emergency
When trouble arises
■If “Radar Cruise Control Unavail-
able” is displayed (if equipped)
The dynamic radar cruise control with full-speed range system cannot be used
temporarily. Use the system when it becomes available again.
■If a message that indicates the need for visiting your Toyota dealer
is displayed
The system or part shown on the multi- information display is malfunctioning.
Have the vehicle inspected by any authorized Toyota retailer or Toyota authorized repairer, or any reliable
repairer immediately.
■If a message that indicates the need for referring to Owner’s Man-ual is displayed
●If “Engine Coolant Temp High Stop in a Safe Place See Owner’s Manual” is
displayed, follow the instructions accordingly. ( P.481)
●If “Exhaust Filter Full See Owner’s Manual” is displayed, follow the instructions accordingly. ( P.335)
●If “Oil Pressure Low Stop in a Safe Place See Owner’s Manual” is dis-
played, follow the instructions accord- ingly. ( P.389)
●If any of the following messages are displayed on the multi-information dis-play, it may indicate a malfunction.
Have the vehicle inspected by any authorized Toyota retailer or Toyota authorized repairer, or any reliable
repairer immediately. • “Smart Entry & Start System Malfunc-tion See Owner’s Manual”
• “Hybrid System Malfunction” • “Check Engine”• “Hybrid Battery System Malfunction”
• “Accelerator System Malfunction” • “Hybrid System Stopped”• “Engine Stopped”
●If any of the following messages are displayed on the multi-information dis-
play, it may indicate a malfunction. Immediately stop the vehicle and con-tact any authorized Toyota retailer or
Toyota authorized repairer, or any reli-
able repairer. • “Braking Power Low Visit Your Dealer”• “12-Volt Battery Charging System
Malfunction Visit Your Dealer”
●If “Low Auxiliary Battery See Owner’s
Manual” is shown, • When the display goes off after sev-eral seconds (displays for about 6
seconds): Maintain the hybrid system operation for more than 15 minutes and charge the 12-volt battery.
• When the display does not go off: Start up the hybrid system using the procedures: P. 4 7 6
●If “Maintenance Required for Traction Battery Cooling Parts See Owner’s
Manual” is shown, the filters may be clogged, the air intake vents may be blocked, or there may be a gap in the
duct. Therefore, perform the following correction procedure.• If the air intake vents and filters of the
hybrid battery (traction battery) are dirty, perform the procedure on P.412 to clean them.
• If the warning message is shown when the air intake vents and filters of the hybrid battery (traction battery) are
not dirty, have the vehicle inspected by any authorized Toyota retailer or Toyota authorized repairer, or any reli-
able repairer immediately.
■If “Maintenance Required For Trac- tion Battery At Your Dealer” is dis-played
The hybrid battery (traction battery) is scheduled to be inspected or replaced. Have the vehicle inspected by any
authorized Toyota retailer or Toyota authorized repairer, or any reliable repairer immediately.
●Continuing to drive the vehicle without having the hybrid battery (traction bat-
tery) inspected will cause the hybrid system not to start.
●If the hybrid system does not start, contact any authorized Toyota retailer or Toyota authorized repairer, or any
reliable repairer immediately.

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7-2. Steps to take in an emergency
When trouble arises
“F” line
“L” line
5 Add coolant if necessary.
If water was added in an emergency, have the vehicle inspected at any authorized Toyota retailer or Toyota
authorized repairer, or any reliable repairer as soon as possible.
6 After stopping the hybrid system
and waiting for 5 minutes or
more, start the hybrid system
again and check for the multi-
information display.
If the message does not disap-
pear: Stop the hybrid system
and contact any authorized
Toyota retailer or Toyota autho-
rized 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 authorized Toyota retailer or Toyota authorized repairer, or any reliable repairer.
WARNING
■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 “READY”
indicator is off. When the hybrid system is operating, the gasoline engine may automatically start, or
the cooling fan may suddenly oper- ate even if the gasoline engine stops. Do not touch or approach
rotating parts such as the fan, which may lead to fingers or cloth-ing (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 radiator are hot.
High temperature steam or coolant could spray out.
NOTICE
■When adding engine/power con-trol 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 dam- age 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.).

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8-1. Specifications
Vehicle specifications
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.
■Engine oil selection
Gasoline Engine 
“Toyota Genuine Motor Oil” is used
in your Toyota vehicle. Toyota rec-
ommends the use of approved
“Toyota Genuine Motor Oil”.
Another motor oil of matching qual-
ity can also be used.
Oil grade:
0W-8: JASO GLV-1
0W-16:
API grade SN “Resource-Conserv-
ing”, SN PLUS “Resource-Conserv-
ing” or SP “Resource-Conserving”;
or ILSAC GF-6B multigrade engine
oil
0W-20 and 5W-30:
API grade SM “Energy-Conserv-
ing”, SN “Resource-Conserving”,
SN PLUS “Resource-Conserving”;
or SP “Resource-Conserving”; or
ILSAC GF-6A multigrade engine oil
Recommended viscosity (SAE):
Preferred
Temperature range anticipated
before next oil change
SAE 0W-8 is filled into your Toyota
vehicle at manufacturing, and the
best choice for good fuel economy
and good starting in cold weather. If
SAE 0W-8 oil is not available, SAE
0W-16 or 0W-20 oil may be used.
However, it should be replaced with
SAE 0W-8 at the next oil change.
Oil viscosity (0W-8 is explained
here as an example):
• The 0W in 0W-8 indicates the
characteristic of the oil which
allows cold startability. Oils with a
lower value before the W allow
for easier starting of the engine
in cold weather.
• The 8 in 0W-8 indicates the vis-
cosity characteristic of the oil
when the oil is at high tempera-
ture. An oil with a higher viscos-
ity (one with a higher value) may
be better suited if the vehicle is