2003 TOYOTA AVALON ECU

’03 AVALON U (L/O 0206)
2462003 AVALON (OM41401U)
8. Reinstall all the wheel nuts finger
tight.
Reinstall the wheel nuts (tapered end in-
ward) and tighten them as much as you
can by hand. Press back on the tire and
see if you can tighten them more.
CAUTION
Never use oil or grease on the bolts
or nuts. Doing so may lead to over-
tightening the nuts and damaging the
bolts. The nuts may loose and the
wheels may fall off, which could cau-
se a serious accident. If there is oil
or grease on any bolt or nut, clean
it.
9. Lower the vehicle completely and
tighten the wheel nuts.
Turn the jack handle counterclockwise to
lower the vehicle.
Use only the wheel nut wrench and turn
it clockwise to tighten the nuts. Do not
use other tools or any additional leverage
other than your hands, such as a hammer,
pipe or your foot. Make sure the wrench
is securely engaged over the nut.
Tighten each nut a little at a time in the
order shown. Repeat the process until all
the nuts are tight.
—Reinstalling wheel nuts —Lowering your vehicle

’03 AVALON U (L/O 0206)
2472003 AVALON (OM41401U)
CAUTION
When lowering the vehicle, make
sure all portions of your body and
all other persons around will not be
injured as the vehicle is lowered to
the ground.
Have the wheel nuts tightened by
torque wrench at 103 N·m (10.5
kgf·m, 76 ft·lbf), as soon as pos-
sible after changing wheels. Other-
wise, the nuts may loosen and the
wheels may fall off, which could
cause a serious accident.
10. Reinstall the wheel ornament.
Align the cutout of the wheel ornament
with the valve stem as shown. Then tap
it firmly with the side or heel of your hand
to snap it into place.
CAUTION
Take due care in handling the orna-
ment to avoid unexpected personal
injury.
11. Check the air pressure of the re-
placed tire.
Adjust the air pressure to the specification
designated in Section 8. If the pressure is
lower, drive slowly to the nearest service
station and fill to the correct pressure.
Do not forget to reinstall the tire inflation
valve cap as dirt and moisture could get
into the valve core and possibly cause air
leakage. If the cap is missing, have a new
one put on as soon as possible.
12. Restow all the tools, jack and flat
tire securely.
As soon after changing wheels as pos-
sible, tighten the wheel nuts to the torque
specified in Section 8 with a torque
wrench. Have a technician repair the flat
tire and replace the spare tire with it.
—Reinstalling wheel ornament
(steel wheels only)—After changing wheels

’03 AVALON U (L/O 0206)
2482003 AVALON (OM41401U)
CAUTION
Before driving, make sure all the
tools, jack and flat tire are securely
in place in their storage location to
reduce the possibility of personal in-
jury during a collision or sudden
braking.
If your vehicle becomes stuck in snow,
mud, sand, etc., then you may attempt
to rock the vehicle free by moving it
forward and backward.
If your vehicle is equipped with the
traction control system, turn off the
system to become unstuck. (For details,
see “Traction control system” in Sec-
tion 16.)
CAUTION
Do not attempt to rock the vehicle
free by moving it forward and back-
ward if people or objects are any-
where near the vehicle. During the
rocking operation the vehicle may
suddenly move forward or backward
as it becomes unstuck, causing injury
or damage to nearby people or ob-
jects.
NOTICE
If you rock your vehicle, observe the
following precautions to prevent dam-
age to the transmission and other
parts.
Do not depress the accelerator ped-
al while shifting the selector lever
or before the transmission is com-
pletely shifted to forward or reverse
gear.
Do not race the engine and avoid
spinning the wheels.
If your vehicle remains stuck after
rocking the vehicle several times,
consider other ways such as tow-
ing.
If your vehicle becomes stuck

’03 AVALON U (L/O 0206)
2512003 AVALON (OM41401U)
CAUTION
Use extreme caution when towing ve-
hicles. Avoid sudden starts or erratic
driving maneuvers which would place
excessive stress on the emergency
towing eyelets and towing cable or
chain. The eyelets and towing cable
or chain may break and cause serious
injury or damage.
NOTICE
Use only a cable or chain specifically
intended for use in towing vehicles.
Securely fasten the cable or chain to
the towing eyelets provided.
Before towing, release the parking brake
and put the transmission in “N”. The key
must be in “ACC” (engine off) or “ON”
(engine running).
CAUTION
If the engine is not running, the pow-
er assist for the brakes and steering
will not work so steering and braking
will be much harder than usual.
If you cannot shift the selector lever
out of “P” position to other positions
even though the brake pedal is de-
pressed, use the shift lock override but-
ton as follows:
1. Turn the ignition key to “LOCK”
position. Make sure the parking
brake is applied.
2. Pry up the cover with a flatbladed
screwdriver or equivalent.3. Insert your finger into the hole to
push down the shift lock override
button. You can shift out of “P”
position only while pushing the but-
ton.
4. Shift into “N” position.
5. Insert the cover.
6. Start the engine. For your safety,
keep the brake pedal depressed.
Be sure to have the system checked by
your Toyota dealer as soon as possible.
If you cannot shift automatic
transmission selector lever
(floor shift type)

’03 AVALON U (L/O 0206)
2632003 AVALON (OM41401U)
What about doityourself maintenance?
Many of the maintenance items are easy
to do yourself if you have a little mechani-
cal ability and a few basic automotive
tools. Simple instructions for how to per-
form them are presented in Section 7.
If you are a skilled doityourself mechan-
ic, the Toyota service manuals are recom-
mended. Please be aware that doityour-
self maintenance can affect your warranty
coverage. See “Owner ’s Warranty Informa-
tion Booklet” or “Owner ’s Manual Supple-
ment” for the details.Listed below are the general maintenance
items that should be performed as fre-
quently as specified. In addition to check-
ing the items listed, if you notice any
unusual noise, smell or vibration, you
should investigate the cause or take your
vehicle to your Toyota dealer or a quali-
fied service shop immediately. It is recom-
mended that any problem you notice be
brought to the attention of your dealer or
the qualified service shop for their advice.
CAUTION
Make these checks only where ade-
quate ventilation can be obtained if
you run the engine.
OUTSIDE THE VEHICLE
Items listed below should be performed
from time to time, unless otherwise
specified.
Tire pressure
Check the pressure with a gauge every
two weeks, or at least once a month. See
Section 72 for additional information.Tire surface and wheel nuts
Check the tires carefully for cuts, damage
or excessive wear. See Section 72 for
additional information. When checking the
tires, make sure no nuts are missing, and
check the nuts for looseness. Tighten
them if necessary.
Tire rotation
Rotate the tires according to the mainte-
nance schedule. (For scheduled mainte-
nance information, please refer to the
“Scheduled Maintenance Guide” or “Own-
er ’s Manual Supplement”.) See Section
72 for additional information.
Fluid leaks
Check underneath for leaking fuel, oil, wa-
ter or other fluid after the vehicle has
been parked for a while. If you smell fuel
fumes or notice any leak, have the cause
found and corrected immediately.
Doors and engine hood
Check that all doors including trunk lid
operate smoothly and all latches lock se-
curely. Make sure the engine hood sec-
ondary latch secures the hood from open-
ing when the primary latch is released.
General maintenance

’03 AVALON U (L/O 0206)
2642003 AVALON (OM41401U)
INSIDE THE VEHICLE
Items listed below should be checked
regularly, e.g. while performing periodic
services, cleaning the vehicle, etc.
Lights
Make sure the headlights, stop lights, tail
lights, turn signal lights, and other lights
are all working. Check headlight aim.
Service reminder indicators and warning
buzzers
Check that all service reminder indicators
and warning buzzers function properly.
Steering wheel
Check that it has the specified free play.
Be alert for changes in steering condition,
such as hard steering or strange noise.
Seats
Check that all front seat controls such as
seat adjusters, seatback recliner, etc. op-
erate smoothly and that all latches lock
securely in any position. Check that the
head restraints move up and down
smoothly and that the locks hold securely
in any latched position.
Seat belts
Check that the seat belt system such as
buckles, retractors and anchors operate
properly and smoothly. Make sure the belt
webbing is not cut, frayed, worn or dam-
aged.Accelerator pedal
Check the pedal for smooth operation and
uneven pedal effort or catching.
Brake pedal
Check the pedal for smooth operation and
that the pedal has the proper clearance.
Check the brake booster function.
Brakes
At a safe place, check that the brakes do
not pull to one side when applied.
Parking brake
Check that the pedal has the proper travel
and that, on a safe incline, your vehicle
is held securely with only the parking
brake applied.
Automatic transmission “Park” mecha-
nism
Check the lock release button of the se-
lector lever for proper and smooth opera-
tion. On a safe incline, check that your
vehicle is held securely with the selector
lever in “P” position and all brakes re-
leased.IN THE ENGINE COMPARTMENT
Items listed below should be checked
from time to time, e.g. each time when
refueling.
Washer fluid
Make sure there is sufficient fluid in the
tank. See Section 73 for additional infor-
mation.
Engine coolant level
Make sure the coolant level is between
the “FULL” and “LOW” lines on the see
through reservoir when the engine is cold.
See Section 72 for additional information.
Radiator, condenser and hoses
Check that the front of the radiator and
condenser are clean and not blocked with
leaves, dirt, or insects. See in Section
72 for additional information.
Battery condition
Check the battery condition by the indica-
tor color. See Section 73 for additional
information.
Brake fluid level
Make sure the brake fluid level is correct.
See Section 72 for additional information.

’03 AVALON U (L/O 0206)
3042003 AVALON (OM41401U)
Engine compartment
Engine compartment
Fuses (type A)
1. HEAD RH UPR 10 A: No circuit
2. HEAD LH UPR 10 A: No circuit
3. HEAD RH LWR 15 A: Righthand
headlight (low beam)
4. HEAD LH LWR 15 A: Lefthand head-
light (low beam)
5. ABS NO.4 5 A: Vehicle skid control
system
6. DRL 7.5 A: Daytime running light sys-
tem
7. SPARE 30 A: Spare fuse
8. SPARE 15 A: Spare fuse
Instrument panel
9. SPARE 25 A: Spare fuse
10. SPARE 10 A: Spare fuse
11. ALTS 5 A: Charging system
12. DCC 30 A: “DOME”, “ECUB” and
“RADIO” fuses
13. SECURITY 10 A: Theftdeterrent sys-
tem
14. HAZ 15 A: Turn signal lights
15. A/F 25 A: Air/fuel sensor
16. DOOR NO.2 15 A: Power door lock
system
17. HORN 10 A: Horn, theftdeterrent sys-
tem
Fuses

’03 AVALON U (L/O 0206)
3052003 AVALON (OM41401U)
18. AM2 10 A: SRS airbag system, multi-
port fuel injection system/sequential
multiport fuel injection system, starter
system, charging system, air/fuel sen-
sor, fuel pump
19. EFI NO.2 7.5 A: Multiport fuel injection
system/sequential multiport fuel injec-
tion system, air flow meter, oxygen
sensor, evaporative emission control
system, throttle positioner control sys-
tem, engine control system
20. ABS NO.3 25 A: Antilock brake sys-
tem
21. ABS NO.2 25 A: Vehicle skid control
system
22. EFI NO.1 15 A: Multiport fuel injection
system/sequential multiport fuel injec-
tion system, fuel pump
23. IG2 15 A: Multiport fuel injection sys-
tem/sequential multiport fuel injection
system
24. HEAD LH UPR 10 A: Lefthand head-
light (high beam), high beam indicator
light
25. HEAD RH UPR 10 A: Righthand
headlight (high beam)
26. ECUIG NO.1 5 A: Electric cooling
fans27. ECUB 7.5 A: Air conditioning system,
theft deterrent system, power seats,
meters, power windows (for driver and
front passenger), multiplex communica-
tion system
28. TAIL 10 A: Parking lights, license plate
lights, tail lights, rear side marker
lights, rear light failure warning light,
engine control system
29. SEAT HTR 20 A: Seat heaters
30. FR P/W 20 A: Power window (for front
passenger)
31. GAUGE NO.1 10 A: Vehicle skid con-
trol system, rear window defogger,
cruise control system, shift lock sys-
tem, antilock brake system, auto anti
glare inside rear view mirror, automatic
light control system, power seats, rear
light failure warning light, automatic
transmission indicator lights, power out-
let, power window (for driver), brake
system warning light, electric moon
roof
32. HTR 10 A: Air conditioning system
33. FOG 15 A: Front fog lights
34. TURN 7.5 A: Turn signal lights
35. A/C 10 A: Air conditioning system
36. RADIO 15 A: Audio system, multiin-
formation display37. PANEL 5 A: Gauges and meters, audio
system, cigarette lighter, air condition-
ing system, emergency flasher, elec-
tronically controlled automatic transmis-
sion system, power rear view mirrors,
multiinformation display, glove box
light, instrument panel lights, instrument
panel light control, power outlet
38. FL P/W 25 A: Power window (for driv-
er)
39. PWR OUTLET NO.1 15 A: Power out-
let (ACC)
40. ECUACC 5 A: Audio system, power
rear view mirrors, multiinformation dis-
play, shift lock system, multiplex com-
munication system
41. SRSACC 10 A: SRS airbag system
42. MIR HTR 10 A: Outside rear view mir-
ror defoggers, engine control system
43. PWR OUTLET NO.2 15 A: Power out-
let (IG)
44. GAUGE NO.2 10 A: Backup lights
45. OBDII 7.5 A:
Onboard diagnosis sys-
tem
46. STOP 15 A: Stop lights, high mounted
stoplight, antilock brake system, shift
lock system, cruise control system, ve-
hicle skid control system, engine con-
trol system