Toyota Highlander (2018 year). Manual - part 125

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7-2. Maintenance

Vehicle exterior

Items

Check points

Doors

• Do the doors operate smoothly?

Engine hood

• Does the engine hood lock system work prop-

erly?

Fluid leaks

• There should not be any signs of fluid leakage

after the vehicle has been parked.

Tires

• Is the tire inflation pressure correct?
• The tires should not be damaged or exces-

sively worn.

• Have the tires been rotated according to the

maintenance schedule?

• The wheel nuts should not be loose.

Windshield wipers/rear
window wiper

• The wiper blades should not show any signs

of cracking, splitting, wear, contamination or
deformation.

• The wiper blades should clear the windshield/

rear window without streaking or skipping.

WARNING

■

If the engine is running
Turn the engine off and ensure that there is adequate ventilation before per-
forming maintenance checks.

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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 disconnected or discharged

Readiness codes that are set during ordinary driving are erased.
Also, depending on your driving habits, the readiness codes may
not be completely set.

● When the fuel tank cap is loose

The malfunction indicator lamp comes on indicating a temporary
malfunction and your vehicle may not pass the I/M test.

The error code in the OBD system will not be cleared unless the vehi-
cle is driven 40 or more times.

Contact your Toyota dealer to prepare the vehicle for re-testing.

Emission inspection and maintenance (I/M) 

programs

Some states have vehicle emission inspection programs which
include OBD (On Board Diagnostics) checks. The OBD system
monitors the operation of the 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

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7-3. Do-it-yourself maintenance

Do-it-yourself service precautions

If you perform maintenance by yourself, be sure to follow the
correct procedure as given in these sections.

Items

Parts and tools

Battery condition
(

→P. 527)

• Warm water

• Baking soda

• Grease

• Conventional wrench (for terminal clamp bolts)

Brake fluid level
(

→P. 526)

• 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. 524)

• “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 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 engine coolant)

Engine oil level
(

→P. 521)

• “Toyota Genuine Motor Oil” or equivalent
• Rag or paper towel
• Funnel (used only for adding engine oil)

Fuses (

→P. 552)

• Fuse with same amperage rating as original

Light bulbs
(

→P. 556)

• Bulb with same number and wattage rating as origi-

nal

• Phillips-head screwdriver

• Flathead screwdriver

• Wrench

Radiator and con-
denser (

→P. 525)

⎯

Tire inflation
pressure 
(

→P. 542)

• Tire pressure gauge
• Compressed air source

Washer fluid 
(

→P. 530)

• Water or washer fluid containing antifreeze (for win-

ter use)

• Funnel (used only for adding water or washer fluid)

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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 fans 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 rags, in the
engine compartment.

●

Do not smoke, cause sparks or expose an open flame to fuel or the bat-
tery. Fuel and battery fumes are flammable.

●

Be extremely cautious when working on the battery. It contains poisonous
and corrosive sulfuric acid.

■

When working near the electric cooling fans or radiator grille
Vehicles without a smart key system: 
Be sure the engine switch is off. 
With the engine switch in the “ON” position, the electric cooling fans may
automatically start to run if the air conditioning is on and/or the coolant tem-
perature is high. (

→P. 525)

Vehicles with a smart key system: 
Be sure the engine switch is off. 
With the engine switch in IGNITION ON mode, the electric cooling fans may
automatically start to run if the air conditioning is on and/or the coolant tem-
perature is high. (

→P. 525)

■

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.