engine overheat TOYOTA HILUX 2023 Owners Manual

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HILUX_OM_OM0K789E_(EE)
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7-1. Maintenance and care
Cleaning and protecting
the vehicle exterior ..........472
Cleaning and protecting
the vehicle interior ...........476
7-2. Maintenance
Maintenance
requirements....................479
7-3. Do-it-yourself maintenance
Do-it-yourself service
precautions ......................482
Hood ..................................484
Engine compartment..........486
Tires ...................................507
Tire inflation pressure ........510
Wheels ...............................512
Air conditioning filter ..........514
Wireless remote control/
electronic key battery.......516
Checking and
replacing fuses ................520
Light bulbs .........................525
8-1. Essential information
Emergency flashers ...........554
If your vehicle has to
be stopped in an
emergency .......................555
If the vehicle is
submerged or water on
the road is rising ..............557
8-2. Steps to take in an
emergency
If your vehicle needs
to be towed ..................... 559
If you think something is
wrong .............................. 564
Fuel pump shut off
system (gasoline engine
only) ................................ 565
If a warning light turns on
or a warning buzzer
sounds ............................ 566
If a warning message is
displayed ......................... 575
If you have a flat tire .......... 581
If the engine will not
start ................................. 598
If the electronic key does
not operate properly
(vehicles with smart
entry & start system) ....... 600
If the vehicle battery is
discharged ...................... 604
If your vehicle
overheats ........................ 610
If you run out of fuel
and the engine stalls
(diesel engine only) ......... 614
If the vehicle becomes
stuck................................ 615
7Maintenance and care
8When trouble arises

17Pictorial index
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Fuel filler door*1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 260
Refueling method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 260
Fuel type/fuel tank capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 627
Tires . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 507
Tire size/inflation pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 640
Winter tires/tire chain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 373
Checking/rotation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 508
Coping with flat tires . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 581
Hood . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 484
Opening . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 484
Engine oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 628
Coping with overheat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 610
Camera*1, 2
Headlights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 247
Front position lights/daytime running lights*1. . . . . . . . . . P. 247
Front fog lights*1/rear fog light*1, 3. . . . . . . . . . . . . . . . . . . P. 254
Front turn signal lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 245
Side turn signal lights (fender-mounted type or
mirror-mounted type) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 245
Rear turn signal lights. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 245
Stop lights
Downhill assist control system*1. . . . . . . . . . . . . . . . . . . . . . . P. 363
Tail lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 247
License plate light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 247
Back-up lights*3
Shifting the shift lever to R. . . . . . . . . . . . . . . . . . . . . . . . P. 230, 238
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Light bulbs of the exterior lights for driving
(Replacing method: P. 525, Watts: P. 643)
*1: If equipped
*2: Refer to “Navigation and multimedia system Owner’s manual” or
“Multimedia Owner’s Manual”.
*3: They may be located on the opposite side depending on the target region.
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1322. Instrument cluster
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WARNING
■The information display at low temperatures (vehicles with multi-infor-
mation display)
Allow the interior of the vehicle to warm up before using the liquid crystal
information display. At extremely low temperatures, the display monitor may
respond slowly, and display changes may be delayed.
For vehicles with automatic transmission: For example, there is a lag
between the driver’s shifting and the new gear number appearing on the
display. This lag could cause the driver to downshift again, causing rapid
and excessive engine braking and possibly an accident resulting in death or
injury.
NOTICE
■ To prevent damage to the engine and its components
● Do not let the indicator needle of the tachometer enter the red zone, which
indicates the maximum engine speed.
● The engine may be overheating if the engine coolant temperature gauge is
in the red zone (H). In this case, immediately stop the vehicle in a safe
place, and check the engine after it has cooled completely. ( P. 610)

1964-1. Before driving
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WARNING
Observe the following precautions.
Failure to do so may result in death or serious injury.
■ When driving the vehicle
● Use engine braking (downshift) to maintain a safe speed when driving
down a steep hill.
Using the brakes continuously may cause the brakes to overheat and lose
effectiveness. ( P. 2 3 1 )
● Do not adjust the positions of the steering wheel, the seat, or the inside or
outside rear view mirrors while driving.
Doing so may result in a loss of vehicle control.
● Always check that all passengers’ arms, heads or other parts of their body
are not outside the vehicle.
● On vehicles with manual transmission, observe the following to prevent
the clutch from being damaged.
• Do not operate the clutch halfway for a long period of time unless it is
necessary.
• Do not operate the clutch half or partial engaged to control the vehicle
speed, such as to drive the vehicle at a low speed, to hold the vehicle
on a slope, etc.
• Do not depress the brake pedal during operating the clutch half or par-
tial engaged.
Doing so could not only speed up the clutch wear, but also damage the
clutch or even cause a fatal accident such as vehicle fire.
■ When driving on slippery road surfaces
● Sudden braking, acceleration and steering may cause tire slippage and
reduce your ability to control the vehicle.
● Sudden acceleration, engine braking due to shifting, or changes in engine
speed could cause the vehicle to skid.
● After driving through a puddle, lightly depress the brake pedal to make
sure that the brakes are functioning properly. Wet brake pads may prevent
the brakes from functioning properly. If the brakes on only one side are wet
and not functioning properly, steering control may be affected.

1984-1. Before driving
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WARNING
Observe the following precautions.
Failure to do so may result in death or serious injury.
■ When the vehicle is stopped
● Do not race the engine.
If the vehicle is in any gear other than P (vehicles with automatic transmis-
sion only) or N, the vehicle may accelerate suddenly and unexpectedly,
causing an accident.
● On vehicles with automatic transmission, in order to prevent accidents due
to the vehicle rolling away, always keep depressing the brake pedal while
the engine is running, and apply the parking brake as necessary.
● If the vehicle is stopped on an incline, in order to prevent accidents caused
by the vehicle rolling forward or backward, always depress the brake pedal
and securely apply the parking brake as needed.
● Avoid revving or racing the engine.
Running the engine at high speed while the vehicle is stopped may cause
the exhaust system to overheat, which could result in a fire if combustible
material is nearby.
■ When the vehicle is parked
● Do not leave glasses, cigarette lighters, spray cans, or soft drink cans in
the vehicle when it is in the sun.
Doing so may result in the following:
• Gas may leak from a cigarette lighter or spray can, and may lead to a
fire.
• The temperature inside the vehicle may cause the plastic lenses and
plastic material of glasses to deform or crack.
• Soft drink cans may fracture, causing the contents to spray over the
interior of the vehicle, and may also cause a short circuit in the vehicle’s
electrical components.
● Do not leave cigarette lighters in the vehicle. If a cigarette lighter is in a
place such as the glove box or on the floor, it may be lit accidentally when
luggage is loaded or the seat is adjusted, causing a fire.
● Do not attach adhesive discs to the windshield or windows. Do not place
containers such as air fresheners on the instrument panel or dashboard.
Adhesive discs or containers may act as lenses, causing a fire in the vehi-
cle.
● Do not leave a door or window open if the curved glass is coated with a
metallized film such as a silver-colored one. Reflected sunlight may cause
the glass to act as a lens, causing a fire.

1994-1. Before driving
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Driving
HILUX_OM_OM0K789E_(EE)
WARNING
Observe the following precautions.
Failure to do so may result in death or serious injury.
■ When the vehicle is parked
● Always apply the parking brake, shift the shift lever to P (vehicles with
automatic transmission only), stop the engine and lock the vehicle.
Do not leave the vehicle unattended while the engine is running.
If the vehicle is parked with the shift lever in P but the parking brake is not
set, the vehicle may start to move, possibly leading to an accident.
● Do not touch the exhaust pipes while the engine is running or immediately
after turning the engine off.
Doing so may cause burns.
■ When taking a nap in the vehicle
Always turn the engine off. Otherwise, if you accidentally move the shift
lever or depress the accelerator pedal, this could cause an accident or fire
due to engine overheating. Additionally, if the vehicle is parked in a poorly
ventilated area, exhaust gases may collect and enter the vehicle, leading to
death or a serious health hazard.
■ When braking
● When the brakes are wet, drive more cautiously.
Braking distance increases when the brakes are wet, and this may cause
one side of the vehicle to brake differently than the other side. Also, the
parking brake may not securely hold the vehicle.
● If the brake booster device does not operate, do not follow other vehicles
closely and avoid hills or sharp turns that require braking. In this case,
braking is still possible, but the brake pedal should be depressed more
firmly than usual. Also, the braking distance will increase. Have your
brakes fixed immediately.
● Do not pump the brake pedal if the engine stalls.
Each push on the brake pedal uses up the reserve for the power-assisted
brakes.
● The brake system consists of 2 individual hydraulic systems: If one of the
systems fails, the other will still operate. In this case, the brake pedal
should be depressed more firmly than usual and the braking distance will
increase.
Have your brakes fixed immediately.
■ If the vehicle becomes stuck (4WD models)
Do not spin the wheels excessively when any of the tires is up in the air, or
the vehicle is stuck in sand, mud, etc. This may damage the driveline com-
ponents or propel the vehicle forward or backward, causing an accident.

2094-1. Before driving
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Driving
HILUX_OM_OM0K789E_(EE)
■Important points regarding stability
Vehicle movement resulting from uneven road surfaces and strong
crosswinds will affect handling. The vehicle may also be rocked by
passing buses or large trucks. Frequently check behind when mov-
ing alongside such vehicles. As soon as such vehicle movement
occurs, immediately start to decelerate smoothly by slowly applying
the brakes. Always steer the vehicle straight ahead while braking.
■Passing other vehicles
Consider the total combined length of your vehicle and trailer and
ensure that the vehicle-to-vehicle distance is sufficient before exe-
cuting lane changes.
■Transmission information
Vehicles with manual transmission: To maintain engine braking effi-
ciency when using engine braking, do not use 5th gear and 6th
gear.
Vehicles with automatic transmission: To maintain engine braking
efficiency when using engine braking, do not use the transmission
in D. Transmission shift range position must be in 4 or lower, in S
mode.
■If the engine overheats
Towing a loaded trailer up a long, steep incline in temperatures
exceeding 30 C (85F) may result in the engine overheating. If the
engine coolant temperature gauge indicates that the engine is over-
heating, turn the air conditioning off immediately, leave the road and
stop the vehicle in a safe place. ( P. 610)
■When parking the vehicle
Always place wheel chocks under the wheels of both the vehicle
and trailer. Firmly set the parking brake and shift the shift lever to P
for automatic transmissions, and 1 or R for manual transmissions.

2214-2. Driving procedures
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Driving
HILUX_OM_OM0K789E_(EE)
■ When the steering lock cannot be released
■ Key reminder function
A buzzer sounds if the driver’s door is opened while the engine switch is in
the “LOCK” or “ACC” position to remind you to remove the key.
When starting the engine, the engine
switch may seem stuck in the “LOCK”
position. To free it, turn the key while turn-
ing the steering wheel slightly left and
right.
WARNING
■ When starting the engine
Always start the engine while sitting in the driver’s seat. Do not depress the
accelerator pedal while starting the engine under any circumstances.
Doing so may cause an accident resulting in death or serious injury.
■ Caution when driving
Do not turn the engine switch to the “LOCK” position while driving.
If in an emergency, you must turn the engine off while the vehicle is moving,
turn the engine switch only to the “ACC” position to stop the engine. An
accident may result if the engine is stopped while driving. ( P. 555)
NOTICE
■To prevent battery discharge
Do not leave the engine switch in the “ACC” or “ON” position for long peri-
ods of time without the engine running.
■ When starting the engine
● Do not crank the engine for more than 30 seconds at a time. This may
overheat the starter and wiring system.
● Do not race a cold engine.
● If the engine becomes difficult to start or stalls frequently, have your vehi-
cle checked by any authorized Toyota retailer or Toyota authorized
repairer, or any reliable repairer immediately.

2274-2. Driving procedures
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Driving
HILUX_OM_OM0K789E_(EE)
■ Steering lock (vehicles with manual transmission)
After turning the engine switch off and opening and closing the doors, the
steering wheel will be locked due to the steering lock function. Operating the
engine switch again automatically cancels the steering lock.
■ When the steering lock cannot be released (vehicles with manual trans-
mission)
■ Steering lock motor overheating prevention (vehicles with manual trans-
mission)
To prevent the steering lock motor from overheating, the motor may be sus-
pended if the engine is turned on and off repeatedly in a short period of time.
In this case, refrain from running the engine. After about 10 seconds, the
steering lock motor will resume functioning.
■ If “Smart Entry & Start System malfunction See owner’s manual” is
shown on the multi-information display
The system may be malfunctioning. Have the vehicle inspected by any autho-
rized Toyota retailer or Toyota authorized repairer, or any reliable repairer
immediately.
■ If the electronic key battery is depleted
 P. 516
■ If the smart entry & start system has been deactivated in a customized
setting
 P. 600
A message will be displayed on the multi-
information display.
Press the engine switch while turning the
steering wheel left and right.

3644-5. Using the driving support systems
HILUX_OM_OM0K789E_(EE)
■Operating tips (vehicles with automatic transmission)
The system will operate when the shift lever is in a position other than P, how-
ever to make effective use of the system it is recommended to select a lower
shift range.
■ The system will not operate when
● The transfer mode is in H2.
● The rear differential is locked. (if equipped)
■ If the downhill assist control system indicator flashes
● In the following situations, the indicator flashes and the system will not oper-
ate:
• The transfer mode is not in L4 or H4.
• The rear differential is locked. (if equipped)
• The shift lever is in P. (vehicles with automatic transmission)
• The accelerator or brake pedal is depressed.
• The vehicle speed exceeds approximately 30 km/h (18 mph).
• The brake system overheats.
● In the following situations, the indicator flashes to alert the driver, but the
system will operate:
• The shift lever is in N. (vehicles with automatic transmission)
• The clutch pedal is depressed. (vehicles with manual transmission)
• The “DAC” switch is turned off while the system is operating.
The system will gradually ceases operat ion. The indicator will flash during
operation, and then go off when the system is fully off.
■ When the downhill assist control system is operated continuously
This may cause the brake actuator to overheat. In this case, the downhill
assist control system will stop operating, a buzzer will sound and the downhill
assist control system indicator will start flashing, and “TRC turned off” will be
shown on the multi-information display. Refrain from using the system until
the downhill assist control system indicator stays on and the message goes
off. (The vehicle can be driven normally during this time.)
■ Sounds and vibrations caused by the downhill assist control system
● A sound may be heard from the engine compartment when the engine is
started or just after the vehicle begins to move. This sound does not indicate
that a malfunction has occurred in downhill assist control system.
● Either of the following conditions may occur when the downhill assist control
system is operating. None of these are indicators that a malfunction has
occurred.
• Vibrations may be felt through the vehicle body and steering.
• A motor sound may be heard after the vehicle comes to a stop.