2006 Lexus GS430 engine

STARTING AND DRIVING
347
Steering lock
The steering wheel is locked in “OFF” mode.
When the steering lock is activated, you may hear a sound
coming from the steering column, it is not a malfunction. If you
select the “OFF” mode while the driver’s door is open, the
steering wheel is not locked until the driver’s door is closed.
If you select the mode other than “OFF” or start the engine, the
steering lock is disabled.
If there is trouble somewhere in the steering lock system, either
of the following warning messages will appear on the
multi−information display.
 S/T IS NOT UNLOCKED
 CHECK S/T LOCK
G31045
When pushing the engine switch while the brake pedal is
depressed, the steering lock is not unlocked if load is
applied to the steering wheel, and the above message
appears.
The engine will not start. At this time, the master warning light
comes on and the engine switch indicator light blinks green.

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348
G31046
To start the engine in this condition, push the engine
switch again while turning the steering wheel in either
direction as shown in the above illustration.
The steering wheel is unlocked, and the engine will start.
G31047
If the steering lock system is malfunctioning, the above
message appears.
At this time, the master warning light comes on and the engine
switch indicator light blinks amber. The engine will not start.
In this case, contact your Lexus dealer.

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349
How to start the engine
Before starting the engine, be sure to follow the instructions.
CRANKING HOLD FUNCTION
Once you push the engine switch while the brake pedal is
depressed, the cranking hold function continues to crank the
engine in “IG−ON” mode until it starts.
The function stops cranking the engine after about 25 seconds
at maximum if the engine has not started yet. When you crank
the engine again, wait a few seconds and restart it.
BEFORE STARTING THE ENGINE
1. Check the area around the vehicle before entering it.
2. Adjust seat position, seatback angle, seat cushion angle,
seat cushion height, head restraint height and steering wheel
angle.
3. Adjust the inside and outside rear view mirrors.
4. Lock all doors.
5. Fasten seat belts.
Remember to check that the service reminder indicators
function when the engine switch is selected in “IG− ON” mode,
and check the fuel gauge to see that you have sufficient fuel. BEFORE CRANKING
1. Apply the parking brake firmly.
2. Turn off unnecessary lights and accessories.
3. Put the selector lever in ”P”. If you need to restart the engine
while the vehicle is moving, put the selector lever in ”N”. A
starter safety device will prevent the starter from operating if
the selector lever is in any drive position.
4. Depress
the brake pedal and hold it to the floor until driving
off.
The multiport fuel injection system/sequential multiport fuel
injection system in your engine automatically controls the
proper air −fuel mixture for starting. You can start a cold or hot
engine as follows:

STARTING AND DRIVING
350
Starting the engine
Normal starting procedure
G31035
When depressing the brake pedal while carrying an
electronic key, make sure the green engine switch
indicator light comes on. And then push the engine
switch to start the engine.
If you press the engine switch while the brake pedal is
depressed and the transmission is in “P” or “N”, the engine will
start even if initially in “OFF”, “ACC” or “IG −ON” mode.
If you start the engine in “OFF” mode, the engine immobilizer
is disabled, and the security indicator light goes off.
If you push the engine switch while the brake pedal is
depressed with the transmission not in “P” or “N”, “IG −ON”
mode will be selected with the engine not running. If the engine stalls ...
Simply restart it , using the correct procedure given in normal
starting.
If the engine will not start
See ”If your vehicle will not start” on page 462.
NOTICE

Do not race a cold engine.
 If the engine becomes difficult to start or stalls
frequently, have the engine checked immediately.

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351
Stopping the engine
G31036
If you press the engine switch while the selector lever is
in “P” and the engine is running, regardless of brake pedal
position, the engine will be turned off.
With the transmission not in “P”, the engine switch is selected
in “ACC” mode.
If, in an emergency, you must turn the engine off while the
vehicle is moving, press the engine switch for more than 3
seconds. At this time, “ACC” mode is selected.
Several hours after the engine is turned off, you may hear a
sound coming from underneath the luggage compartment for
several minutes. This is normal operation and does not
indicate a malfunction. (See page v.)
CAUTION
To avoid serious personal injury or an accident, observe
the following precautions.
Turn off the engine, only when the vehicle is
completely stopped.
 When you leave the vehicle, the selector lever must
be in “P” and the parking brake must be applied, or
the vehicle may suddenly move.

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353
AUTOMATIC TRANSMISSION
Your automatic transmission has a shift lock system to
minimize the possibility of incorrect operation. This
means you can only shift out of “P” position when the
brake pedal is depressed with the engine switch in
“IGON” mode. ()
G31021
 The shift position or shift range position is displayed
on the instrument cluster.
P: Parking and engine starting
R: Reverse position
N: Neutral position
D: Normal driving position (Shifting into overdrive
possible)
S: “S” mode driving
+: Upshifting
–: Downshifting

STARTING AND DRIVING
354Correct use of the automatic transmission is explained in
the following parts.
(a) Normal driving
(b) Driving in “S” mode
(c) Using engine braking
(d) Backing up
(e) Parking
(f) Good driving practice
(g) If you cannot shift the selector lever
(a) Normal driving
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 1
“P” (Park) position 2“N” (Neutral) position
1. Start the engine as instructed in “Operating the engine
switch” on page 342.
The transmission must be in “P” or “N” position. The engine wi\
ll
not start in any drive position even if engine switch is pushed
while the brake pedal is depressed.

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355
G31023
 1Power position 2Normal position
3Snow position
2. Set the driving pattern selector switch to the normal
position.
Your transmission has a driving pattern selector switch which
allows you to select power, normal or snow mode to suit your
driving condition. For ordinary driving, Lexus recommends
that you use the normal mode to improve fuel economy.
3. For more powerful acceleration and sporty driving, use
the power position.
In the power mode, the “ECT PWR” light in the instrument
cluster is on and the most suitable shift pattern is selected
depending on the driver’s operation of accelerator and brake
pedal and on the vehicle condition. See “Automatic shifting
point change control” on page 356.
For snow mode, see “Electronic Throttle Control System”
on page 364.
G31024
 1 Brake pedal 2“D” (Drive) position
4. With your foot holding down the brake pedal, shift the
selector lever to “D”.
Always use the “D” position to improve fuel economy and quiet
driving. Only in this position, shifting into the overdrive gear is
possible. However, while the engine coolant temperature is
low, the transmission will not shift into the overdrive gear even
in the “D” position. (See “(c) Using engine braking” and “(f)
Good driving practice” for exceptions.)
CAUTION
Never put your foot on the accelerator pedal while
shifting.