2008 Lexus IS250 Exhaust

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4-2. Maintenance
08_IS350/250_U_(L/O_0708)
General maintenance
Engine compartment
ItemsCheck points
BatteryMaintenance-free. (→P. 3 0 2 )
Brake fluidAt the correct level? (→P. 3 0 1 )
Engine coolantAt the correct level? (→P. 2 9 9 )
Engine oilAt the correct level? (→P. 2 9 5 )
Exhaust systemNo fumes or strange sounds?
Radiator/condenser/hosesNot blocked with foreign matter?
(
→P. 3 0 1 )
Wa s h e r f l u i dAt the correct level? (→P. 3 0 5 )
Listed below are the general maintenance items that should be performed
at the intervals specified in the “Warranty and Services Guide” or “Owners
Manual Supplement”. It is recommended that any problem you notice
should be brought to the attention of your Lexus dealer or qualified service
shop for advice.

287
4-3. Do-it-yourself maintenance
4
Maintenance and care
08_IS350/250_U_(L/O_0708)
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.
■When working on the engine compartment:
●Keep hands, clothing, and tools away from the moving fan and engine drive belt.
●Be 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.
●Do not leave anything that may burn easily, such as paper or rags, in the engine
compartment.
●Do not smoke, cause sparks or expose an open flame to fuel or the battery. Fuel
and battery fumes are flammable.
●Be extremely cautious when working on the battery. It contains poisonous and
corrosive sulfuric acid.
ItemsParts and tools
Engine oil level (→P. 2 9 5 )
• “Toyota Genuine Motor Oil” or equivalent
• Rag or paper towel, funnel (used
only for adding engine oil)
Fuses (→P. 3 2 7 )• Fuse with same amperage rating as
original
Tire inflation pressure (→P. 316)• Tire pressure gauge
• Compressed air source
Headlight aim (→P. 3 4 1 )• Phillips-head screwdriver
Radiator and condenser (→P. 3 0 1 )
Wa s h e r f l u i d (→P. 3 0 5 )
• Water washer fluid containing anti-freeze (for winter use)
•Funnel

332
4-3. Do-it-yourself maintenance
08_IS350/250_U_(L/O_0708)
FuseAmpereCircuit
10E/G-B60 AFR CTRL-B, ETCS, ALT-S, steering
lock system, exhaust system
11DIESEL GLW80 A
12ABS150 AVSC, VDIM
13RH J/B-B30 APower door lock system, smart access
system with push-button start
14MAIN30 AHeadlight low beams
15STARTER30 ASmart access system with push-button
start
16LH J/B-B30 APower door lock system, SECURITY
17P/ I - B60 A
Multiport fuel injection system/
sequential multiport fuel injection sys-
tem
18EPS80 APo w e r s t e e r i n g
19ALT150 A
LH J/B-AM, E/G-AM, GLW PLG2,
HEATER, FAN1, FAN2, DEFOG,
ABS2, RH J/B-AM, GLW PLG1,
LH J/B-B, RH J/B-B
20GLW PLG150 APTC heater
21RH J/B-AM80 A
OBD, STOP SW, TI&TE, FR P/SEAT
RH, RAD NO.3, ECU-IG RH,
RH-IG, FR S/HTR RH, ACC, CIG,
PWR OUTLET
22ABS230 AVSC
23DEFOG50 ARear window defogger
24FA N 240 AElectric cooling fans
25FA N 140 AElectric cooling fans
26HEATER50 AAir conditioning system

334
4-3. Do-it-yourself maintenance
08_IS350/250_U_(L/O_0708)■
Engine compartment (type B)
FuseAmpereCircuit
1FR CTRL-B25 AHeadlight high beam, horn
2A/F15 AExhaust system
3ETCS10 A
Multiport fuel injection system/
sequential multiport fuel injection sys-
tem
4ALT-S7. 5 ACharging system
5STR LOCK25 ASteering lock
6H-LP CLN30 AHeadlight cleaner
7A/C COMP7. 5 AAir conditioning system
8DEICER25 A
9FR CTRL-AM30 AFront fog lights, parking lights, wind-
shield washer
10IG210 AIgnition system
11EFI NO.210 AFuel system, exhaust system
12H-LP R LWR15 AHeadlight low beam (right)
13H-LP L LWR15 AHeadlight low beam (left)

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5-1. Essential information
08_IS350/250_U_(L/O_0708)
If you think something is wrong
If you notice any of the following symptoms, your vehicle probably needs
adjustment or repair. Contact your Lexus dealer as soon as possible.
■Visible symptoms
●Fluid leaks under the vehicle
(Water dripping from the air conditioning after use is normal.)
● Flat-looking tires or uneven tire wear
● Engine coolant temperature gauge needle continually points
higher than normal
■ Audible symptoms
●Changes in exhaust sound
● Excessive tire squeal when cornering
● Strange noises related to the suspension system
● Pinging or other noises related to the engine
■ Operational symptoms
●Engine missing, stumbling or running rough
● Appreciable loss of power
● Vehicle pulls heavily to one side when braking
● Vehicle pulls heavily to one side when driving on a level road
● Loss of brake effectiveness, sp ongy feeling, pedal almost touches
the floor