2010 Lexus GX460 check engine

329
2-4. Using other driving systems
2
When driving
GX460_U.S.A. (OM60E69U)
■Operating tips
The system will operate when the shift lever is in a position other than P, however to
make effective use of the system it is recommended that the shift lever be shifted to
2 or 1 range of S mode.
■If the four-wheel drive control switch is in H4
The system does not operate.
■When the downhill assist control system is operated continuously
This may cause the brake actuator to overheat. In this case, the downhill assist con-
trol system will stop operating, a buzzer will sound and the DAC indicator will start
flashing, and the TRAC OFF will be shown on the multi-information display. Refrain
from using the system until the DAC indicator stays on and the message goes off.
(The vehicle can be driven normally during this time.)
■Sounds and vibrations caused by the DAC
●A sound may be heard from the engine compartment when the engine is
started or just after the vehicle begins to move. This sound does not indicate that
a malfunction has occurred in DAC.
●Either of the following conditions may occur when the DAC is operating. None
of these are indicators that a malfunction has occurred.
• Vibrations may be felt through the vehicle body and steering.
• A motor sound may be heard after the vehicle comes to a stop.
■System malfunction
●The DAC indicator does not come on when the “ENGINE START STOP”
switch is turned to IGNITION ON mode.
●The “DAC” indicator does not come on when the “DAC” switch is pressed.
●The slip indicator comes on.
In the above cases, have your vehicle checked by your Lexus dealer.

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2-5. Driving information
GX460_U.S.A. (OM60E69U)
NOTICE
■To prevent the water damage
Take all necessary safety measures to ensure that water damage to the engine or
other components does not occur.
●Water entering the engine air intake will cause severe engine damage.
●Water entering the automatic transmission wi ll cause deterioration in shift quality,
locking up of your transmission accompanied by vibration, and ultimately dam-
age.
●Water can wash the grease from wheel bearings, causing rusting and premature
failure, and may also enter the differentials, transmission and transfer case, reduc-
ing the gear oil’s lubricating qualities.
■When you drive through water
If driving through water, such as when crossing shallow streams, first check the
depth of the water and the bottom of the riverbed for firmness. Drive slowly and
avoid deep water.
■Inspection after off-road driving
●Sand and mud that has accumulated in brake drums and around brake discs may
affect braking efficiency and may damage brake system components.
●Always perform a maintenance inspection after each day of off-road driving that
has taken you through rough terrain, sand, mud, or water. For scheduled mainte-
nance information, refer to the “Warrant y and Services Guide”, “Owner’s Manual
Supplement” or “Scheduled Maintenance”.

361
2-5. Driving information
2
When driving
GX460_U.S.A. (OM60E69U)
Winter driving tips
Carry out the necessary preparations and inspections before driving the
vehicle in winter. Always drive the vehicle in a manner appropriate to the
prevailing weather conditions.
■ Pre-winter preparations
●Use fluids that are appropria te to the prevailing outside tempera-
tures.
• Engine oil
• Engine coolant
• Washer fluid
● Have a service technician inspect th e level and specific gravity of
battery electrolyte.
● Have the vehicle fitted with four snow 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.
■ Before driving the vehicle
Perform the following accord ing to the driving conditions:
● Do not try to forcibly open a w indow or move a wiper that is fro-
zen. Pour warm water over the frozen area to melt the ice. Wipe
away the water immediately to prevent 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 accumul ated on the vehicle chassis.
● Periodically check for and remove any excess ice or snow that
may have accumulated in the wheel well or on the brakes.

378
2-5. Driving information
GX460_U.S.A. (OM60E69U)●
Avoid jerky starts or sudden acceleration.
● Avoid jerky steering and sharp turns, and slow down before making
turns.
● Note that when making a turn, the tr ailer wheels will be closer than the
vehicle wheels to the inside of the turn. Compensate by making a
larger than normal turning radius.
● Crosswinds and rough roads will adve rsely affect handling of your
vehicle and trailer, causing sway. Periodically check the rear to prepare
for being passed by large trucks or buses, which may cause your vehi-
cle and trailer to sway. If swaying occurs, firmly grip the steering wheel,
reduce speed immediately but gradua lly, 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. 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 eng ine braking and electrical charging
performance, do not use overdrive. Transmission shift range position
must be in 5, in S mode.
● Due to the added load of the trailer, 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. (
P. 74 4 )

Maintenance and care4
587
GX460_U.S.A. (OM60E69U)
4-1. Maintenance and careCleaning and protecting 
the vehicle exterior............ 588
Cleaning and protecting 
the vehicle interior .............. 592 4-2. Maintenance
Maintenance 
requirements........................ 595
General maintenance ........... 597
Emission inspection and 
maintenance (I/M) 
programs ................................ 601
4-3. Do-it-yourself maintenance Do-it-yourself service 
precautions ........................... 602
Hood .......................................... 607
Engine compartment ........... 608
Tires............................................. 627
Tire inflation pressure........... 634
Wheels ...................................... 638
Air conditioning filter ........... 640
Electronic key battery.......... 642
Checking and replacing 
fuses ........................................ 645
Headlight aim (vehicles with low 
beam halogen bulbs) ......... 658
Light bulbs ................................ 660

597
4-2. Maintenance
4
Maintenance and care
GX460_U.S.A. (OM60E69U)
General maintenance
Engine compartment
ItemsCheck points
BatteryCheck the indicator and 
connections. ( P. 622)
Brake fluidIs the brake fluid at the correct level? 
(  P. 6 1 8 )
Engine coolantIs the engine coolant at the correct
level? ( P. 6 1 5 )
Engine oilIs the engine oil at the correct level? 
( P. 6 1 0 )
Exhaust systemThere should not be any fumes or
strange sounds.
Power steering fluidIs the power steering fluid at the 
correct level? ( P. 6 2 0 )
Radiator/condenser
The radiator and condenser should
be free from foreign objects. 
( P. 6 1 7 )
Wa s h e r f l u i dIs there sufficient washer fluid? 
(  P. 6 2 6 )
Listed below are the general maintenance items that should be performed
at the intervals specified in the “Warranty and Service Guide” or “Owner’s
Manual Supplement”. It is recommend ed that any problem you notice
should be brought to the attention of your Lexus dealer or qualified service
shop for advice.

600
4-2. Maintenance
GX460_U.S.A. (OM60E69U)
Vehicle exterior
ItemsCheck points
Doors• Do the doors operate smoothly?
Engine hood• Does the engine hood lock system work properly?
Fluid leaks
• There should not be any signs of fluid leakage after the vehicle has
been parked.
Ti r e
• Is the tire inflation pressure cor-
rect?
• The tires should not be damaged or excessively worn.
• Have the tires been rotated according to the maintenance
schedule?
• The wheel nuts should not be loose.
CAUTION
■If the engine is running
Turn off the engine and ensure that there is adequate ventilation before performing
maintenance checks.

610
4-3. Do-it-yourself maintenance
GX460_U.S.A. (OM60E69U)
Engine oilWith the engine at operating temperat ure and turned off, check the oil
level on the dipstick.
■ Checking the engine oil
Park the vehicle on level ground. After turning off the engine wait
more than five minutes for the oil to drain ba ck into the bottom of
the engine.
Holding a rag under the end, pull
the dipstick out.
Wipe the dipstick clean.
Reinsert the dipstick fully.
Holding a rag under the end, pull the dipstick out and check the
oil level.
Wipe the dipstick and reinsert it fully.
Low
Full
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