2005 Lexus GX470 fuel pump

IMPORTANT INFORMATION ABOUT YOUR LEXUS
vi
Tires and loading on your Lexus
Underinflated or overinflated tire pressure and the
excess load may result in the deterioration of steering
ability and braking ability, leading to an accident.
Check the tire inflation pressure periodically and be
sure to keep the load limits given in this Owner's
Manual. For details about tire inflation pressure and
load limits, see pages 574 and 483.
Scrapping of your Lexus
The SRS airbag and seat belt pretensioner devices in your
Lexus contain explosive chemicals. If the vehicle is scrapped
with the airbags and seat belt pretensioners left as they are,
this may cause an accident such as a fire. Be sure to have the
systems of the SRS airbag and seat belt pretensioner removed
and disposed of by a qualified service shop or by your Lexus
dealer before you scrap your vehicle.
On±pavement and off±road driving tips
This vehicle belongs to the utility vehicle class. Utility vehicles
have a significantly higher rollover rate than other types of
vehicles. This vehicle will handle and maneuver differently
from an ordinary passenger car because it is designed for
off±road use also. In addition, this vehicle has a higher ground
clearance and center of gravity than that of an ordinary
passenger car. This vehicle design feature causes this type of
vehicle to be more likely to rollover. Failure to operate this
vehicle correctly may result in loss of control, accidents or
vehicle rollover causing death or serious injury. Be sure to read
ªOff±road vehicle precautionsº on page 459 and ªOff±road
driving precautionsº on page 464.
Leak detection pump
This pump performs fuel evaporation leakage check. This
check is done approximately five hours after the engine is
turned off. So you may hear sound coming from underneath
the luggage compartment for several minutes. It does not
indicate a malfunction.

SECTION 6 ± 2
545
SERVICE PROCEDURES AND
SPECIFICATIONS
Engine
Specifications546
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Fuel 550
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Fuel pump shut off system 553
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Facts about engine oil consumption 553
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Used engine oil 554
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Checking the engine oil level 555
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Checking the engine coolant level 560
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Checking the radiator and condenser 563
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Spark plugs 564
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ENGINE
550
FUEL
Fuel type
Your vehicle must use only unleaded gasoline.
To help prevent gas station mixups, your Lexus has a smaller
fuel tank opening. The special nozzle on pumps with unleaded
fuel will fit it, but the larger standard nozzle on pumps with
leaded gas will not. At a minimum, the gasoline you use should meet the
specifications of ASTM D4814 in the U.S.A. and CGSB
3.5±M93 in Canada.
NOTICE
Do not use leaded gasoline. Use of leaded gasoline will
cause the three±way catalytic converter to lose itseffectiveness and the emission control system tofunction improperly. Also, this can increasemaintenance costs.

ENGINE
553
FUEL PUMP SHUT OFF SYSTEM
The fuel pump shut off system stops supplying fuel to the
engine to minimize the risk of fuel leakage when the engine
stalls or an airbag inflates upon collision. To restart the engine
after the fuel pump shut off system activates, turn the ignition
switch to ªACCº or ªLOCKº once and start it.
CAUTION
Inspect the ground under the vehicle before restarting
the engine. If you find that liquid has leaked onto the
ground, it is the fuel system that has been damaged and
it is in need of repair. In this case, do not restart the
engine.
FACTS ABOUT ENGINE OILCONSUMPTION
Functions of engine oil
Engine oil has the primary function of lubricating and cooling
the inside of the engine, and plays a major role in maintaining
the engine in proper working order.
Engine oil consumption
It is normal that an engine should consume some engine
oil during normal engine operation. The causes of oil
consumption in a normal engine are as follows.
Oil is used to lubricate pistons, piston rings and cylinders.
A thin film of oil is left on the cylinder wall when a piston
moves downwards in the cylinder. High negative pressure
generated when the vehicle is decelerating sucks some of
this oil into the combustion chamber. This oil as well as
some part of the oil film left on the cylinder wall is burned by
the high temperature combustion gases during the
combustion process.
 Oil is also used to lubricate the stems of the intake valves.
Some of this oil is sucked into the combustion chamber
together with the intake air and is burned along with the fuel.
High temperature exhaust gases also burn the oil used to
lubricate the exhaust valve stems.

ELECTRICAL COMPONENTS
604
33ABSSOL30
Anti±lock brake system,
vehicle stability control system,
active traction control system,
brake assist system
No.FUSEAMPERECIRCUIT
34ALT±S7.5Charging system
35MAYDAY7.5No circuit
36HORN10Horns
37A/F
HEATER15A/F sensor
38TRN±HAZ15Turn signal lights
39ETCS10Electronic throttle control system
40EFI20Multiport fuel injection
system/sequential multiport fuel
injection system
41D FR P/W20Power window
42DR/LCK25Power door lock
43TOWING30Towing converter
44RADIO NO.230Audio system, navigation
system
45A/PUMP50Multiport fuel injection
system/sequential multiport fuel
injection system
46IGN10
Multiport fuel injection
system/sequential multiport fuel
injection system, vehicle
stability control system