2006 LEXUS LS430 check engine

106
2-2. Instrument cluster
CAUTION
■If a safety system warning light does not come on
Should a safety system light such as ABS, TR
AC OFF or the airbag warning light
not come on when you start the engine, th is could mean that these systems are not
available to help protect you in an accident, which could result in death or serious
injury. Have the vehicle inspected by your Lexus dealer immediately if this occurs.
■ Warning lights
Warning lights inform the driver of a malfunction in the indicated vehi -
cle’s systems. (
P. 328 )
* These lights turn on when the ignition sw itch is turned to ON to indicate that
a system check is being performed. Th ey will turn off after the engine is
started on, or after a few seconds.
There may be a malfunction in a system if a
light does not come on, or if the
lights do not turn off. Have the vehicle inspected by your Lexus dealer.
*
(U.S.A)
(U.S.A) (Canada) (U.S.A) (Canada)
(Canada)

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2-3. Operating the headlight and windshield wipers
Adaptive front lighting system (AFS)
To improve road illumination when turning, the right side headlight moves right
on right turns, and the left side headlight moves left on left turns.
Adaptive front lighting system
cancel switch
On
Off
When the system is canceled,
the “

AFS OFF” indicator lights
up in the instrument cluster.
1
2
3
■Operating conditions
The system starts to operate when the v
ehicle’s speed increases above 6 mph (10
km/h), and stops when the vehicles speed drops below 6 mph (10 km/h).
■When the “AFS OFF” indicator light flashes,
This indicates a system failure. Have your vehicle checked at your Lexus dealer.
NOTICE
■To prevent battery discharge
Do not leave the lights on longer than necessary when the engine is not running.

149
2-5. Driving information
2
When driving
Winter driving tips
Carry out the necessary preparations and inspections before driving the
vehicle in winter. Always drive the vehicle in a manner appropriate for the
prevailing weather and roadway conditions.
■ Pre-winter preparations
●Use fluids appropriate to the p revailing outside temperatures.
• Engine oil
• Engine coolant
• Washer fluid
●Inspect the level and specific gravity of battery electrolyte.
●Have the vehicle fitted with four sno w tires or purchase a set of tire
chains for the rear tires.
Ensure that all tires are the same si
ze and brand, and that chains
match the size of the tires.
■ Befor
e driving the vehicle
Perform the following steps acco r
ding to the driving conditions.
●Do not forcibly try to open a window or move a wiper that has fro-
zen. Pour some warm water over the frozen area to melt the ice. 
Wipe away the water immediately to pr
event it from freezing.
●To ensure proper operation of the climate control system fan,
remove any snow that has accumulated on the air inlet vents in front
of the windshield.
●Remove any ice that has accumulated on the vehicle chassis.
●Periodically check for and remove any excess ice or snow that may
accumulate in the wheel well or brakes.

154
2-5. Driving information
■Before towing
●Ensure that your vehicle’s tires are properly inflated. (P.283 )
●Trailer tires should be inflated according to the trailer manufacturer’s recom -
mendation.
●All trailer lights must work to be legal.
●Confirm all lights work each time you connect them.
●Check that your vehicle remains level when a loaded or unloaded trailer is
hitched. Do not drive if the vehicle is not level, and check for improper tongue
load, overloading, worn suspension, or other possible causes.
●Make sure the trailer cargo is securely loaded.
●Check that your rear view mirrors conform to any federal, state/provincial or
local regulations. If they do not, instal l rear view mirrors appropriate for towing
purposes.
■Break-in schedule
Lexus recommends that you do not use a new vehicle or a vehicle with any new
p

ower train components (engine, transmissi on, differential, wheel bearing, etc.) to
tow a trailer for the first 500 miles (800 km) of driving.
■Maintenance
●If you tow a trailer, your vehicle will require more frequent maintenance due to
the additional load. (see “Owner’s Manual Supplement/ Scheduled Mainte -
nance”)
●Retighten the fixing bolts of the towing ball and bracket after approximately
600 miles (1000 km) of trailer towing.

157
2-5. Driving information
2
When driving
• As stopping distance is increased when towing a trailer, vehicle-to-
vehicle distance should be increas ed. For each 10 mph (16 km/h) of
speed, allow at least one vehicle and trailer length.
• Avoid sudden braking as you may sk id, r
esulting in jackknifing and loss
of control. This is especially true on wet or slippery surfaces.
• Avoid jerky starts or sudden acceleration.
• Avoid jerky steering and sharp turn s, and slo
w down before making a
turn.
• Note that when making a turn, the tr ailer wheels will be closer than the
v
ehicle wheels to the inside of th e turn. Compensate by making a
larger than normal turning radius.
• Crosswinds and rough roads will ad v
ersely affect handling of your
vehicle and trailer, causing sway. Peri odically check the rear to prepare
for being passed by large trucks or buses, which may cause your vehi-
cle and trailer to sway. If s
waying occurs, firmly grip the steering wheel,
reduce speed immediately but gradually, and steer straight ahead.
Never increase speed. If you make no extreme correction with the
steering or brakes, your vehi cle and trailer will stabilize.
• Take care when passing other vehicl es. P
assing requires considerable
distance. After passing a vehicle, do not forget the length of your
trailer, and be sure you have plenty of room before changing lanes.
• In order to maintain efficient engine br
aking and electrical charging
performance, do not use overdrive. Transmission shift range position
must be in “4”, in the “S” mode.
• Due to the added load of the traile r
, your vehicle’s engine may overheat
on hot days (at temperatures over 85°F [30°C]) when driving up a
long or steep grade. If the engine coolant temperature gauge indicates
overheating, immediately turn off the air conditioning (if in use), pull
your vehicle off the road and stop in a safe spot. See “If your vehicle
overheats” ( P.359 ).

252
4-2. Maintenance
General maintenance
Engine compartment
Listed below are the general maintenance items that should be performed at
the interval specified in the Owner’s Manual Supplement. It is recommended
that any problem you notice should be brought to the attention of your Lexus
dealer or qualified service shop for advice.
ItemsCheck points
Battery• Maintenance-free. ( P. 2 7 3 )
Brake fluid • At the correct level? ( P. 2 7 0 )
Engine coolant• At the correct level? ( P. 2 6 8 )
Engine oil• At the correct level? ( P. 2 6 3 )
Exhaust system• No fumes or strange sound?
Power steering fluid• At the correct level? ( P. 2 7 2 )
Radiator/condenser/ hoses• Not blocked with foreign matter? ( P. 2 6 9 )
Wa s h e r f l u i d•Sufficient? ( P. 2 7 7 )

254
4-2. Maintenance
Vehicle exterior
ItemsCheck points
Door/trunk• Do they operate smoothly?
• Do the locks work properly?
Engine hood• Does the hood latch and lock work properly?
Fluid leaks• Are there any leaks when the vehicle is parked?
Ti r e
• Is the inflation pressure correct? ( P. 2 8 3 )
• Are tire surfaces worn or damaged? ( P. 2 7 8 )
• Do the tires need to be rotated according to the mainte- nance schedule? ( P. 2 7 8 )
• Are the wheel nuts loose?

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4-3. Do-it-yourself maintenance
CAUTION
The engine compartment contains many mechanisms and fluids that many move
suddenly, become hot, or become electrically energized. To avoid death or serious
injury:
■When working in the engine compartment:
●Keep hands, clothing, and tools away from the moving fan and engine drive belt.
●Be careful not to touch the engine, radiator, exhaust manifold and power steering
fluid reservoir, etc. right after driving as they may be hot. Oil and other fluids may
also be hot.
●Do not leave anything that may burn easily , such as paper or rags, in the engine
compartment.
●Do not smoke, cause sparks or expose an open flame to fuel or the battery. 
Fuel and battery fumes are flammable.
●Be extremely cautious when working on the battery. 
It contains poisonous and corrosive sulfuric acid.
■When the engine is running
Perform maintenance checks with adequate ventilation
■When working near the electric cooling fan or radiator grill:
Be sure the ignition is off. With the igni tion on, th
e electric cooling fan may automat-
ically start to run if the air conditioning is on and/
or if the coolant temperature is
high. ( P.262 )
■When working on or under the vehicle:
●Do not get under the vehicle with just the jack supporting it. 
Always use automotive jack stands or other solid supports.
●Use eye protection to prevent flying or falling material, fluid spray, etc. from get -
ting in your eyes.