2005 LEXUS LS430 engine

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81

Idling for a long period with the air conditioning on in
stop−and−go traffic.
 Towing a trailer.
NOTICE
Do not remove the thermostat in the engine cooling
system as this may cause the engine to overheat. The
thermostat is designed to control the flow of coolant
to keep the temperature of the engine within the
specified operating range.
 Do not continue driving with an overheated engine.
See “If your vehicle overheats” on page 404.
TACHOMETER
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The tachometer indicates engine speed in thousands of
rpm (revolutions per minute). Use it while driving to
prevent engine overrevving.
Driving with the engine running too fast causes excessive
engine wear and poor fuel economy. Remember, in most
cases the slower the engine speed, the greater the fuel
economy.
NOTICE
Do not let the indicator needle get into the red zone. This
may cause severe engine damage.

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(a) Brake System Warning Light
This light comes on in the following cases when the ignition
switch is in the “ON” position.
When the parking brake is applied ...
This light comes on for a few seconds when the ignition switch
is turned to the “ON” position even after the parking brake is
released.
 When the brake fluid level is low ...
CAUTION
It is dangerous to continue driving normally when the
brake fluid level is low.
Have your vehicle checked at your Lexus dealer in the
following case:
The light does not come on even if the parking brake is
applied when the ignition switch is in the “ON” position.
 The light does not come on even if the ignition switch is
turned on with the parking brake released.
A warning light turning on briefly during operation does not
indicate a problem.
CAUTION
If either of the following conditions occurs, immediately
stop your vehicle at a safe place and contact your Lexus
dealer.
 The light does not turn off even after the parking
brake is released while the engine is running.
In this case, the brakes may not work properly and
your stopping distance will become longer. Depress
the brake pedal firmly and bring the vehicle to an
immediate stop.
 The brake system warning light remains on together
with the “ABS” warning light.
In this case, not only the antilock brake system will
fail but also the vehicle will become extremely
unstable during braking.

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(e) Discharge Warning Light
This light warns that the battery is being discharged.
If it comes on while you are driving, stop the vehicle, turn off the
engine, and check for the cause. Look first at the engine drive
belt.
 If it is loose or broken, the generator will not charge the
battery properly.
 If the belt is O.K., there is a problem somewhere in the
charging system.
The engine ignition will continue to operate, however, until the
battery is discharged. Turn off the air conditioning, blower,
radio, etc., and drive directly to the nearest Lexus dealer or
repair shop.
NOTICE
Do not continue driving if the engine drive belt is broken
or loose.
(f) Malfunction Indicator Lamp
This lamp comes on when the ignition switch is turned to
the “ON” position and goes off after the engine starts.
This means that the warning light system is operating
properly.
If the lamp remains on, or the lamp comes on while
driving, first check the following:
 Empty fuel tank
If the fuel tank is empty, refuel immediately.
 Loose fuel tank cap
If the fuel tank cap is loose, securely tighten it.
These cases are temporary malfunctions. The malfunction
indicator lamp will go off after taking several driving trips.
If the lamp does not go off even after several trips, contact your
Lexus dealer as soon as possible.
If the fuel tank is not empty or the fuel tank cap is not
loose...
 There is a problem somewhere in the engine, emission
control system, electronic throttle control system, automatic
transmission electrical system or warning light system itself.
Contact your Lexus dealer as soon as possible to service the
vehicle.
If this lamp comes on and engine speed does not increase
when the accelerator pedal is depressed, there may be a
problem somewhere in the electronic throttle control system.

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87
At this time, vibration may occur. However, if you depress the
accelerator pedal more firmly and slowly, you can drive your
vehicle at low speeds. Have your Lexus checked by your
Lexus dealer as soon as possible.
Even if the abnormality of the electronic throttle control system
is corrected during low speed driving, the system may not be
recovered
until the engine is stopped and the ignition switch is
turned to “ACC” or “LOCK” position.
Emissions inspection and maintenance (I/M) programs
Your vehicle may not pass a state emission inspection if the
malfunction indicator lamp remains on. Contact your Lexus
dealer to check your vehicle’s emission control system and
OBD (On −Board Diagnostics) system before taking your
vehicle for the inspection.
For details, see “Emissions inspection and maintenance (I/M)
programs” on page 431.
(g) Master Warning Light
If any system malfunctions, this warning light comes on or
flashes together with a warning tone, and a warning message
appears in the multi−information display. When the cause of
the problem is eliminated, the warning tone and message on
the display will turn off.
(h) “ABS” Warning Light
The light comes on when the ignition switch is turned to the
“ON” position. If the anti−lock brake system and the brake
assist system work properly, the light turns off after a few
seconds. Thereafter, if either of the systems malfunctions, the
light comes on again.
When the “ABS” warning light is on (and the brake system
warning light is off), the anti −lock brake system, the brake
assist system, the traction control system and/or the vehicle
stability control system do/does not operate, but the brake
system still operates conventionally.
When the “ABS” warning light is on (and the brake system
warning light is off), the anti− lock brake system does not
operate so that the wheels could lock up during a sudden
braking or braking on slippery road surfaces.

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The displayed cruise information values indicate the general
driving
condition and may not always reflect precise and actual
conditions.
 Available driving distance
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When the fuel gauge is close to “F”
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When the fuel gauge is close to middle
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When the fuel gauge is close to “E”
The available driving distance is calculated and displayed
depending on the amount of remaining fuel.
 Average fuel consumption
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The average fuel consumption is calculated and displayed
based on the total driving distance and the total fuel
consumption with the engine running.
The value is updated every 10 seconds.
To begin recalculating, push the “RESET” button for about 1 to
2 seconds.
 Current fuel consumption
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The current fuel consumption is calculated and displayed
based on the driving distance and the fuel consumption
per 2 second interval with the engine running.
The value is updated every 2 seconds.
If you are driving at low speeds just before stopping, the
accurate figure may not be shown.
Average fuel consumption after refueling
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The average fuel consumption after refueling is
calculated and displayed based on the total driving
distance and the total fuel consumption after refueling.
The value is updated every 10 seconds.
When refueling, be sure to stop your vehicle and turn the
ignition switch off.
The average fuel consumption could not be calculated in either
of the following cases:
 Refueled by opening the fuel filler door using the manual
lever in the trunk
 Refueled with a small quantity of gasoline
To begin recalculating, push the “RESET” button for about 1 to
2 seconds.

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92The multi−
information display shows “Tank Avg –.– MPG” for
a while after refueling or pushing the “RESET” switch, and then
shows the previous average fuel consumption until you start
the vehicle.
 Driving distance after refueling
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The driving distance after refueling is displayed.
When refueling, be sure to stop your vehicle and turn the
ignition switch off.
The driving distance after refueling could not be calculated in
either of the following cases:
 Refueled by opening the fuel filler door using the manual
lever in the trunk
 Refueled with a small quantity of gasoline
To begin recalculating, push the “RESET” button for about 1 to
2 seconds.
 Elapsed time
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The total time that the engine has been running is
displayed.
When the engine is started again after the ignition is off, the
driving time is added to the previous value. Up to 99 hours 59
minutes can be displayed. When the driving time exceeds 99
hours 59 minutes, the display returns to 0 and recounting
starts.
To begin recalculating, push the “RESET” button for about 1 to
2 seconds.
 Average vehicle speed
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The average vehicle speed is calculated and displayed
based on the total driving distance and the total driving
time with the engine running.
The displayed value is updated every 10 seconds.
To begin recalculating, push the “RESET” button for about 1 to
2 seconds.

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(c) Warning messages
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When the engine oil pressure becomes too low, the
master warning light comes on, a warning tone sounds
and the above message appears.
If this message appears while you are driving, pull off the road
to a safe place and stop the engine immediately. Call a Lexus
dealer or qualified repair shop for assistance.
The message may appear when the oil level is extremely low.
It is not designed to indicate low oil level, and the oil level must
be checked using the oil level dipstick.
NOTICE
Do not drive the vehicle while this warning message is
displayed even for one block. It may ruin the engine.
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When your brake pads have worn down enough to require
replacement, the master warning light flashes and a
warning tone sounds and the above message appears.
If this message appears while you are driving, have the brake
pads checked and replaced by your Lexus dealer as soon as
possible.
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When the engine oil level is too low, the master warning
light flashes, a warning tone sounds, and the above
message appears.
Add oil as soon as possible. (For instructions, see “Checking
the engine oil level” on page 452.)
While driving on steep inclines or rough roads which causes
the vehicle to substantially sway or on curves, this message
may appear due to the movement of engine oil in the engine.

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In normal conditions, due to engine oil consumption, this
message may a
ppear earlier than the specified service interval
of the scheduled maintenance. This is because the engine oil
is consumed to the low level within the scheduled maintenance
interval and does not indicate a problem. (For detailed
information, see “Facts about engine oil consumption” on page
450.)
NOTICE
Continued engine operation with low engine oil will
damage the engine.
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This message indicates that the engine oil maintenance
data has been reset. After replacing the engine oil, be sure
to reset the maintenance data.
To reset the data, perform the following operations:
1. Push the “ODO/TRIP” button to change the display to
blank.
2. Turn the ignition switch off.
3. Turn the ignition switch to “ON” with the trip meter
“RESET” button held down.
4. Keep pushing the “RESET” button for longer than 5
seconds after the ignition is turned on.
After the above operation, the master warning light comes
on, a warning tone sounds and the above message
appears to inform you that the engine oil maintenance
data has been reset. (U.S.A. only)