2011 LEXUS RX350 fuel

456
4-2. Maintenance
Emission inspection and maintenance (I/M) programs
Some states have vehicle emission inspection programs which include
OBD (On Board Diagnostics) checks. The OBD system monitors the oper-
ation of the emission control system.
nIf the malfunction indicator lamp comes on
The OBD system determines that a problem exists somewhere in
the emission control system. Your vehicle may not pass the I/M test
and may need to be repaired. Contact your Lexus dealer to service
the vehicle.
nYour vehicle may not pass the I/M test in the following situations:
lWhen the battery is disconnected or discharged
Readiness codes that are set during ordinary driving are erased.
Also, depending on your driving habits, the readiness codes may
not be completely set.
lWhen the fuel tank cap is loose
The malfunction indicator lamp comes on indicating a temporary
malfunction and your vehicle may not pass the I/M test.
nWhen the malfunction indicator lamp still remains on after several
driving trips
The error code in the OBD system will not be cleared unless the
vehicle is driven 40 or more times.
nIf your vehicle does not pass the I/M test
Contact your Lexus dealer to prepare the vehicle for re-testing.

459
4-3. Do-it-yourself maintenance
4

Maintenance and care
CAUTION
The engine compartment contains many mechanisms and fluids that may move sud-
denly, become hot, or become electrically energized. To avoid death or serious injury,
observe the following precautions:
nWhen working on the engine compartment
lKeep hands, clothing and tools away from the moving fan and engine drive belt.
lBe careful not to touch the engine, radiator, exhaust manifold, etc. right after driv-
ing as they may be hot. Oil and other fluids may also be hot.
lDo not leave anything that may burn easily, such as paper or rags, in the engine
compartment.
lDo not smoke, cause sparks or expose an open flame to fuel or the battery. Fuel
and battery fumes are flammable.
lBe extremely cautious when working on the battery. It contains poisonous and
corrosive sulfuric acid.
nWhen working near the electric cooling fan or radiator grille
Be sure the “ENGINE START STOP” switch is off.
With the “ENGINE START STOP” switch in IGNITION ON mode, the electric
cooling fan may automatically start to run if the air conditioning is on and/or the
coolant temperature is high. (→P. 4 7 2 )
nSafety glasses
Wear safety glasses to prevent flying or falling material, fluid spray, etc. from getting
in the eyes.
NOTICE
nIf you remove the air cleaner filter
Driving with the air cleaner filter removed may cause excessive engine wear due to
dirt in the air. Also a backfire could cause a fire in the engine compartment.

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4-3. Do-it-yourself maintenance
4

Maintenance and care
nTire inflation pressure check interval
You should check tire inflation pressure every two weeks, or at least once a month.
Do not forget to check the spare.
nEffects of incorrect tire inflation pressure
Driving with incorrect tire inflation pressure may result in the following:
lReduced fuel efficiency
lReduced driving comfort and tire life
lReduced safety
lDamage to the drive train
If a tire needs frequent inflating, have it checked by your Lexus dealer.
nInstructions for checking tire pressure
When checking tire inflation pressure, observe the following:
lCheck only when the tires are cold.
If your vehicle has been parked for at least 3 hours and has not been driven for
more than 1 mile or 1.5 km, you will get an accurate cold tire inflation pressure
reading.
lAlways use a tire pressure gauge.
The appearance of the tire can be misleading. In addition, tire inflation pressures
that are even just a few pounds off can degrade ride and handling.
lDo not reduce tire inflation pressure after driving. It is normal for the tire infla-
tion pressure to be higher after driving.
lNever exceed the vehicle capacity weight.
Passengers and luggage weight should be placed so that the vehicle is bal-
anced.

502
4-3. Do-it-yourself maintenance
11PD50 A
Daytime running light system, A/F,
H-LP RH HI, H-LP LH LO, H-LP RH
LO, H-LP LH HI, HORN, S-HORN,
multiplex communication system,
multiport fuel injection system/
sequential multiport fuel injection sys-
tem
12ABS NO. 150 AAnti-lock brake system
13EPS60 AElectric power steering system
14ALT140 A
FUEL OPN, DR LOCK, OBD, RR
FOG, S/ROOF, 4WD, INVERTER,
ECU IG1 NO. 1, ECU IG1 NO. 2,
PANEL, GAUGE NO. 1
15AMP130 AAudio system
16EFI MAIN30 A
Multiport fuel injection system/
sequential multiport fuel injection sys-
tem, EFI NO. 1, EFI NO. 2
17AMP230 AAudio system
18IG230 AStarter system, IGN, GAUGE NO. 2,
ECU IG2
19IP JB25 APower door lock system
20STR LOCK20 AStarter system
21RAD NO. 315 A
Meters and gauges lights, instrument
panel lights, navigation system, audio
system, rear seat entertainment sys-
tem
22HAZ15 AEmergency flashers
FuseAmpereCircuit

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4-3. Do-it-yourself maintenance
4

Maintenance and care
23ETCS10 A
Multiport fuel injection system/
sequential multiport fuel injection sys-
tem
24RAD NO. 110 AAudio system
25AM27. 5 AStarting system
26ECU-B NO. 27. 5 A
Air conditioning system, front passen-
ger occupant classification system,
starter system
27MAYDAY/TEL7. 5 AMayday system
28IMMOBI7. 5 A
29ALT-S7. 5 ACharging system
30IGN10 A
Starter system, multiport fuel injection
system/sequential multiport fuel injec-
tion system
31DOME10 A
Vanity mirror lights, luggage compart-
ment lights, interior lights, personal
lights
32ECU-B NO. 17. 5 A
Interior lights, personal lights, tilt and
telescopic steering, multiplex commu-
nication system, meters and gauges,
power window, driving position mem-
ory system, power seats, power back
door, head-up display, starter system,
air conditioning system, power door
lock system
33EFI NO. 110 A
Multiport fuel injection system/
sequential multiport fuel injection sys-
tem
34WIP-S7. 5 AWindshield wipers and washer
FuseAmpereCircuit

504
4-3. Do-it-yourself maintenance
35AFS7. 5 AAdaptive front-lighting system
36BK/UP LP7. 5 ABack-up lights
37HEATER NO. 27. 5 AAir conditioning system, AWD system
38ECU IG110 A
Adaptive front-lighting system, head-
light cleaner, cooling fan, cruise con-
trol, vehicle stability control, vehicle
dynamics integrated management
39EFI NO. 210 A
Multiport fuel injection system/
sequential multiport fuel injection sys-
tem
40F/ P U M P15 A
Multiport fuel injection system/
sequential multiport fuel injection sys-
tem
41DEICER25 AWindshield wipers and washer
42STOP7. 5 A
Vehicle stability control, vehicle
dynamics integrated management,
high mounted stoplight
43TOW I N G BAT T20 ATrailer battery
44TOW I N G30 ATrailer lights
45FILTER10 ACondenser
46IG1 MAIN30 AECU IG1, BK/UP LP,
HEATER NO. 2, AFS
47H-LP RH HI15 ARight-hand headlight (high beam)
48H-LP LH HI15 ALeft-hand headlight (high beam)
49BIXENON10 ADischarge headlight
50H-LP RH LO15 ARight-hand headlight (low beam)
51H-LP LH LO15 ALeft-hand headlight (low beam)
FuseAmpereCircuit

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4-3. Do-it-yourself maintenance
4

Maintenance and care
nDriver’s side instrument panel
52HORN10 AHorn
53A/F20 A
Multiport fuel injection system/
sequential multiport fuel injection sys-
tem
54S-HORN7. 5 ASecurity horn
FuseAmpereCircuit
1P/ P O I N T15 APo w e r o u t l e t
2ECU-ACC10 A
Navigation system, outside rear view
mirror, multiplex communication sys-
tem, multi-information display, head-
up display
3CIG15 APo w e r o u t l e t
4RADIO NO. 27. 5 AAudio system, power outlet
5GAUGE NO. 110 AEmergency flashers, navigation sys-
tem, head-up display
FuseAmpereCircuit

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4-3. Do-it-yourself maintenance
6ECU-IG1 NO. 310 A
Outside rear view mirror, windshield
wipers and washer, seat heaters,
starter system, power outlet, moon
roof, Automatic High Beam
7ECU-IG1 NO. 110 A
Multiplex communication system,
electric power steering system, shift
lock control system, tilt and telescopic
steering, starter system, automatic
transmission system, power back
door, tire pressure warning system
8S/ROOF30 AMoon roof
9FUEL OPN7. 5 AFuel filler door opener
10PSB30 APre-collision seat belt
11TI & TE30 ATilt and telescopic steering system
12DR LOCK10 APower door lock system
13FR FOG15 AFront fog lights
14P-S E AT L H30 APo w e r s e a t ( l e f t - s i d e )
154WD7. 5 AAW D s y s t e m
16INVERTER20 A
17RR FOG7. 5 A
18D/L ALT B25 AMultiplex communication system
19HEATER10 AAir conditioning system
20ECU-IG1 NO. 210 A
Air conditioning system, multiport fuel
injection system/sequential multiport
fuel injection system, SRS airbag sys-
tem, multi-information display
FuseAmpereCircuit