2023 TOYOTA 4RUNNER battery

4056-2. Maintenance
6
Maintenance and care
4RUNNER (U)
General maintenance
Listed below are the general maintenance items that should be
performed at the intervals specified in the “Owner’s Warranty
Information Booklet” or “Own er’s Manual Supplement/Sched-
uled Maintenance Guide”. It is recommended that any problem
you notice should be brought to the attention of your Toyota
dealer or qualified s ervice shop for advice.
Engine compartment
ItemsCheck points
BatteryCheck the connections. (P. 422)
Brake fluidIs the brake fluid at the correct level? ( P. 419)
Engine coolantIs the engine coolant at the correct level? ( P. 417)
Engine oilIs the engine oil at the correct level? (P. 415)
Exhaust systemThere should not be any fumes or strange sounds.
Power steering fluidIs the power steering fluid at the correct level?
(P. 421)
Radiator/condenserThe radiator and condenser should be free from
foreign objects. ( P. 419)
Washer fluidIs there sufficient washer fluid? (P. 425)

4086-2. Maintenance
4RUNNER (U)
The OBD system determines that a problem exists somewhere in the
emission control system. Your vehicle may not pass the I/M test and
may need to be repaired. Contact your Toyota dealer to service the
vehicle.
● When the battery is disc onnected or discharged
Readiness codes that are set duri ng ordinary driving are erased.
Also, depending on your driving habits, the readiness codes may
not be completely set.
● When the fuel tan k cap is loose
The malfunction indicator lamp comes on indicating a temporary
malfunction and your vehicle m ay not pass the I/M test.
The error code in th e OBD system will not be cleared unless the vehi-
cle is driven 40 or more times.
Contact your Toyota dea ler to prepare the vehicle for re-testin g.
Emission inspection and maintenance (I/M)
programs
Some states have vehicle emission inspection programs which
include OBD (On Board Diagnos tics) checks. The OBD system
monitors the operation of t he emission control system.
If the malfunction indicator lamp comes on
Your vehicle may not pass the I/M test in the following situations:
When the malfunction indicator lamp still remains on after sev-
eral driving trips
If your vehicle does not pass the I/M test

409
6
Maintenance and care
4RUNNER (U)
6-3. Do-it-yourself maintenance
Do-it-yourself ser vice precautions
If you perform maintenance by yourself, be sure to follow the
correct procedure as given in these sections.
ItemsParts and tools
Battery condition (P. 422)
• Warm water• Baking soda
•Grease
• Conventional wrench (for terminal clamp bolts)
Brake fluid level
(P. 419)
• FMVSS No.116 DOT 3 or SAE J1703 brake
fluid
• Rag or paper towel
• Funnel (used only for adding brake fluid)
Engine coolant level (P. 417)
• “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
For the U.S.A.:
“Toyota Super Long Life Coolant” is pre-mixed
with 50% coolant and 50% deionized water.
For Canada:
“Toyota Super Long Life Coolant” is pre-mixed
with 55% coolant and 45% deionized water.
• Funnel (used only for adding coolant)
Engine oil level (P. 415)
• “Toyota Genuine Motor Oil” or equivalent
• Rag or paper towel
• Funnel (used only for adding engine oil)

4116-3. Do-it-yourself maintenance
6
Maintenance and care
4RUNNER (U)
WARNING
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
● Keep hands, clothing and tools away from the moving fan and engine
drive belt.
● Be careful not to touch the engine, 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 r ags, in the
engine compartment.
● Do not smoke, cause sparks or expose an open flame to fuel or t he bat-
tery. Fuel and battery fumes are flammable.
● Be extremely cautious when working on the battery. It contains poisonous
and corrosive sulfuric acid.
■ 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.

4136-3. Do-it-yourself maintenance
6
Maintenance and care
4RUNNER (U)
Engine compartment
Washer fluid tank (P. 425)
Power steering fluid reservoir ( P. 421)
Engine oil level dipstick ( P. 415)
Engine coolant reservoir ( P. 417)
Engine oil filler cap ( P. 416)Brake fluid reservoir
( P. 419)
Fuse box ( P. 450)
Battery ( P. 422)
Condenser ( P. 419)
Radiator ( P. 419)1
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4226-3. Do-it-yourself maintenance
4RUNNER (U)
Check the battery as follows.
■Battery exterior
Make sure that the battery terminals are not corroded and that
there are no loose connections, cracks, or loose clamps.Terminals
Hold-down clamp
■Before recharging
When recharging, the battery produces hydrogen gas which is fla mmable and
explosive. Therefore, observe the following before recharging:
● If recharging with the battery installed on the vehicle, be sur e to disconnect
the ground cable.
● Make sure the power switch on the charger is off when connectin g and dis-
connecting the charger cables to the battery.
WARNING
■ When checking the reservoir
Take care as the reservoir may be hot.
NOTICE
■When adding fluid
Avoid overfilling, or the power steering may be damaged.
■ After replacing the reservoir cap
Check the steering box case, vane pump and hose connections for leaks or
damage.
Battery
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4236-3. Do-it-yourself maintenance
6
Maintenance and care
4RUNNER (U)■
After recharging/reco nnecting the battery
The engine may not start. Follow the procedure below to initialize the system.
Shift the shift lever to P.
Open and close any of the doors.
Restart the engine.
● Unlocking the doors using the smart key system may not be possible imme-
diately after reconnecting the battery. If this happens, use the wireless
remote control or the mechanical key to lock/unlock the doors.
● Start the engine with the engine switch in ACCESSORY mode. The engine
may not start when the engine switch turned from off. However, the engine
will operate normally from the second attempt.
● The engine switch mode is recorded by the vehicle. If the battery is recon-
nected, the vehicle will return the engine switch mode to the s tatus it was in
before the battery was disconnected. Make sure to turn off the engine
before disconnect the battery. Take extra care when connecting the battery
if the engine switch mode prior to discharge is unknown.
If the system will not start even after multiple attempts, contact your Toyota
dealer.
WARNING
■ Chemicals in the battery
Batteries contain poisonous and corrosive sulfuric acid and may produce
hydrogen gas which is flammable and explosive. To reduce the ri sk of death
or serious injury, take the following precautions while working on or near the
battery:
● Do not cause sparks by touching the battery terminals with tools.
● Do not smoke or light a match near the battery.
● Avoid contact with eyes, skin and clothes.
● Never inhale or swallow electrolyte.
● Wear protective safety glasses when working near the battery.
● Keep children away from the battery.
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4246-3. Do-it-yourself maintenance
4RUNNER (U)
WARNING
■Where to safely charge the battery
Always charge the battery in an open area. Do not charge the battery in a
garage or closed room where there is insufficient ventilation.
■ How to recharge the battery
Only perform a slow charge (5 A or less). The battery may explo de 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 ge t immedi-
ate medical attention. If possible, continue to apply water wit h 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.
NOTICE
■When recharging the battery
Never recharge the battery while the engine is running. Also, be sure all
accessories are turned off.