Lexus GX460 (2023 year). Manual in english - page 18

GX460_OM_OM60R43U_(U)

When trouble

WARNING

■

When using the mechanical key and operating the power windows or moon roof

Operate the power window or moon roof after checking to make sure that there is no

possibility of any passenger having any of their body parts caught in the window or

moon roof.
Also, do not allow children to operate the mechanical key. It is possible for children and

other passengers to get caught in the power window or moon roof.

570

GX460_OM_OM60R43U_(U)

If the vehicle battery is discharged

If you have a set of jumper (or booster) cables and a second vehicle with a 12-volt
battery, you can jump start your Lexus by following the steps below.

Confirm that the electronic key is
being carried.

When connecting the jumper (or

booster) cables, depending on the situa-

tion, the alarm may activate and the

doors locked. (



P. 78)

Open the hood. (

P. 474)

Connecting the jumper cables according to the following procedure:

Positive (+) battery terminal on your vehicle.
Positive (+) battery terminal on the second vehicle.
Negative (-) battery terminal on the second vehicle.
Connect the jumper cable to ground on your vehicle as shown in the illus-
tration.

The following procedures may be used to start the engine if the vehicle’s bat-
tery is discharged.
You can call your Lexus dealer, or qualified repair shop.

2
3

2
3
4

571

GX460_OM_OM60R43U_(U)

When trouble

Start the engine of the second vehicle. Increase the engine speed slightly and
maintain at that level for approximately 5 minutes to recharge the battery of
your vehicle.
Maintain the engine speed of the second vehicle and start the engine of your
vehicle by turning the engine switch to IGNITION ON mode.
Once your vehicle’s engine has started, remove the jumper cables in the exact
reverse order in which they were connected.

Once the engine starts, have the vehicle checked at your Lexus dealer as soon
as possible.

■

Starting the engine when the battery is discharged

The engine cannot be started by push-starting.

■

To prevent battery discharge

●

Turn off the headlights and the audio system while the engine is off.

●

Turn off any unnecessary electrical components when the vehicle is running at a low

speed for an extended period, such as in heavy traffic.

■

Charging the battery

The electricity stored in the battery will discharge gradually even when the vehicle is not

in use, due to natural discharge and the draining effects of certain electrical appliances. If

the vehicle is left for a long time, the battery may discharge, and the engine may be

unable to start. (The battery recharges automatically during driving.)

■

When recharging or replacing the battery

●

In some cases, it may not be possible to unlock the doors using the smart access system

with push-button start when the battery is discharged. Use the wireless remote control

or the mechanical key to lock or unlock the doors.

●

The engine may not start on the first attempt after the battery has recharged but will

start normally after the second attempt. This is not a malfunction.

●

The engine switch mode is memorized by the vehicle. When the battery is recon-

nected, the system will return to the mode it was in before the battery was discharged.

Before disconnecting the battery, turn the engine switch off. If you are unsure what

mode the engine switch was in before the battery discharged, be especially careful

when reconnecting the battery.

572

GX460_OM_OM60R43U_(U)

WARNING

■

Avoiding battery fires or explosions

Observe the following precautions to prevent accidentally igniting the flammable gas

that may be emitted from the battery:

●

Make sure the jumper cable is connected to the correct terminal and that it is not

unintentionally in contact with any other than the intended terminal.

●

Do not allow the + and - clamps of the jumper cables to come into contact with each

other.

●

Do not smoke, use matches, cigarette lighters or allow open flame near the battery.

■

Battery precautions

The battery contains poisonous and corrosive acidic electrolyte, while related parts

contain lead and lead compounds. Observe the following precautions when handling

the battery:

●

When working with the battery, always wear safety glasses and take care not to allow

any battery fluids (acid) to come into contact with skin, clothing or the vehicle body.

●

Do not lean over the battery.

●

In the event that battery fluid comes into contact with the skin or eyes, immediately

wash the affected area with water and seek medical attention.

Place a wet sponge or cloth over the affected area until medical attention can be

received.

●

Always wash your hands after handling the battery support, terminals, and other bat-

tery-related parts.

●

Do not allow children near the battery.

NOTICE

■

When handling jumper cables

When connecting the jumper cables, ensure that they do not become entangled in the

cooling fans or belt.

573

GX460_OM_OM60R43U_(U)

When trouble

If your vehicle overheats

Stop the vehicle in a safe place and turn off the air conditioning system, and
then stop the engine.
If you see steam:
Carefully lift the hood after the steam subsides.
If you do not see steam:
Carefully lift the hood.
After the engine has cooled down sufficiently, inspect the hoses and radiator
core (radiator) for any leaks.

Radiator
Cooling fans

If a large amount of coolant leaks,

immediately contact your Lexus

dealer.

The following may indicate that your vehicle is overheating.

●

The needle of the engine coolant temperature gauge (

P. 88) enters the

red zone or a loss of engine power is experienced. (For example, the vehicle
speed does not increase.)

●

Steam is coming from under the hood.

Correction procedures

574

GX460_OM_OM60R43U_(U)

The coolant level is satisfactory if it is between the “F” and “L” lines on the res-
ervoir.

Reservoir
“F”
“L”
Radiator cap

Add coolant if necessary.

Water can be used in an emergency if

coolant is unavailable.

Start the engine and turn the air conditioning system on to check that the radi-
ator cooling fans operate and to check for coolant leaks from the radiator or
hoses.

The fans operate when the air conditioning system is turned on immediately after a

cold start. Confirm that the fans are operating by checking the fan sound and air flow.

If it is difficult to check these, turn the air conditioning system on and off repeatedly.

(The fans may not operate in freezing temperatures.)

If the fans are not operating:
Stop the engine immediately and contact your Lexus dealer.
If the fans are operating:
Have the vehicle inspected at the nearest Lexus dealer.

2
3
4

575

GX460_OM_OM60R43U_(U)

When trouble

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.

●

Keep hands and clothing (especially a tie, a scarf or a muffler) away from the fans and

belts. Failure to do so may cause the hands or clothing to be caught, resulting in seri-

ous injury.

●

Do not loosen the radiator cap or the coolant reservoir cap while the engine and radi-

ator are hot. High temperature steam or coolant could spray out.

NOTICE

■

When adding engine coolant

Add coolant slowly after the engine has cooled down sufficiently. Adding cool coolant

to a hot engine too quickly can cause damage to the engine.

■

To prevent damage to the cooling system

Observe the following precautions:

●

Avoid contaminating the coolant with foreign matter (such as sand or dust etc.).

●

Do not use any coolant additive.

576

GX460_OM_OM60R43U_(U)

If the vehicle becomes stuck

Stop the engine. Set the parking brake and shift the shift lever to P.
Remove the mud, snow or sand from around the stuck tire.
Place wood, stones or some other material under the tires to help provide
traction.
Restart the engine.
Lock the center differential. (



P. 358)

Shift the shift lever to the D or R position and release the parking brake. Then,
while exercising caution, depress the accelerator pedal.

■

When it is difficult to free the vehicle

Turn off TRAC/Active TRAC/VSC/Trailer Sway Control if these functions are hamper-

ing your attempts to free the vehicle. (

P. 370)

Carry out the following procedures if the tires spin or the vehicle becomes
stuck in mud, dirt, or snow:

Press to turn off TRAC/Active TRAC/VSC/

Trailer Sway Control.

2
3

4
5
6

577

GX460_OM_OM60R43U_(U)

When trouble

WARNING

■

When attempting to free a stuck vehicle

If you choose to push the vehicle back and forth to free it, make sure the surrounding

area is clear, to avoid striking other vehicles, objects or people. The vehicle may also

lunge forward or lunge back suddenly as it becomes free. Use extreme caution.

■

When shifting the shift lever

Be careful not to shift the shift lever with the accelerator pedal depressed.

This may lead to unexpected rapid acceleration of the vehicle that may cause an acci-

dent and result in death or serious injury.

NOTICE

■

To avoid damaging the transmission and other components

●

Avoid spinning the wheels and depressing the accelerator pedal more than neces-

sary.

●

If the vehicle remains stuck even after these procedures are performed, the vehicle

may require towing to be freed.

●

When a warning message for the automatic transmission fluid temperature is dis-

played while attempting to free a stuck vehicle, immediately remove your foot from

the accelerator pedal and wait until the warning message disappears. Otherwise, the

transmission may become damaged. (

P. 545)

580

GX460_OM_OM60R43U_(U)

Maintenance data (fuel, oil level, etc.)

: Unladen vehicles

: Vehicles without roof rails

: Vehicles with flat type roof rails

: Vehicles with bridge type roof rails

: Vehicles without rear height control air suspension

: Vehicles with rear height control air suspension

Dimensions and weights

Overall length

189.2 in. (4880 mm)

Overall width

74.2 in. (1885 mm)

Overall height

Without shark fin antenna

71.7 in. (1820 mm)

2, 6

72.0 in. (1830 mm)

2, 5

72.2 in. (1835 mm)

3, 6

72.6 in. (1845 mm)

3, 5

74.2 in. (1885 mm)

4, 5

With shark fin antenna

73.8 in. (1875 mm)

74.2 in. (1885 mm)

Wheelbase

109.8 in. (2790 mm)

Front and rear tread

62.4 in. (1585 mm)

Vehicle capacity weight

(Occupants + luggage)

1280 lb. (580 kg)

1315 lb. (595 kg)

TWR (trailer weight +

cargo weight) (With

towing hitch)

With brake

6500 lb. (2950 kg)

Without brake

1000 lb. (453 kg)

Seating capacity

7-passenger models

6-passenger models

7 (Front 2, Rear 5)

6 (Front 2, Rear 4)

GX460_OM_OM60R43U_(U)

581

■

Vehicle identification number

The vehicle identification number (VIN) is the legal identifier for your vehicle.
This is the primary identification number for your Lexus. It is used in register-
ing the ownership of your vehicle.
This number is stamped on the front
right frame.

This number is also stamped on the
top left of the instrument panel.

This number is also on the Certifica-
tion label on the left-hand side cen-
ter pillar.

Vehicle identification

582

GX460_OM_OM60R43U_(U)

■

Engine number

The engine number is stamped on
the engine block as shown.

: The engine oil capacity is a reference quantity to be used when changing the engine

oil. Warm up and turn off the engine, wait more than 5 minutes, and check the oil level
on the dipstick.

Engine

Model

4.6 L 8-cylinder (1UR-FE)

Type

8-cylinder V type, 4-cycle, gasoline

Bore and stroke

3.70



3.27 in. (94.0



83.0 mm)

Displacement

281.2 cu.in. (4608 cm

)

Valve clearance

Automatic adjustment

Drive belt tension

Automatic adjustment

Fuel

Fuel type

Unleaded gasoline only

Octane rating

91 (Research Octane Number 96) or higher

Fuel tank capacity (Reference)

23.0 gal. (87 L, 19.1 Imp.gal.)

Lubrication system

Oil capacity

(Drain and refill — reference

)

With filter

Without filter

8.2 qt. (7.8 L, 6.9 Imp.qt.)

7.8 qt. (7.4 L, 6.5 Imp.qt.)

GX460_OM_OM60R43U_(U)

583

■

Engine oil selection

“Toyota Genuine Motor Oil” is used in your Lexus vehicle. Use Lexus
approved “Toyota Genuine Motor Oil” or equivalent to satisfy the following
grade and viscosity.
Oil grade:
ILSAC GF-6A multigrade engine oil

Recommended viscosity:
SAE 0W-20
SAE 0W-20 is the best choice for
good fuel economy and good start-
ing in cold weather.
If SAE 0W-20 is not available, SAE
5W-20 oil may be used. However, it
must be replaced with SAE 0W-20
at the next oil change.
Oil viscosity (0W-20 is explained here as an example):

• The 0W in 0W-20 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 20 in 0W-20 indicates the viscosity characteristic of the oil when the

oil is at high temperature. An oil with a higher viscosity (one with a higher
value) may be better suited if the vehicle is operated at high speeds, or
under extreme load conditions.

How to read oil container label:
The International Lubricant Specification Advisory Committee (ILSAC) Cer-
tification Mark is added to some oil containers to help you select the oil you
should use.

Outside temperature

584

GX460_OM_OM60R43U_(U)

Cooling system

Capacity

(reference)

With rear heater

16.2 qt. (15.3 L, 13.5 Imp.qt.)

Without rear heater 14.4 qt. (13.6 L, 12.0 Imp.qt.)

Coolant type

Use either of the following:

• “Toyota Super Long Life Coolant”

• A similar high-quality ethylene glycol-based

non-silicate, non-amine, non-nitrite, and

non-borate coolant with long-life hybrid

organic acid technology

Do not use plain water alone.

Ignition system (spark plug)

Make

DENSO SK20HR11

Gap

0.043 in. (1.1 mm)

NOTICE

■

Iridium-tipped spark plugs

Use only iridium-tipped spark plugs. Do not adjust the spark plug gap.

GX460_OM_OM60R43U_(U)

585

: Your Lexus vehicle is filled with “Toyota Genuine Differential Gear Oil” at the factory.

Use Lexus approved “Toyota Genuine Differential Gear Oil” or an equivalent of
matching quality to satisfy the above specification. Please contact your Lexus dealer
for further details.

*: Your Lexus vehicle is filled with “Toyota Genuine Differential Gear Oil” at the factory.

Use Lexus approved “Toyota Genuine Differential Gear Oil” or an equivalent of
matching quality to satisfy the above specification. Please contact your Lexus dealer
for further details.

Electrical system (battery)

Specific gravity reading at



F (20



C):

12.3 V or higher

In the case the voltage is less than standard,

charge battery.

(Voltage is checked 20 minutes after the engine)

Charging rates

5 A max.

Front differential

Oil capacity

1.48 qt. (1.40 L, 1.23 Imp.qt.)

Oil type and viscosity

Toyota Genuine Differential Gear Oil LT 75W-85

GL-5 or equivalent

Rear differential

Oil capacity

2.85 qt. (2.70 L, 2.38 Imp.qt.)

Oil type and viscosity*

Toyota Genuine Differential Gear Oil LT 75W-85

GL-5 or equivalent

586

GX460_OM_OM60R43U_(U)

: The fluid capacity is a reference quantity. If replacement is necessary, contact your

Lexus dealer.

: Your Lexus vehicle is filled with “Toyota Genuine Transfer Gear oil LF” at the factory.

Use Lexus approved “Toyota Genuine Transfer Gear oil LF” or an equivalent of
matching quality to satisfy the above specification. Please contact your Lexus dealer
for further details.

Automatic transmission

Fluid

capacity

With air-cooled type

ATF cooler

11.8 qt. (11.2 L, 9.9 Imp.qt.)

Without air-cooled

type ATF cooler

11.6qt. (11.0 L, 9.7 Imp.qt.)

Fluid type

Toyota Genuine ATF WS

NOTICE

■

Transmission fluid type

Using transmission fluid other than the above type may cause abnormal noise or vibra-

tion, or damage the transmission of your vehicle.

Transfer

Oil capacity

1.5 qt. (1.4 L, 1.2 Imp.qt.)

Oil type

Toyota Genuine Transfer Gear oil LF or equivalent

Recommended oil viscosity

SAE 75W

GX460_OM_OM60R43U_(U)

587

: Minimum pedal clearance when depressed with a force of 110 lbf (490 N, 50 kgf)

while the engine is running

: Parking brake pedal travel when pulled up with a force of 44.1 lbf (196 N, 20.0 kgf)

Brakes

Pedal clearance

3.5 in. (90 mm) Min.

Pedal free play

0.04



0.24 in. (1



6 mm)

Brake pad wear limit

0.04 in. (1.0 mm)

Parking brake lining wear limit 0.04 in. (1.0 mm)

Parking brake pedal
travel



7 clicks

Fluid type

SAE J1703 or FMVSS No. 116 DOT 3

SAE J1704 or FMVSS No. 116 DOT 4

Chassis lubrication (Propeller shafts)

Spider

Slide yoke

Lithium base chassis grease, NLGI No.2

588

GX460_OM_OM60R43U_(U)



18-inch tires



19-inch tires

Steering

Free play

Less than 1.2 in. (30 mm)

Power steering fluid type

Automatic transmission fluid DEXRON

II or III

Tires and wheels

Tire size

P265/60R18 109H

Tire inflation pressure

(Recommended cold tire

inflation pressure)

Front tire

32 psi (220 kPa, 2.2 kgf/cm

or bar)

Rear tire

32 psi (220 kPa, 2.2 kgf/cm

or bar)

Spare tire

32 psi (220 kPa, 2.2 kgf/cm

or bar)

Wheel size



7 1/2J

Wheel nut torque

76 ft•lbf (103 N•m, 10.5 kgf•m)

Tire size

265/55R19 109V

Tire inflation pressure

(Recommended cold tire

inflation pressure)

Front tire

32 psi (220 kPa, 2.2 kgf/cm

or bar)

Rear tire

32 psi (220 kPa, 2.2 kgf/cm

or bar)

Spare tire

32 psi (220 kPa, 2.2 kgf/cm

or bar)

Wheel size



7 1/2J

Wheel nut torque

76 ft•lbf (103 N•m, 10.5 kgf•m)

GX460_OM_OM60R43U_(U)

589

A: Wedge base bulb (amber)

B: Wedge base bulb (clear)

Light bulbs

Bulb No.

Type

Exterior

Front turn signal lights



Rear turn signal lights



Back-up lights

921

Rear side marker lights



Running board lights



Interior

Personal/

Interior lights

Front



Rear



Vanity lights



Door courtesy lights



590

GX460_OM_OM60R43U_(U)

Fuel information

■

Gasoline quality

In very few cases, driveability problems may be caused by the brand of gasoline you are

using. If driveability problems persist, try changing the brand of gasoline. If this does not

correct the problem, consult your Lexus dealer.

■

Recommendation of the use of gasoline containing detergent additives

●

Lexus recommends the use of gasoline that contains detergent additives to avoid the

build-up of engine deposits.

●

All gasoline sold in the U.S.A. contains minimum detergent additives to clean and/or

keep clean intake systems, per EPA’s lowest additives concentration program.

●

Lexus strongly recommends the use of Top Tier Detergent Gasoline. For more informa-

tion on Top Tier Detergent Gasoline and a list of marketers, please go to the official

website www.toptiergas.com.

■

Recommendation of the use of low emissions gasoline

Gasolines containing oxygenates such as ethers and ethanol, as well as reformulated

gasolines, are available in some cities. These fuels are typically acceptable for use, pro-

viding they meet other fuel requirements.

Lexus recommends these fuels, since the formulations allow for reduced vehicle emis-

sions.

You must only use unleaded gasoline.
Select premium unleaded gasoline with an octane rating of 91 (Research
Octane Number 96) or higher required for optimum engine performance
and fuel economy. If the octane rating is less than 91, damage to the engine
may occur and may void the vehicle warranty.
At minimum, the gasoline you use should meet the specifications of ASTM
D4814 in the U.S.A..

GX460_OM_OM60R43U_(U)

591

■

Non-recommendation of the use of blended gasoline

●

If you use gasohol in your vehicle, be sure that it has an octane rating no lower than 91.

●

Lexus does not recommend the use of gasoline containing methanol.

■

Non-recommendation of the use of gasoline containing MMT

Some gasoline contains an octane enhancing additive called MMT (Methylcy clopenta-

dienyl Manganese Tricarbonyl).
Lexus does not recommend the use of gasoline that contains MMT. If fuel containing

MMT is used, your emission control system may be adversely affected.
The malfunction indicator lamp on the instrument cluster may come on. If this happens,

contact your Lexus dealer for service.

■

If your engine knocks

●

Consult your Lexus dealer.

●

You may occasionally notice light knocking for a short time while accelerating or driv-

ing uphill. This is normal and there is no need for concern.

●

Use only gasoline containing up to 15% etha-

nol.

DO NOT use any flex-fuel or gasoline that

could contain more than 15% ethanol, includ-

ing from any pump labeled E30, E50, E85

(which are only some examples of fuel con-

taining more than 15% ethanol).

DO NOT use gasoline con-
taining more than 15% ethanol.

(30% ethanol)

(50% ethanol)

(85% ethanol)

592

GX460_OM_OM60R43U_(U)

NOTICE

■

Notice on fuel quality

●

Do not use improper fuels. If improper fuels are used, the engine will be damaged.

●

Do not use leaded gasoline.

Leaded gasoline can cause damage to your vehicle’s three-way catalytic converters

causing the emission control system to malfunction.

●

Do not use gasohol other than the type previously stated.

Other gasohol may cause fuel system damage or vehicle performance problems.

●

Using unleaded gasoline with an octane number or rating lower than the level previ-

ously stated may cause persistent heavy knocking.

At worst, this may lead to engine damage and will void the vehicle warranty.

■

Fuel-related poor driveability

If poor driveability (poor hot starting, vaporization, engine knocking, etc.) is encoun-

tered after using a different type of fuel, discontinue the use of that type of fuel.

■

When refueling with gasohol

Take care not to spill gasohol. It can damage your vehicle’s paint.

593

GX460_OM_OM60R43U_(U)

Tire information

Tire size

(

P. 595)

DOT and Tire Identification Number (TIN)

(



P. 594)

Location of treadwear indicators

(



P. 488)

Tire ply composition and materials

Plies are layers of rubber-coated parallel cords. Cords are the strands which form the

plies in a tire.

Radial tires or bias-ply tires

A radial tire has “RADIAL” on the sidewall. A tire not marked “RADIAL” is a bias-ply

tire.

TUBELESS or TUBE TYPE

A tubeless tire does not have a tube and air is directly put into the tire. A tube type tire

has a tube inside the tire and the tube maintains the air pressure.

Load limit at maximum cold tire inflation pressure

(



P. 599)

Maximum cold tire inflation pressure

(



P. 599)

This means the pressure to which a tire may be inflated.

Uniform tire quality grading

For details, see “Uniform Tire Quality Grading” that follows.

Summer tires or all season tires

(



P. 493)

An all season tire has “M+S” on the sidewall. A tire not marked “M+S” is a summer

tire.

Typical tire symbols

2
3
4

594

GX460_OM_OM60R43U_(U)

DOT symbol

Tire Identification Number (TIN)
Tire manufacturer’s identification mark
Tire size code
Manufacturer’s optional tire type code (3 or 4 letters)
Manufacturing week
Manufacturing year
Manufacturer’s code

: The DOT symbol certifies that the tire conforms to applicable Federal Motor Vehicle

Safety Standards.

Typical DOT and Tire Identification Number (TIN)



Type A



Type B

2
3
4
5
6
7
8

GX460_OM_OM60R43U_(U)

595

■

Typical tire size information

The illustration indicates typical tire
size.

Tire use (P = Passenger car,
T = Temporary use)
Section width (millimeters)
Aspect ratio
(tire height to section width)
Tire construction code
(R = Radial, D = Diagonal)
Wheel diameter (inches)
Load index (2 digits or 3 digits)
Speed symbol (alphabet with one letter)

■

Tire dimensions

Section width
Tire height
Wheel diameter

Tire size

2
3

5
6
7

2
3

GX460_OM_OM60R43U_(U)

597

This information has been prepared in accordance with regulations issued by the
National Highway Traffic Safety Administration of the U.S. Department of Trans-
portation.
It provides the purchasers and/or prospective purchasers of Lexus vehicles with
information on uniform tire quality grading.

Your Lexus dealer will help answer any questions you may have as you read this infor-

mation.

■

DOT quality grades

All passenger vehicle tires must conform to Federal Safety Requirements in
addition to these grades. Quality grades can be found where applicable on
the tire sidewall between tread shoulder and maximum section width.

For example: Treadwear 200 Traction AA Temperature A

■

Treadwear

The treadwear grade is a comparative rating based on the wear rate of the tire
when tested under controlled conditions on a specified government test
course.

For example, a tire graded 150 would wear one and a half (1 - 1/2) times as well on

the government course as a tire graded 100.

The relative performance of tires depends upon the actual conditions of their use.

Performance may differ significantly from the norm due to variations in driving

habits, service practices and differences in road characteristics and climate.

■

Traction AA, A, B, C

The traction grades, from highest to lowest, are AA, A, B and C, and they rep-
resent the tire’s ability to stop on wet pavement as measured under controlled
conditions on specified government test surfaces of asphalt and concrete.

A tire marked C may have poor traction performance.
Warning: The traction grade assigned to this tire is based on braking (straight

ahead) traction tests and does not include cornering (turning) traction.

Uniform Tire Quality Grading

598

GX460_OM_OM60R43U_(U)

■

Temperature A, B, C

The temperature grades are A (the highest), B, and C, representing the tire’s
resistance to the generation of heat and its ability to dissipate heat when
tested under controlled conditions on a specified indoor laboratory test
wheel.

Sustained high temperature can cause the material of the tire to degenerate and

reduce tire life, and excessive temperature can lead to sudden tire failure.
Grade C corresponds to a level of performance which all passenger car tires must

meet under the Federal Motor Vehicle Safety Standard No. 109.
Grades B and A represent higher levels of performance on the laboratory test

wheel than the minimum required by law.
Warning: The temperature grades of a tire assume that it is properly inflated and

not overloaded.

Excessive speed, underinflation, or excessive loading, either separately or in com-

bination, can cause heat buildup and possible tire failure.

GX460_OM_OM60R43U_(U)

599

Glossary of tire terminology

Tire related term

Meaning

Cold tire inflation pressure

Tire pressure when the vehicle has been parked for

three hours or more, or has not been driven more than 1

mile or 1.5 km under that condition

Maximum inflation pres-

sure

The maximum cold inflated pressure to which a tire may

be inflated, shown on the sidewall of the tire

Recommended inflation

pressure

Cold tire inflation pressure recommended by a manu-

facturer

Accessory weight

The combined weight (in excess of those standard items

which may be replaced) of automatic transmission,

power steering, power brakes, power windows, power

seats, radio and heater, to the extent that these items are

available as factory-installed equipment (whether

installed or not)

Curb weight

The weight of a motor vehicle with standard equipment,

including the maximum capacity of fuel, oil and coolant,

and if so equipped, air conditioning and additional

weight optional engine

Maximum loaded vehicle

weight

The sum of:

(a) Curb weight

(b) Accessory weight

(d) Production options weight

Normal occupant weight

150 lb. (68 kg) times the number of occupants specified

in the second column of Table 1

that follows

Occupant distribution

Distribution of occupants in a vehicle as specified in the

third column of Table 1

below

Production options weight

The combined weight of installed regular production

options weighing over 5 lb. (2.3 kg) in excess of the

standard items which they replace, not previously con-

sidered in curb weight or accessory weight, including

heavy duty brakes, ride levelers, roof rack, heavy duty

battery, and special trim

Rim

A metal support for a tire or a tire and tube assembly

upon which the tire beads are seated

600

GX460_OM_OM60R43U_(U)