1995 Lexus LS400 traction control

SECTION 3 – 1
125
STARTING AND DRIVING
Starting and driving
Three−way catalytic converter126 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Engine exhaust caution 127. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Before starting the engine128 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ignition switch with steering lock128 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parking brake129 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
How to start the engine130 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Automatic transmission131 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cruise control136 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electronically modulated air suspension139 . . . . . . . . . . . . . . . . . . . . .
Traction control system141 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Brake system142 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Types of tires145 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

STARTING AND DRIVING
141
TRACTION CONTROL SYSTEM
The traction control system automatically controls
spinning of the rear wheels which may occur when
accelerating on slippery road surfaces, thus assisting
driver control and driving power to the rear wheels.
When you turn the ignition switch on, this system always
turns on. Leave the system on during ordinary driving so
that it can operate when needed. When traction control is
applied, the slip indicator light blinks.
You can turn off the traction control system by pushing
the “TRAC−OFF−” switch. The “TRAC OFF”
indicator / warning light will then come on. Pushing the
“TRAC−OFF−” switch a second time turns the system
back on and extinguishes the “TRAC OFF”
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 operate to prevent the wheels from
spinning. Even though the accelerator pedal is fully depressed,
the engine speed will be restrained to a certain level.

STARTING AND DRIVING
142
Traction control failure warning
If the “TRAC OFF” indicator / warning light flashes, contact
your Lexus dealer as soon as possible. There may be trouble
in the traction control system.
CAUTION
Under certain slippery road conditions, full stability of
the vehicle and power to the rear wheels cannot be
maintained, even though the traction control system is
in operation. In situations where the road surface is
covered with ice or snow, your vehicle should be fitted
with snow tires or tire chains and driven at a more
cautious pace.
BRAKE SYSTEM
The tandem master cylinder brake system is a hydraulic
system with two separate sub−systems. If either sub−system
should fail, the other will still work. However, the pedal will be
harder to press, and your stopping distance will be longer.
Also, the brake system warning light may come on.
CAUTION
Do not drive your vehicle with only a single brake
system. Have your brakes fixed immediately.
Brake booster
The brake booster uses engine vacuum to power−assist the
brakes. If the engine should quit while you are driving, you can
bring the vehicle to a stop with normal pedal pressure. There
is enough reserve vacuum for one or two stops but no more!
CAUTION

Do not pump the brake pedal if the engine stalls. Each
push on the pedal uses up your vacuum reserve.

Even if the power assist is completely lost, the brakes
will still work. But you will have to push the pedal
hard − much harder than normal. And your braking
distance will be longer.

STARTING AND DRIVING
145
TYPES OF TIRES
Make sure what kind of tires your vehicle is originally equipped
with.
1. Summer Tires
Summer tires are high−speed capability tires best suited to
highway driving under dry conditions.
Summer tires are, however, inadequate for driving on
snow−covered or icy roads. For driving on snow−covered or
icy roads, we recommend using snow tires. If installing snow
tires, be sure to replace all four tires.
2. All Season Tires
All Season tires are designed to provide better traction in snow
and to be adequate for driving in most winter conditions, as well
as for use all year round.
All Season tires, however, fall short in acceleration and
handling performance compared with Summer tires in highway
driving. Snow tires have better snow traction than All Season
tires.
CAUTION
Do not mix Summer and All Season tires on your vehicle
as this can cause dangerous handling characteristics,
resulting in loss of control.