1999 LEXUS SC300 check engine

STARTING AND DRIVING
245
If the vehicle speed falls below about 40 km/h (25 mph), the
preset speed will be automatically cancelled.
If the vehicle speed drops 16 km/h (10 mph) below the preset
speed, the preset speed will also automatically be cancelled.
If the preset speed automatically cancels out for other than
these reasons, have your vehicle checked by your Lexus
dealer at the earliest opportunity.
Resetting to a faster speed
Press the control lever upward in the ºRES/ACCº direction
and hold it. Release the lever when the desired speed is
attained. While the lever is held upward, the vehicle will
gradually gain speed.
When
the difference between the actual vehicle speed and the
set speed is less than 5 km/h (3 mph), the set speed can be
increased 1.6 km/h (1 mph) each time by pressing the control
lever upward in the ºRES/ACCº direction quickly within 0.6
seconds.
However, a quicker way to reset is to accelerate the vehicle
and then press the control lever downward in the
ºSET/COASTº direction.
Resetting to a slower speed
Press the control lever downward in the ºSET/COASTº
direction and hold it. Release the lever when the desired
speed is attained. While the lever is held downward, the
vehicle speed will gradually decrease. When
the difference between the actual vehicle speed and the
set speed is less than 5 km/h (3 mph), the set speed can be
lowered 1.6 km/h (1 mph) each time by pressing the control
lever downward in the ºSET/COASTº direction quickly
within 0.6 seconds.
However, a quicker way to reset is to depress the brake pedal
and then press the control lever downward in the
ºSET/COASTº direction.
Even if you downshift the transmission from ºDº to º4º
(SC400) or from ºDº to º3º (SC300) with the cruise control
on, engine braking will not be applied because the cruise
control is not cancelled. To decrease the vehicle speed, reset
to a slower speed with the cruise control lever or depress the
brake pedal. If you use the brake pedal, cruise control is
cancelled.
Resuming the preset speed
If the preset speed is cancelled by pulling the control lever or
by depressing the brake pedal, pushing the lever up in the
ºRES/ACCº direction will restore the speed set prior to
cancellation. However, once the vehicle speed falls below
about 40 km/h (25 mph), the preset speed will not be resumed.
Cruise control failure warning
If the ºCRUISEº indicator light in the instrument cluster
flashes five times and then goes out when using the cruise
control, it means that there is trouble in the cruise control
system. Contact your Lexus dealer.

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247
You can turn off the traction control system by pushing
the ºTRAC OFFº switch. The ºTRAC OFFº indicator/
warning light will then come on. Pushing the ºTRAC
OFFº switch a second time turns the system back on and
extinguishes the ºTRAC OFFº indicator/warning light.
You may hear a slight clicking noise in the engine
compartment when the engine is started. This means that the
traction control system is in the self±check mode, and does
not indicate malfunction.
When the traction control system is operating, you may feel
vibration of your vehicle, caused by operation of the brakes.
This indicates the system is functioning properly.
When getting the vehicle out of mud or new snow, etc. the
traction control system will help operate to prevent the wheels
from spinning.

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250
Anti±lock brake system
The anti±lock brake system is designed to automatically
help prevent lock±up of the wheels during a sudden brake
or braking on slippery road surfaces. This assists in
providing directional stability and steering performance
of the vehicle under these circumstances.
The anti±lock brake system becomes operative after the
vehicle has accelerated to a speed in excess of approximately
10 km/h (6 mph). It stops operating when the vehicle
decelerates to a speed below approximately 5 km/h (3 mph).
You may hear a sound in the engine compartment for a few
seconds when the engine is started or just after the vehicle is
started. This means that the anti±lock brake system is in the
self±check mode, and does not indicate a malfunction.
Effective way to press the ABS brake pedal: When the anti±
lock brake system function is in action, you may feel the brake
pedal pulsating and hear a noise. In this situation, to let the anti±
lock brake system work for you, just hold the brake pedal down
more firmly. Do not pump the brake in a panic stop. Pumping the
brake pedal makes the stopping distance longer.

DRIVING TIPS
259
BREAK±IN PERIOD
Drive gently and avoid high speeds.
You need not follow a break±in schedule with your new
Lexus. But following a few simple tips for the first 1600 km
(1000 miles) can add to the future economy and long life of
your vehicle:

Do not drive over 88 km/h (55 mph).

Avoid overrevving. Maintain engine speed between 2000
and 4000 rpm.

Avoid full±throttle starts.

Try to avoid hard stops during the first 300 km (200 miles).

Do not drive for a long time at any single speed, either fast
or slow.

Do not tow a trailer during the first 800 km (500 miles).
OPERATION IN FOREIGN
COUNTRIES
If you plan to drive your Lexus in another country ...
First, comply with the vehicle registration laws.
Second, confirm the availability of the correct fuel (unleaded
and minimum octane rating).
TIPS FOR DRIVING IN VARIOUS CONDITIONS

Always slow down in gusty crosswinds. This will allow
you much better control.

Drive slowly onto curbs and, if possible, at a right angle.
Avoid driving onto high, sharp±edged objects and other
road hazards. Failure to do so can lead to severe tire
damage resulting in tire bursts.

When parking on a hill, turn the front wheels until they
touch the curb so that the vehicle will not roll. Apply the
parking brake, and place the transmission in ºPº. If
necessary, block the wheels.

Washing your vehicle or driving through deep water may
get the brakes wet. To see whether they are wet, check that
there is no traffic near you and then press the pedal lightly.
If you do not feel a normal braking force, the brakes are
probably wet. To dry them, drive the vehicle cautiously
while lightly pressing the brake pedal with the parking
brake applied. If they still do not work safely, pull to the
side of the road and call a Lexus dealer for assistance.
CAUTION

Before driving, make sure the parking brake is fully
released and that the parking brake reminder light is off.

DRIVING TIPS
260

Do not rest your foot on the brake pedal while
driving. It can cause dangerous overheating,
needless wear, and poor fuel economy.

To drive down a long or steep hill, reduce your speed
and downshift. Remember, if you ride the brakes
excessively, they may overheat and not work
properly. See page 234.

Be careful when accelerating, upshifting,
downshifting or braking on a slippery surface. The
abrupt change in engine speed, such as sudden
acceleration or engine braking, could cause the
vehicle to spin or skid.

Do not drive in excess of the speed limit. Even if the
legal speed limit permits it, do not drive over 140
km/h (85 mph) unless your vehicle has high±speed
capability tires. Driving over 140 km/h (85 mph)
may result in tire failure, loss of control and possible
injury. Be sure to consult a tire dealer to determine
whether the tires on your vehicle are high±speed
capability tires or not before driving at such speeds.

Do not continue normal driving when the brakes are
wet. If they are wet, your vehicle will require a
longer stopping distance, and it may pull to one side
when the brakes are applied. Also, the parking
brake will not hold the vehicle securely.WINTER DRIVING TIPS
Make sure you have a proper freeze protection of engine
coolant.
Your coolant must contain ethylene±glycol type coolant for
a proper corrosion protection of aluminum components. Use
ºToyota Long Life Coolantº or equivalent. See ºChecking
the engine coolant levelº on page 347 for instructions.
NOTICE
Do not use alcohol type antifreeze or plain water alone.
When it is extremely cold, we recommend to use 60%
solution for your Lexus, to provide protection down to about
±50 C (±58F). Do not use more than 70% solution for better
coolant performance.
Check the condition of the battery and cables.
Cold temperatures reduce the capacity of any battery, so it
must be in top shape to provide enough power for winter
starting. Page 380 tells you how to visually inspect the
battery. Your Lexus dealer and most service stations will be
pleased to check the battery charge level.
Make sure the engine oil viscosity is suitable for the cold
weather.
See page 346 for recommended viscosity. Leaving a heavy
summer oil in your vehicle during winter months may cause
harder starting. If you are not sure about which oil to use, call

DRIVING TIPS
261
your Lexus dealer ± they will be pleased to help.
Check
the electronic ignition system for loose connections
or obvious damage.
Keep the door locks from freezing.
Squirt lock de±icer or glycerine into the locks to keep them
from freezing.
Use a washer fluid containing an antifreeze solution.
This product is available at your Lexus dealer and most auto
parts stores. Follow the manufacturer's directions for how
much to mix with water.
NOTICE
Do not use engine antifreeze or any other substitute
because it may damage your vehicle's paint.
Do not use your parking brake when there is a possibility
it could freeze.
When parking, put the transmission into ºPº and block the
front wheels. Do not use the parking brake, or snow or water
accumulated in and around the parking brake mechanism
may freeze the parking brake, making it hard to release.
Keep ice and snow from accumulating under the fenders.
Ice and snow built up under your fenders can make steering
difficult. During bad winter driving, stop and check under the
fenders occasionally. Depending on where you are driving, we recommend you
carry some emergency equipment.
Some of the things you might put in the vehicle are tire chains,
window scraper, bag of sand or salt, flares, small shovel,
jumper cables, etc.
TRAILER TOWING
Your vehicle is designed primarily as a passenger±carrying
vehicle. Towing a trailer will have an adverse effect on
handling, performance, braking, durability and driving
economy (fuel consumption, etc.). Your safety and
satisfaction depend on the proper use of correct equipment
and cautious driving habits. For your safety and the safety of
others, you must not overload your vehicle or trailer. Lexus
warranties do not apply to damage or malfunction caused by
towing a trailer for commercial purposes. Ask your local
Lexus dealer for further details before towing.

DRIVING TIPS
266
Tires

Ensure that your vehicle's tires are properly inflated.
Adjust the tire pressure to the recommended cold tire
pressure indicated below:
SC400, SC 300 ± Front 220 kPa (2.2 kgf/cm
2 or bar, 32 psi)
Rear 220 kPa (2.2 kgf/cm2 or bar, 32
psi)

The trailer tires should be inflated to the pressure
recommended by the trailer manufacturer in respect to the
total trailer weight.
Trailer lights

Trailer lights must comply with federal, state/provincial
and local regulations. See your local recreational vehicle
dealer or rental agency for the correct type of wiring and
relays for your trailer. Check for correct operation of the
turn signals and stop lights each time you hitch up. Direct
splicing may damage your vehicle's electrical system and
cause a malfunction of your lights.
Break±in schedule

Lexus recommends that you do not tow a trailer with a new
vehicle or a vehicle with any new power train component
(engine, transmission, differential, wheel bearing, etc.) for
the first 800 km (500 miles) of driving.
Maintenance

If you tow a trailer, your vehicle will require more frequent
maintenance due to the additional load. For this
information, please refer to the scheduled maintenance
information in the ºOwner's Manual Supplement/
Maintenance Scheduleº.

Retighten all fixing bolts of the towing ball and bracket
after approximately 1000 km (600 miles) of trailer driving.
Pre±towing safety check

Check that your vehicle remains level when a loaded or
unloaded trailer is hitched. Do not drive if the vehicle has
an abnormal nose±up or nose±down condition, and check
for improper tongue load, overload, worn suspension or
other possible causes.

Make sure the trailer cargo is securely loaded so that it
cannot shift.

Check that your rear view mirrors conform to any federal,
state/provincial or local regulation. If they do not, install
required rear view mirrors appropriate for towing
purposes.

DRIVING TIPS
267
Trailer towing tips
When towing a trailer, your vehicle will handle differ ently
than when not towing. The three main causes of
vehicle±trailer accidents are driver error, excessive speed
and improper trailer loading. Keep these in mind when
towing:

Before starting out, check the operation of the lights and
all vehicle±trailer connections. After driving a short
distance, stop and recheck the lights and connections.
Practice turning, stopping and backing with a trailer in an
area away from traffic until you learn the feel.

Backing with a trailer is difficult and requires practice.
Grip the bottom of the steering wheel and move your hand
to the left to move the trailer to the left. Move your hand
to the right to move the trailer to the right. (This procedure
is generally opposite to that when backing without a
trailer.) Also, just turn the steering wheel a little at a time,
avoiding sharp or prolonged turning. Have someone guide
you when backing to reduce the risk of an accident.

Because stopping distance may be increased,
vehicle±to±vehicle distance should be increased when
towing a trailer. For each 16 km/h (10 mph) of speed,
allow at least one vehicle and trailer length between you
and the vehicle ahead. Avoid sudden braking as you may
skid, resulting 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 turns. The trailer could hit
your vehicle in a tight turn. Slow down before making a
turn to avoid the need of sudden braking.

Remember that when making a turn, the trailer wheels will
be closer than the vehicle wheels to the inside of the turn.
Therefore, compensate for this by making a larger than
normal turning radius with your vehicle.

Crosswinds and rough roads will adversely aff ect handling
of your vehicle and trailer, causing sway. Pay attention to
the rear from time to time to prepare yourself for being
passed by large trucks or buses, which may cause your
vehicle and trailer to sway. If swaying happens, firmly
grip the steering wheel and reduce speed immediately but
gradually. Never increase speed. If it is necessary to
reduce speed, brake slowly. Steer straight ahead. If you
make no extreme correction with the steering or brakes,
your vehicle and trailer will stabilize.

Be careful when passing other vehicles. Passing 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 braking and electrical
charging performance, do not use overdrive.
Transmission must be in the º4º position (SC400) or in the
º3º position (SC300).