2006 Lexus GX470 ignition

SECTION 3 – 1
341
STARTING AND DRIVING
Starting and driving
Three−way catalytic converters342
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Engine exhaust caution 343
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Before starting the engine 344
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Ignition switch 345
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Parking brake 347
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How to start the engine 348
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Automatic transmission 349
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Four−wheel drive system 356
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Rear view monitor system 358
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Cruise control 362
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Rear height control air suspension 366
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Electronic modulated suspension 371
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Active traction control system 372
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Vehicle stability control system 375
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Downhill assist control system 377
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Hill −start assist control 380
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Brake system 383
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Tire pressure warning system 387
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Brake pad wear limit indicators 394
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Limited −slip differential 395
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STARTING AND DRIVING
342
THREEWAY CATALYTICCONVERTERS
Threeway catalytic converters are emission control
devices installed in the exhaust system.
The purpose is to reduce pollutants in the exhaust gas.
CAUTION
Keep people and combustible materials away from
the exhaust pipe while the engine is running. The
exhaust gas is very hot.
 Do not idle or park your vehicle over anything that
might burn easily such as grass, leaves, paper or
rags.
NOTICE
A large amount of unburned gases flowing into the
threeway catalytic converter may cause it to overheat
and create a fire hazard. To prevent this and other
damage, observe the following precautions:
 Use only unleaded gasoline.
 Do not drive with an extremely low fuel level; running
out of fuel could cause the engine to misfire, creating
an excessive load on the threeway catalytic
converter.
 Do not allow the engine to run at idle speed for more
than 20 minutes.
 Avoid racing the engine.
 Do not pushstart or pullstart your vehicle.
 Do not turn off the ignition while the vehicle is
moving.
 Keep your engine in good running order.
Malfunctions in the engine electrical system, electric
ignition system or fuel system could cause an
extremely high threeway catalytic converter
temperature.

STARTING AND DRIVING
345
IGNITION SWITCH
“START” — Starter motor on. The key will return to the
“ON” position when released.
For starting tips, see page 348.
“ON” — Engine on and all accessories on.
This is the normal driving position.
NOTICE
Do not leave the key in the “ON” position if the engine
is not running. The battery will discharge and the
electronic ignition system could be damaged.
“ACC” — Accessories such as the radio operate, but the
engine is off.
If you leave the key in the “ACC” or “LOCK” position and open
the driver’s door, a buzzer will remind you to remove the key.

STARTING AND DRIVING
346
“LOCK” — Engine is off and the steering wheel is locked.
The ignition key can be removed only at this position.
To turn the key from “ACC” to the “LOCK” position, you must
put the transmission selector lever in the “P” position.
Once you remove the key, the engine immobilizer system is
automatically set. See “Engine immobilizer system” on page
12.
When starting the engine, the key may seem stuck at the
“LOCK” position. To free it, first be sure the key is pushed all
the way in, and then rock the steering wheel slightly while
turning the key gently.
Approximately five hours after the engine is turned off, you may
hear sound coming from underneath the luggage compartment
for several minutes. This is normal operation and does not
indicate a malfunction. (See “Leak detection pump” on page
vii.)
If, in an emergency, you must turn the engine off while the
vehicle is moving, turn the key only to “ACC”. If is not a malfunction if the needles on all meters and gauges
move slightly when the key is turned tp the “ACC”, “ON” or
“START” position.

STARTING AND DRIVING
348
HOW TO START THE ENGINE
Cranking hold function
Once you turn the ignition key to “START” position and release
it, the cranking hold function continues to crank the engine in
“ON” position until it starts.
The function stops cranking the engine after about 25 seconds
maximum if the engine has not started yet. When you crank
the engine again, wait a few seconds and restart it.
If you hold the key in “START” position, the function will keep
cranking for about 30 seconds maximum.
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.
Starting the engine
Before starting the engine, be sure to follow the instructions in
“Before cranking”.
Normal starting procedure
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:
With your foot off the accelerator pedal, turn the ignition key to
“START” position, then release it.
Engine should be warmed up by driving, not in idle. For
warming up, drive with smoothly turning engine until engine
coolant temperature is within normal range.
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 426.
NOTICE
 Do not race a cold engine.
 If the engine becomes difficult to start or stalls
frequently, have the engine checked immediately.

STARTING AND DRIVING
349
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 ignition switch in “ON”
position. ()
31PY039
The shift position is displayed beside the selector lever
and on the instrument cluster.
P: Parking, engine starting and key removal position
R: Reverse position
N: Neutral position
D: Normal driving position (Shifting into overdrive possible)
4: Position for engine braking (Shifting into overdrive not
possible)
When the cruise control is being used, even if you
downshift from “D” to “4”, engine braking will not be
enabled because the cruise control is not cancelled. For
the operation to decrease the vehicle speed, see page
365.
3, 2: Position for more powerful engine braking
L: Position for maximum engine braking

STARTING AND DRIVING
350Correct
use of the automatic transmission is explained in
the following parts.
(a) Normal driving
(b) Using engine braking
(c) Using the “3”, “2” and “L” positions
(d) Backing up
(e) Parking
(f) Good driving practice
(g) If you cannot shift the selector lever
(h) Driving in second start mode
(a) Normal driving
1“P” (Park) position2“N” (Neutral) position
1. Start the engine as instructed in “How to start the
engine” on page 348.
The transmission must be in “P” or “N”. The engine will not st\
art
in any drive position even if the ignition key is turned to
“START”.

STARTING AND DRIVING
354Vehicles with rear view monitor system —
When the selector lever is shifted into “R” position with the
ignition switch in the “ON” position, rear view monitor system
will
activate. For instructions, see “Rear view monitor system”
on page 358.
(e) Parking
1Brake pedal
2Parking brake lever
3“P” (Park) position
1. Bring the vehicle to a complete stop.
2. Apply the parking brake fully.
3. With the brake pedal held down with your foot, shift the
selector lever to the “P” position.
CAUTION
While the vehicle is moving, never attempt to move the
selector lever into “P” under any circumstances.
Serious mechanical damage and loss of vehicle control
may result.