check engine TOYOTA HILUX 2023 Service Manual

4917-3. Do-it-yourself maintenance
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Maintenance and care
■After changing the engine oil (models for model code destination W*)
The engine oil maintenance data should be reset. Perform the following pro-
cedures:
Switch the display to the trip meter A ( P. 130) when the engine switch is
in the “ON” position (vehicles without smart entry & start system) or IGNI-
TION ON mode (vehicles with smart entry & start system).
Turn the engine switch to the “LOCK” position (vehicles without smart entry
& start system) or off (vehicles with smart entry & start system).
While pressing the odometer/trip meter display change button ( P. 130),
turn the engine switch to the “ON” position (vehicles without smart entry &
start system) or IGNITION ON mode (vehicles with smart entry & start sys-
tem). (Do not start the engine because reset mode will be canceled.) Con-
tinue to press and hold the button for more than one second after the trip
meter displays “000000”.
*: See “Checking your vehicle’s model” if you are not sure of which model
your vehicle is. ( P. 1 2 )
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 any authorized Toyota reta iler or Toyota authorized repairer,
or any reliable repairer, 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.
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4937-3. Do-it-yourself maintenance
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7
Maintenance and care
■If the coolant level drops within a short time of replenishing
Visually check the radiator, hoses, engine coolant reservoir cap, intercooler
coolant reservoir cap (if equipped), 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.
Check the radiator, condenser and intercooler coolant radiator/inter-
cooler and clear away any foreign objects. If any of the above parts is
extremely dirty or you are not sure of their condition, have your vehi-
cle inspected by any authorized Toyota retailer or Toyota authorized
repairer, or any reliable repairer.
WARNING
■ When the engine is hot
Do not remove the radiator cap (if equipped), the engine coolant reservoir
cap or intercooler coolant reservoir cap (if equipped).
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 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.
■ Notice on coolant quality
Do not use improper coolant. If improper coolant is used, the engine cooling
system may be damaged.
Radiator, condenser and intercooler coolant radiator/intercooler
(if equipped)
WARNING
■ When the engine is hot
Do not touch the radiator, condenser or intercooler coolant radiator/inter-
cooler as they may be hot and cause serious injuries, such as burns.

4997-3. Do-it-yourself maintenance
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7
Maintenance and care
You may drain the fuel filter yourself. However, as the operation is dif-
ficult, we recommend having it drained by any authorized Toyota
retailer or Toyota authorized repairer, or any reliable repairer. Even if
you decide to drain it yourself, contact any authorized Toyota retailer
or Toyota authorized repairer, or any reliable repairer.
The water in the fuel filter needs to be drained if one of the following
symptoms occurs:
Vehicles without multi-information display
When the fuel system warning light flashes and a buzzer sounds.
( P. 569)
Vehicles with multi-information display
When “Water accumulation in fuel filter See owner’s manual” is
shown on the multi-information display and a buzzer sounds*1.
Vehicles without smart entry & start system: Turn the engine switch
to the “LOCK” position.
Vehicles with smart entry & start system: Turn the engine switch off.
Place a small tray under the drain plug or drain hose to catch the
water and any fuel that comes out.
Perform the draining as shown in the illustration.
Turn the drain plug counter-
clockwise about 2 to 2 1/2
turns.
Loosening more than this will
cause water oozing from around
the drain plug.
Operate the priming pump
until fuel begins to run out.
After draining, tighten the drain plug by hand.
*1: Models for model code destination Blank*2
*2: See “Checking your vehicle’s model” if you are not sure of which model
your vehicle is. ( P. 1 2 )
Fuel filter (diesel engine only)
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5037-3. Do-it-yourself maintenance
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Maintenance and care
■Refilling AdBlue™ by yourself in an emergency
When the engine cannot be restarted due to the depletion of
AdBlue™, adding approximately 11.0 L (11.6 qt., 9.7 Imp.qt.) or
more of AdBlue™ will allow the engine to be started again. Perform
the following procedures to refill AdBlue™. (The AdBlue™ tank has
a capacity of 17.0 L [18.0 qt., 15.0 Imp.qt.].)
Refilling with the refilling equipment
Park the vehicle on a level surface, turn the engine switch off,
and then open the hood. ( P. 484)
Open the AdBlue™ tank cap.
Insert the nozzle and refill
AdBlue™.
Refill AdBlue™ slowly so that it
does not spill.
Close the AdBlue™ tank cap.
Turn the cap until you hear a
click.
Check that the engine starts.
Have AdBlue™ refilled to the full at any authorized Toyota retailer or
Toyota authorized repairer, or any reliable repairer.
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5047-3. Do-it-yourself maintenance
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Refilling with the bottle
Park the vehicle on a level surface, turn the engine switch off,
and then open the hood. ( P. 484)
Open the AdBlue™ tank cap.
Insert a bottle of AdBlue™
and fully tighten it.
Push down on the bottle.
AdBlue™ will begin to be
refilled. Refill AdBlue™ slowly
so that it does not spill. Do not
remove the bottle until it is
empty.
Check that no AdBlue™
remains in the bottle, and
then remove it.
Repeat steps 3 to 5 until approx-
imately 11.0 L (11.6 qt., 9.7
Imp.qt.) or more of AdBlue™
have been refilled.
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5057-3. Do-it-yourself maintenance
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Maintenance and care
Close the AdBlue™ tank cap.
Turn the cap until you hear a
click.
Check that the engine starts.
The way of refilling may differ from those shown in the illustration.
Have AdBlue™ refilled to the full at any authorized Toyota retailer
or Toyota authorized repairer, or any reliable repairer.
■ Refilling AdBlue™
● Use AdBlue™ (compliant with ISO 22241-1).
AdBlue™ is a trademark of the German Association of the Automotive
Industry (VDA).
● Before driving for a long period of time in an area where AdBlue™ cannot
be refilled, consult any authorized Toyota retailer or Toyota authorized
repairer, or any reliable repairer.
■ When refilling AdBlue™
After refilling AdBlue™, the engine may take a few seconds longer than nor-
mal to start.
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5207-3. Do-it-yourself maintenance
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Checking and replacing fuses
Vehicles without smart entry & start system:
Turn the engine switch to the “LOCK” position.
Vehicles with smart entry & start system:
Turn the engine switch off.
Open the fuse box cover.
In the engine compartment
Push the tab in and pull the lock
release, and lift the lid off.
Under the instrument panel (left-hand drive vehicles)
Remove the lid.
If any of the electrical components do not operate, a fuse may
have blown. If this happens, check and replace the fuses as nec-
essary.
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5668-2. Steps to take in an emergency
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If a war ning light tur ns on or a warning
buzzer sounds
Calmly perform the following actions if any of the warning lights
comes on or flashes. If a light comes on or flashes, but then
goes off, this does not necessarily indicate a malfunction in the
system. However, if this continues to occur, have the vehicle
inspected by any authorized Toyota retailer or Toyota authorized
repairer, or any reliable repairer.
Warning light and warning buzzer list
Warning lightWarning light/Details/Actions
Brake system warning light (warning buzzer)
Indicates:
• Low brake fluid
• Malfunction in the brake system
• Low negative pressure in the vacuum tank (diesel
engine)
 Immediately stop the vehicle in a safe place and con-
tact any authorized Toyota retailer or Toyota autho-
rized repairer, or any reliable repairer. Continuing to
drive the vehicle may be dangerous.
Charging system warning light*1 (if equipped)
Indicates a malfunction in the vehicle’s charging system
 Immediately stop the vehicle in a safe place and con-
tact any authorized Toyota retailer or Toyota autho-
rized repairer, or any reliable repairer.
Low engine oil pressure warning light (warning
buzzer)*1, 2 (if equipped)
Indicates that the engine oil pressure is too low (This
warning light may come on if the vehicle is stopped on a
slope. Move to a level surface and check to see if the light
goes off.)
 Immediately stop the vehicle in a safe place and con-
tact any authorized Toyota retailer or Toyota autho-
rized repairer, or any reliable repairer.

5708-2. Steps to take in an emergency
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(Yellow)
LDA indicator (warning buzzer) (if equipped)
Indicates a malfunction in the LDA (Lane Departure Alert
with Yaw Assist Function)
 Follow the instructions displayed on the multi-infor-
mation display. ( P. 293)
Open door warning light (warning buzzer)*1, 7 (if
equipped)
Indicates that a door is not fully closed
 Check that all the doors are closed.
(Flashes or illuminates)
Driver’s and front passenger’s seat belt reminder light
(warning buzzer)*8
Warns the driver and front passenger to fasten his/her
seat belt
 Fasten the seat belt.
(Flashes or illuminates)or
(Flashes or illuminates)
Rear passengers’ seat belt reminder lights (warning
buzzer)*9 (if equipped)
Warn the rear passengers to fasten their seat belts
 Fasten the seat belt.
Low fuel level warning light
Indicates remaining fuel is approximately 12.0 L (3.2 gal.,
2.6 Imp.gal.) or less
 Refuel the vehicle.
Low engine oil level warning light (if equipped)
Indicates that engine oil level is low (This warning light
may come on if the vehicle is stopped on a slope. Move
the vehicle to a level surface and check to see if the light
goes off.)
 Check the level of engine oil and add more oil if nec-
essary.
(Flashes or illuminates)
Master warning light (warning buzzer) (if equipped)
A buzzer sounds and the warning light comes on and
flashes to indicate that the master warning system has
detected a malfunction.
 P. 575
Warning lightWarning light/Details/Actions

5748-2. Steps to take in an emergency
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WARNING
■If a warning light comes on or a warning buzzer sounds when a warn-
ing message is shown on the multi-information display (vehicles with
multi-information display)
Check and follow the message shown on the multi-information display. Fail-
ure to do so may result in death or serious injury.
■ If both the ABS and the brake system warning lights remain on
Stop your vehicle in a safe place immediately and contact any authorized
Toyota retailer or Toyota authorized r epairer, or any reliable repairer. The
vehicle will become extremely unstable during braking, and the ABS system
may fail, which could cause an accident resulting in death or serious injury.
NOTICE
■ If the malfunction indicator lamp comes on when the boost pressure in
the turbocharger is abnormally high (diesel engine)
Never drive at high speed or race the engine even after the lamp goes off.
■ If the fuel system warning light flashes (diesel engine)
Never drive the vehicle with the warn ing light flashing. Continued driving
with water accumulated in the fuel filter will damage the fuel injection pump.