tire pressure lexus LFA 2012 Technical Information / LEXUS 2012 LFA (OM77006U) Owner's Manual

276
4-3. Do-it-yourself maintenance
NOTICE
■Repairing or replacing tires, wheels, tire pressure warning valves, transmitters
and tire valve caps
●When removing or fitting the wheels, tires or the tire pressure warning valves and
transmitters, contact your Lexus dealer as the tire pressure warning valves and
transmitters may be damage d if not handled correctly.
●When replacing tire valve caps, do not us e tire valve caps other than those speci-
fied. The cap may become stuck.
■To avoid damage to the tire pressure warning valves and transmitters
When a tire is repaired with liquid seal ants, the tire pressure warning valve and
transmitter may not operate properly. If a liquid sealant is used, contact your Lexus
dealer or other qualified service shop as so on as possible. Make sure to replace the
tire pressure warning valve and transmitter when replacing the tire. ( P. 2 7 0 )
■Impacts from road surfaces
This vehicle is equipped with low prof ile tires, which may cause greater damage
than usual to tires, wheels, body and susp ension due to impacts from road surfaces.
Therefore, pay attention to the following:
●Be sure to use proper tire inflation pressure.
If tires are under-inflated, tires and wheels may be damaged more severely.
●Avoid potholes, uneven pavement, curbs and other road hazards.
Failure to do so may lead to severe ti re, wheel, body and suspension damage.
Even if there is no obvious damage, if the vehicle receives an impact from the road
surface, have it inspected at your Lexus dealer.
■If tire inflation pressure of each tire becomes low while driving
Do not continue driving, or your tires and/or wheels may be ruined.
■Tire precautions during cold weather
This vehicle is fitted with high-grip tires to enhance grip. These tires may be dam-
aged if their temperature falls below -31 F (-35C). In extremely cold conditions,
use snow tires on the vehicle and keep the high-grip tires in a warm place.
Even if there is no obvious damage, if the temperature of the high-grip tires falls
below -31 F (-35C), have them inspected at your Lexus dealer.

277
4-3. Do-it-yourself maintenance
4
Maintenance and care
Tire inflation pressure
■Tire inflation pressure
The recommended cold tire inflation pressure and tire size is displayed
on the tire and loading information label. ( P. 366)

278
4-3. Do-it-yourself maintenance
■Inspection and adjustment procedure
Ti r e v a l v e
Tire pressure gauge
Remove the tire valve cap.
Press the tip of the tire pressure gauge onto the tire valve.
Read the pressure using the gauge gradations.
If the tire inflation pressure is not at the recommended level,
adjust the pressure.
If you add too much air, press the center of the valve to deflate.
After completing the tire inflation pressure measurement and
adjustment, apply soapy water to the valve and check for leakage.
Put the tire valve cap back on.
STEP1
STEP2
STEP3
STEP4
STEP5
STEP6

279
4-3. Do-it-yourself maintenance
4
Maintenance and care
■Tire inflation pressure check interval
You should check tire inflation pressure every two weeks, or at least once a month.
■Effects of incorrect tire inflation pressure
Driving with incorrect tire inflation pressure may result in the following:
●Reduced fuel efficiency
●Reduced driving comfort and tire life
●Reduced safety
●Damage to the drive train
If a tire needs frequent inflating, have it checked by your Lexus dealer.
■Instructions for checking tire inflation pressure
When checking tire inflation pressure, observe the following:
●Check only when the tires are cold.
If your vehicle has been parked for at least 3 hours or has not been driven for
more than 1 mile or 1.5 km, you will get an accurate cold tire inflation pressure
reading.
●Always use a tire pressure gauge.
The appearance of the tire can be mislea ding. In addition, tire inflation pressure
that is even just a few pounds off can affect ride quality and handling.
●Do not reduce tire inflation pressure after driving. It is normal for tire inflation
pressure to be higher after driving.
●Never exceed the vehicle capacity weight.
Passengers and luggage weight should be placed so that the vehicle is bal-
anced.
■Tire inflation pressure display
Tire inflation pressure can be checked on the meter's “Tire Pressure” display.
(  P. 1 3 2 )

280
4-3. Do-it-yourself maintenance
CAUTION
■Proper inflation is critical to save tire performance
Keep your tires properly inflated. Otherwise, the following conditions may occur
and result in an accident causing death or serious injury:
●Excessive wear
●Uneven wear
●Poor handling
●Possibility of blowouts resulting from overheated tires
●Poor sealing of the tire bead
●Wheel deformation and/or tire separation
●A greater possibility of tire damage from road hazards
NOTICE
■When inspecting and adjusting tire inflation pressure
Be sure to put the tire valve caps back on.
Without the valve caps, dirt or moisture could get into the valve and cause air leak-
age, which could result in an accident. If the caps are lost, replace them as soon as
possible.

281
4-3. Do-it-yourself maintenance
4
Maintenance and care
Wheels
If a wheel is bent, cracked or heavily corroded, it should be replaced.
Otherwise, the tire may separate from the wheel or cause loss of handling
control.
The wheel bolts used are exclusive to the LFA. When replacing the wheels or
wheel bolts, consult your Lexus dealer.
■ Aluminum wheel precautions
●Use only Lexus wheel bolts design ed for use with your aluminum
wheels.
● When repairing or changing your tires, check that the wheel bolts
are still tight after driving 1000 miles (1600 km).
● Use only Lexus genuine balance we ights or equivalent when bal-
ancing your wheels.
■When replacing wheels
The wheels of your Lexus are equipped with tire pressure warning valves and trans-
mitters that allow the tire pressure warning system to provide advanced warning in
the event of a loss in tire inflation pres sure. Whenever wheels are replaced, the tire
pressure warning valves and tran smitters must be installed. (P. 2 7 1 )
■Wheel bolt torque
An exclusive hub socket for the wheel bolts of
the LFA is contained in the tool bag. A 1 /2-
inch (12.7 mm) drive extension bar and a
torque wrench are required to tighten the
bolts.
Tightening torque:
81 ft
•lbf (110 N•m, 11.2 kgf•m)

282
4-3. Do-it-yourself maintenance
CAUTION
■When replacing wheels
●Do not use wheels that are a different size from those recommended in the
Owner’s Manual, as this may result in loss of handling control.
●Never use an inner tube in a leaking wheel which is designed for a tubeless tire.
Doing so may result in an accident, causing death or serious injury.
■Wheel bolts
Observe the following precautions to reduce the risk of death or serious injury:
●Do not over tighten.
●Never use oil or grease on the wheel bolts.
Oil and grease may cause the wheel bolts to be excessively tightened, leading to
bolt or disc wheel damage. In addition, the oil or grease can cause the wheel bolts
to loosen and the wheel may fall off, causing a serious accident. Remove any oil or
grease from the wheel bolts.
●If there are any cracks or deformations in the wheel bolts, or if the surface treat-
ment becomes worn, have the wheel bolts replaced at your Lexus dealer.
Failure to follow these precautions could cause the wheel bolts to loosen and the
tire to fall off, resulting in death or serious injury.
●If the wheels are frequently removed and installed due to circuit driving etc.,
Lexus recommends periodic changing of the wheel bolts.
NOTICE
■Replacing tire pressure warning valves and transmitters
●Because tire repair or replacement may affect the tire pressure warning valves
and transmitters, make sure to have tires serviced by your Lexus dealer or other
qualified service shop. In addition, make sure to purchase your tire pressure
warning valves and transmitters at your Lexus dealer.
●Ensure that only genuine Lexus wheels are used on your vehicle.
Tire pressure warning valves and transmitters may not work properly with non-
genuine wheels.

316
5-2. Steps to take in an emergency
*1: Open door warning buzzer
P. 3 2 7
*2: Driver’s and passenger’s seat belt reminders buzzer
The driver’s and passenger’s seat belt reminders sound to alert the driver and
passenger that their seat belt is not fa stened. The buzzer sounds intermittently
for 10 seconds after the vehicle has reached a speed of 12 mph (20 km/h).
Then, if the seat belt is still unfastened , the buzzer will sound in a different tone
for 20 more seconds. Tire pressure warning light
When the light comes on:
Low tire inflation pressure
Adjust the tire inflation pres-
sure to the specified level. The
light will turn off after a few
minutes. In case the light does
not turn off even if the tire infla-
tion pressure is adjusted, have
the vehicle checked by your
Lexus dealer.
When the light comes on after
blinking for 1 minute:
Malfunction in the tire pres-
sure warning system Have the system checked by
your Lexus dealer.
Master warning light A buzzer sounds and the
warning light comes on and
flashes to indicate that the
master warning system has
detected a malfunction. 
P. 3 2 2
Warning lightWarning light/DetailsCorrection procedure

5
When trouble arises
317
5-2. Steps to take in an emergency
■If the malfunction indicator lamp comes on while driving
First check the following:
●Is the fuel tank empty?
If it is, fill the fuel tank immediately.
●Is the fuel tank cap loose?
If it is, tighten it securely.
The light will go off after taking several driving trips.
If the light does not go off even after several trips, contact your Lexus dealer as soon
as possible.
■Electric power steering system warning light
When the battery is low or when the voltage drops temporarily, the electric power
steering system warnin g light may come on.
■Passenger detection sensor and passenger seat belt reminder
●If luggage is placed on the passenger seat, the passenger detection sensor may
cause the warning light to flash even if a passenger is not sitting in the seat.
●If a cushion is placed on the seat, the sensor may not detect a passenger, and the
warning light may not operate properly.
■When the tire pressure warning light comes on
Check the tire inflation pressure and adjust to the appropriate level. Pushing the tire
pressure warning reset switch will not turn off the tire pressure warning light. After
the tire inflation pressure is adjusted, it may take a few minutes for the tire pressure
warning light to go off.
■The tire pressure warning light may come on due to natural causes
The tire pressure warning light may come on due to natural causes such as natural
air leaks or tire inflation pressure changes caused by temperature. In this case,
adjusting the tire inflation pressure will turn off the warning light (after a few min-
utes).

318
5-2. Steps to take in an emergency
■If the tire pressure warning system is not functioning
The tire pressure warning system will be disabled in the following conditions:
(When the condition becomes normal, the system will work properly.)
●If tires not equipped with tire pressure warning valves and transmitters are used
●If the ID code on the tire pressure warning valves and transmitters is not regis-
tered in the tire pressure warning computer
●If the tire inflation pressure is 73 psi (500 kPa, 5.1 kgf/cm2 or bar) or higher
The tire pressure warning system may be disabled in the following conditions:
(When the condition becomes normal, the system will work properly.)
●If electronic devices or facilities using similar radio wave frequencies are nearby
●If a radio set at similar frequencies is in use in the vehicle
●If there is a lot of snow or ice on the vehicle, particularly around the wheels or
wheel housings
●If non-genuine Lexus wheels are used (Even if you use Lexus wheels, the tire
pressure warning system may not work properly with some types of tires.)
●If a tire is repaired with the emergency tire puncture repair kit
■If the tire pressure warning light comes on after flashing frequently for 1 minute
If the tire pressure warning light comes on after flashing frequently for 1 minute
when the ignition switch is turned to th e “ON” position, have it checked by your
Lexus dealer.
■Customization that can be configured at Lexus dealer
The vehicle speed linked seat belt reminder buzzer can be disabled.
(Customizable features P. 383)