2003 TOYOTA TUNDRA spark plugs

’03 TUNDRA_U (L/O 0307)
185
2003 TUNDRA from Jul. ’03 Prod. (OM 34430U)
INFORMATION BEFORE DRIVING YOUR
TOYOTA
Information before driving your Toyota
Off−road vehicle precautions 186
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Break −in period 187
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Fuel 187
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Fuel pump shut off system 189
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Operation in foreign countries 189
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Three −way catalytic converters 190
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Engine exhaust cautions 191
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Facts about engine oil consumption 192
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Twin ground electrode spark plugs 193
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Brake system 193
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Brake pad wear limit indicators 196
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Rear step bumper 196
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StepSide bed 197
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Limited −slip differential 197
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Your Toyota’s identification 197
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Theft prevention labels 199
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Suspension and chassis 199
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Tire information 200
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Vehicle load limits 208
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Cargo and luggage 209
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Types of tires 211
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SECTION 2

’03 TUNDRA_U (L/O 0307)
193
2003 TUNDRA from Jul. ’03 Prod. (OM 34430U)
Your engine is fitted with twin ground
electrode spark plugs.
NOTICE
Use only twin ground electrode spark
plugs for your engine performance.
The tandem master cylinder brake system
is a hydraulic system with two separate
sub−systems. If either sub −system s hould
fail, the other will still work. However, the
pedal will be harder to press, and your
stopping distance will increase. Also, the
brake system warning light may come on.
CAUTION
Do not drive your vehicle with only a
single brake system. Have your
brakes fixed immediately.
BRAKE BOOSTER
The brake booster uses engine vacuum to
power −assist the brakes. If the engine
should quit while you are driving, you can
bring the vehicle to a stop with normal
pedal pressure. There is enough reserved
vacuum for one or two stops—but no
more!
CAUTION
Do not pump the brake pedal if the
engine stalls. Each push on the
pedal uses up your reserved vacu-
um.
Even if the power assist is com-
pletely lost, the brakes will still
work. But you will have to push the
pedal hard, much harder than nor-
mal. And your braking distance will
increase.
ANTILOCK BRAKE SYSTEM
The antilock brake system is designed
to help prevent lockup of the wheels
during a sudden braking or braking on
slippery road surfaces. This assists in
providing directional stability and steer-
ing performance of the vehicle under
these circumstances.
Twin ground electrode spark
plugs (5VZFE engine) Brake system

’03 TUNDRA_U (L/O 0307)
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2003 TUNDRA from Jul. ’03 Prod. (OM 34430U)
CAUTION
When the engine is running, keep
hands, clothing, and tools away
from the moving fan and engine
drive belts. (Removing rings,
watches, and ties is advisable.)
Right after driving, the engine
compartment—the engine, radiator,
exhaust manifold, power steering
fluid reservoir and spark plug
boots, etc.—will be hot. So be care-
ful not to touch them. Oil, fluids
and spark plugs may also be hot.
If the engine is hot, do not remove
the radiator cap or loosen the drain
plugs to prevent burning yourself.
Do not smoke, cause sparks or al-
low open flames around fuel or the
battery. Their fumes are flammable.
Do not get under your vehicle with
just the body jack supporting it. Al-
ways use automotive jack stands or
other solid supports.
Use eye protection whenever you
work on or under your vehicle
where you may be exposed to flying
or falling material, fluid spray, etc.
Used engine oil contains potentially
harmful contaminants which may
cause skin disorders such as in-
flammation or skin cancer, so care
should be taken to avoid prolonged
and repeated contact with it. To re-
move used engine oil from your
skin, wash thoroughly with soap
and water.
Do not leave used oil within the
reach of children.
Dispose of used oil and filter only
in a safe and acceptable manner.
Do not dispose of used oil and fil-
ter in household trash, in sewers or
onto the ground. Call your dealer or
a service station for information
concerning recycling or disposal.
Be extremely cautious when work-
ing on the battery. It contains poi-
sonous and corrosive sulfuric acid.
Warning: Battery posts, terminals
and related accessories contain lead
and lead compounds, chemicals
known to the State of California to
cause cancer and reproductive
harm. Wash hands after handling.
NOTICE
Remember that battery and ignition
cables carry high currents or volt-
ages. Be careful of accidentally
causing a short circuit.
 Add only demineralized or distilled
water to fill the radiator. And if you
spill some of the coolant, be sure
to wash it off with water to prevent
it from damaging the parts or paint.
 Do not allow dirt or anything else
to fall through the spark plug holes.
 Do not pry the outer electrode of a
spark plug against the center elec-
trode.
 Use only spark plugs of the speci-
fied type. Using other types will
cause engine damage, loss of per-
formance or radio noise.
 Do not overfill automatic transmis-
sion fluid, or the transmission
could be damaged.
 Do not drive with the air cleaner
filter removed, or excessive engine
wear could result. Also backfiring
could cause a fire in the engine
compartment.

’03 TUNDRA_U (L/O 0307)
5
2003 TUNDRA from Jul. ’03 Prod. (OM 34430U)
Rear console box173,174
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Rear side windows 20
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Rear step bumper 196
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Rear view mirror
Anti −glare inside 88
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Rear view mirrors
Folding 88
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Outside 87
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Power 87
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Rear window 21
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Remote keyless entry system 14,258 . . . . . .
Reporting safety defects for U.S.
owners 320
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S
Seat adjustment precautions
Front seats 31 . . . . . . . . . . . . . . . . . . . . . . . . .
Seat belt extender 43 . . . . . . . . . . . . . . . . . . . . .
Seat belts
Cleaning 262 . . . . . . . . . . . . . . . . . . . . . . . . . .
Fastening 38 . . . . . . . . . . . . . . . . . . . . . . . . . .
Seat belt precautions 38 . . . . . . . . . . . . . . . .
Seat belt pretensioners 45 . . . . . . . . . . . . . .
Seating capacity 208 . . . . . . . . . . . . . . . . . . . . .
Seats 30 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Security system 24 . . . . . . . . . . . . . . . . . . . . . . .
Service and maintenance 266 . . . . . . . . . . . . .
Service reminder indicator 104 . . . . . . . . . . . .
Side steps 197 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Spare fuse 298 . . . . . . . . . . . . . . . . . . . . . . . . . .
Spare tire 241,242 . . . . . . . . . . . . . . . . . . . . . . .
Spark plugs
Twin ground electrode spark plugs 193 . . . . . . . . . . . . . . . . . . . . . . . . . . . Specifications 308
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SRS driver airbag and front passenger airbag 47 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SRS warning light 104 . . . . . . . . . . . . . . . . . . . .
Starting
Cold weather 214 . . . . . . . . . . . . . . . . . . . . . .
Engine 214 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Jump starting 235 . . . . . . . . . . . . . . . . . . . . . .
Steering
Tilt steering wheel 86 . . . . . . . . . . . . . . . . . . .
Steering column
Column lock 112 . . . . . . . . . . . . . . . . . . . . . . .
Steering switches, Audio remote control 150 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
StepSide bed 197 . . . . . . . . . . . . . . . . . . . . . . . .
Sun visors 89 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Suspension and chassis 199 . . . . . . . . . . . . . .
Swing −up rear seats 36 . . . . . . . . . . . . . . . . . . .
Switch
Emergency flasher 93 . . . . . . . . . . . . . . . . . .
Headlight, dimmer and turn signal 92 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ignition 112 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Outside rear view mirror heaters 98 . . . . . .
Overdrive 113 . . . . . . . . . . . . . . . . . . . . . . . . .
Passenger airbag manual on −off 56 . . . . . .
Windshield wiper and washer 96,97 . . . . . .
T
Tachometer 102
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Tailgate 22
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Theft prevention labels 199
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Three −way catalytic converters 190 . . . . . . . .
Tilt steering wheel 86
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Changing 239
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Checking and replacing 289
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Flat tire 239
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Inflation pressure 286,316
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Replacing wheels 294
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Rotating tires 291
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Size 202,316
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Snow tires and chains 292
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Spare 241,242
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Symbols 200
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Tire Identification Number (TIN) 201 . . . . . .
Tire related terms 205
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Tools 241,242
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To w i n g
Capacity 208
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Dinghy towing 219
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Emergency towing 254,255
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Emergency towing hook precautions 256
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If your vehicle needs to be towed 252
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Tips for towing a stuck vehicle 257 . . . . . . .
Trailer 220
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Toyota vehicle intrusion protection system 24
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Trailer towing 220
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Trip meter 103
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Turn signals 92
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TVIP 24
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Types of tires 211
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