Scion iA. Service Manual - part 31

496

6-2. Flat Tire

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WARNING

■

Make sure the mounting surfaces of the wheel, hub and lug nuts
are clean before changing or replacing tires
When changing or replacing a tire, not removing dirt and grime from the
mounting surfaces of the wheel, hub and hub bolts is dangerous. The
lug nuts could loosen while driving and cause the tire to come off, result-
ing in an accident.

■

Do not apply oil or grease to lug nuts and bolts and do not tighten
the lug nuts beyond the recommended tightening torque
Applying oil or grease to lug nuts and bolts is dangerous. The lug nuts
could loosen while driving and cause the tire to come off, resulting in an
accident. In addition, lug nuts and bolts could be damaged if tightened
more than necessary.

■

Always securely and correctly tighten the lug nuts
Improperly or loosely tightened lug nuts are dangerous. The wheel
could wobble or come off. This could result in loss of vehicle control and
cause a serious accident.

■

Be sure to reinstall the same nuts you removed or replace them
with metric nuts of the same configuration
Because the wheel studs and lug nuts on your Scion have metric
threads, using a non-metric nut is dangerous. On a metric stud, it would
not secure the wheel and would damage the stud, which could cause
the wheel to slip off and cause an accident.

■

Do not drive with any tires that have incorrect air pressure
Driving on tires with incorrect air pressure is dangerous. Tires with
incorrect pressure could affect handling and result in an accident. When
you check the regular tires’ air pressure, check the spare tire, too.

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6-3. Battery Runs Out

6

If Trou

ble
 Arises

Jump-Starting

Jump-starting is dangerous if done incorrectly. So follow the procedure care-
fully. If you feel unsure about jump-starting, we strongly recommend that you
have a competent service technician do the work.

Jumper cables

Booster battery

Discharged battery

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6-3. Battery Runs Out

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Remove the battery cover.

Make sure the booster battery is 12 V and that its negative terminal
is grounded.

If the booster battery is in another vehicle, do not allow both vehi-
cles to touch. Turn off the engine of the vehicle with the booster bat-
tery and all unnecessary electrical loads in both vehicles.

Connect the jumper cables in the exact sequence as in the illustra-
tion.

• Connect one end of a cable to the positive terminal on the dis-

charged battery (1).

• Attach the other end to the positive terminal on the booster battery

(2).

• Connect one end of the other cable to the negative terminal of the

booster battery (3).

• Connect the other end to the ground point indicated in the illustra-

tion away from the discharged battery (4).

Start the engine of the booster vehicle and run it a few minutes.
Then start the engine of the other vehicle.

When finished, carefully disconnect the cables in the reverse order
described in the illustration.

If the battery cover has been removed, install it in the reverse order
of removal.

Verify that the covers are securely installed.

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6-3. Battery Runs Out

6

If Trou

ble
 Arises

WARNING

■

 Follow These Precautions Carefully

To ensure safe and correct handling of the battery, read the following pre-
cautions carefully before using the battery or inspecting it.

■

 Do not allow the positive (+) terminal to contact any other metal

object that could cause sparks
Flames and sparks near open battery cells are dangerous. Hydrogen gas,
produced during normal battery operation, could ignite and cause the bat-
tery to explode. An exploding battery can cause serious burns and injuries.
When working near a battery, do not allow metal tools to contact the positive
(+) or negative (-) terminal of the battery.

■

 Keep all flames, including cigarettes, and sparks away from

open battery cells
Flames and sparks near open battery cells are dangerous. Hydrogen gas,
produced during normal battery operation, could ignite and cause the bat-
tery to explode. An exploding battery can cause serious burns and injuries.

■

Do not jump-start a frozen battery or one with a low fluid level
Jump-starting a frozen battery or one with a low fluid level is dangerous. It
may rupture or explode, causing serious injury.

■

Connect the negative cable to a good ground point away from the bat-
tery
Connecting the end of the second jumper cable to the negative (-) terminal
of the discharged battery is dangerous.
A spark could cause the gas around the battery to explode and injure some-
one.

■

Route the jumper cables away from parts that will be moving
Connecting a jumper cable near or to moving parts (cooling fans, belts) is
dangerous. The cable could get caught when the engine starts and cause
serious injury.

NOTICE

Use only a 12 V booster system. You can damage a 12 V starter, ignition sys-
tem, and other electrical parts beyond repair with a 24 V power supply (two 12
V batteries in series or a 24 V motor generator set).

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6-4. Emergency Starting

Starting a Flooded Engine

If the engine fails to start, it may be flooded (excessive fuel in the engine).

Follow this procedure:

If the engine does not start within five seconds on the first try, wait
ten seconds and try again.

Make sure the parking brake is on.

Depress the accelerator all the way and hold it there.

Depress the clutch pedal (Manual transaxle) or the brake pedal
(Automatic transaxle), then press the push button start. If the
engine starts, release the accelerator immediately because the
engine will suddenly rev up.

If the engine fails to start, crank it without depressing the accelera-
tor.

If the engine still does not start using the above procedure, have your vehicle
inspected by your Scion dealer.

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6-4. Emergency Starting

6

If Trou

ble
 Arises

Push-Starting

Do not push-start your Scion.

You cannot start a vehicle with an automatic transaxle by pushing it.

WARNING

■

Never tow a vehicle to start it
Towing a vehicle to start it is dangerous. The vehicle being towed could
surge forward when its engine starts, causing the two vehicles to collide.
The occupants could be injured.

NOTICE

Do not push-start a vehicle that has a manual transaxle. It can damage the
emission control system.

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6-5. Overheating

Overheating

If the high engine coolant temperature warning light illuminates:

Drive safely to the side of the road and park off the right-of-way.

Put a vehicle with an automatic transaxle in park (P), a manual tran-
saxle in neutral.

Apply the parking brake.

Turn off the air conditioner.

Check whether coolant or steam is escaping from the engine com-
partment.



If steam is coming from the engine compartment:

Do not go near the front of the vehicle. Stop the engine.
Wait until the steam dissipates, then open the hood and start the
engine.



If neither coolant nor steam is escaping:

Open the hood and idle the engine until it cools.

Make sure the cooling fan is operating, then turn off the engine after
the temperature has decreased.

When cool, check the coolant level.
If it is low, look for coolant leaks from the radiator and hoses.

■

If you find a leak or other damage, or if coolant is still leaking:

Stop the engine and call your Scion dealer.

Cooling fan

Cooling system cap

Coolant reservoir

If the high engine coolant temperature warning light illuminates,
the vehicle loses power, or you hear a loud knocking or pinging
noise, the engine is probably too hot.

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6-5. Overheating

6

If Trou

ble
 Arises

■

If you find no problems, the engine is cool, and no leaks are
obvious:

Carefully add coolant as required (

P. 431).

WARNING

■

 Switch the ignition to off and make sure the fan is not running

before attempting to work near the cooling fan
Working near the cooling fan when it is running is dangerous. The fan could
continue running indefinitely even if the engine has stopped and the engine
compartment temperature is high. You could be hit by the fan and seriously
injured.

■

 Do not remove either cooling system cap when the engine and

radiator are hot
When the engine and radiator are hot, scalding coolant and steam may
shoot out under pressure and cause serious injury.

■

Open the hood ONLY after steam is no longer escaping from the engine
Steam from an overheated engine is dangerous. The escaping steam could
seriously burn you.

NOTICE

●

If the cooling fan does not operate while the engine is running, the engine
temperature will increase. Stop the engine and call your Scion dealer.

●

If the engine continues to overheat or frequently overheats, have the cool-
ing system inspected. The engine could be seriously damaged unless
repairs are made. Consult your Scion dealer.

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6-6. Emergency Towing

Towing Description

We recommend that towing be
done only by your Scion dealer or
a commercial tow-truck service.

Proper lifting and towing are nec-
essary to prevent damage to the
vehicle.
Government and local laws must
be followed.

A towed vehicle usually should
have its drive wheels (front
wheels) off the ground. If exces-
sive damage or other conditions
prevent this, use wheel dollies.

When towing with the rear wheels on the ground, release the parking
brake.

Wheel dollies

NOTICE

●

Do not tow the vehicle pointed back-
ward with driving wheels on the ground.
This may cause internal damage to the
transaxle.

●

Do not tow with sling-type equipment.
This could damage your vehicle. Use
wheel-lift or flatbed equipment.

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6-6. Emergency Towing

6

If Trou

ble
 Arises

Tiedown Hooks



Remove the tiedown eyelet and the lug wrench from the luggage
compartment (

P. 483).

Wrap a jack lever or similar tool
with a soft cloth to prevent dam-
age to a painted bumper, and
open the cap located on the
front bumper.

Securely install the tiedown
eyelet using the lug wrench.

Lug wrench

Tiedown eyelet

Hook the tying rope to the tiedown eyelet.

Remove the cap completely and store it so as not to lose it.



: If equipped

NOTICE

Do not use the front tiedown eyelet for towing the vehicle.

They have been designed only for securing the vehicle to a transport vessel
during shipping.

Using the eyelet for any other purpose could result in the vehicle being dam-
aged.

Tiedown Hook-Front

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6-6. Emergency Towing

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The hook positioned under the
rear bumper on the driver’s side is
for tying down the vehicle during
transport, and it cannot be used
for towing other vehicles. It can be
used as a towing hook only when
the vehicle must be towed by
another vehicle in an emergency
case such as when the vehicle is
stuck in snow, however, it may
damage the bumper.

NOTICE

●

Do not use excessive force as it may damage the cap or scratch the
painted bumper surface.

●

If the tiedown eyelet is not securely tightened, it may loosen or disengage
from the bumper when tying the vehicle. Make sure that the tiedown eyelet
is securely tightened to the bumper.

Tiedown Hook-Rear

Tiedown hook

NOTICE

When using the hook in such emergency cases, observe the following so as
not to damage the tiedown hook or the vehicle body.

●

The vehicle must be pulled straight to the rear so that no load is applied to
the vehicle in the lateral direction.

●

The bumper may be damaged if the tie down hook is used as a towing
hook.

●

When using a metal chain or wire cable, wrap a cloth around the attach-
ment area. If the metal chain or wire cable contacts the bumper directly,
the bumper could be scratched or damaged.

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6-7. Warning/Indicator Lights and Warning Sounds

6

If Trou

ble
 Arises

If a Warning Light Turns On or Flashes

Vehicles with type B audio:

The warning contents can be verified on the audio.

Select the 

 icon on the home screen to display the applica-

tions screen.

Select the “Warning Guidance”.

If any of the following warning lights turns on, the system may have a
malfunction. Stop the vehicle in a safe place immediately and contact
your Scion dealer.

If any warning light turns on/flashes, take appropriate action for
each light. There is no problem if the light turns off, however if
the light does not turn off or turns on/flashes again, consult your
Scion dealer.

Stop Vehicle in Safe Place Immediately

Signal

Warning

Brake System Warning Light

This warning has the following functions:

Parking brake warning/Warning light inspection:

The light illuminates when the parking brake is applied
with the ignition switched to START or ON. It turns off
when the parking brake is fully released.

Low brake fluid level warning:

If the brake warning light remains illuminated even though
the parking brake is released, the brake fluid may be low
or there could be a problem with the brake system. Park
the vehicle in a safe place immediately and contact your
Scion dealer.
In addition, the effectiveness of the braking may diminish
so you may need to depress the brake pedal more
strongly than normal to stop the vehicle.

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6-7. Warning/Indicator Lights and Warning Sounds

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Electronic Brake Force Distribution System Warning

If the electronic brake force distribution control unit deter-
mines that some components are operating incorrectly,
the control unit may illuminate the brake system warning
light and the ABS warning light simultaneously. The prob-
lem is likely to be the electronic brake force distribution
system.

Charging System Warning Light

If the warning light illuminates while driving, it indicates a
malfunction of the alternator or of the charging system. 
Drive to the side of the road and park off the right-of-way.
Consult your Scion dealer. 
Do not continue driving when the charging system warning
light is illuminated because the engine could stop unex-
pectedly.

Engine Oil Warning Light

This warning light indicates low engine oil pressure.
Do not run the engine if the oil pressure is low. Otherwise,
it could result in extensive engine damage.
If the light illuminates or the warning indication is dis-
played while driving:

Drive to the side of the road and park off the right-of-
way on level ground.

Turn off the engine and wait 5 minutes for the oil to
drain back into the oil pan.

Inspect the engine oil level P. 430. If it’s low, add the
appropriate amount of engine oil while being careful
not to overfill.

Do not run the engine if the oil level is low. Otherwise, it
could result in extensive engine damage.

Start the engine and check the warning light.

If the light remains illuminated even though the oil level is
normal or after adding oil, stop the engine immediately
and have your vehicle towed to your Scion dealer.

Signal

Warning

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6-7. Warning/Indicator Lights and Warning Sounds

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If Trou

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(Red)

High Engine Coolant Temperature Warning Light

The light flashes when the engine coolant temperature is
extremely high, and illuminates when the engine coolant
temperature increases further.

Handling Procedure:
Flashing light

Drive slowly to reduce engine load until you can find a
safe place to stop the vehicle and wait for the engine to
cool down.

Illuminated light

This indicates the possibility of overheating. Park the vehi-
cle in a safe place immediately and stop the engine.
Refer to Overheating P. 502.
Do not drive the vehicle with the high engine coolant tem-
perature warning light illuminated. Otherwise, it could
result in damage to the engine.

Power Steering Malfunction Indicator Light

The light illuminates/flashes if the electric power steering
has a malfunction.
If the light illuminates/flashes, stop the vehicle in a safe
place and do not operate the steering wheel. There is no
problem if the light turns off after a while. Contact your
Scion dealer if the light illuminates/flashes continuously.
• If the indicator light illuminates/flashes, the power steer-

ing will not operate normally. If this happens, the steer-
ing wheel can still be operated, however, the operation
may feel heavy compared to normal, or the steering
wheel could vibrate when turning.

• Repeatedly jerking the steering wheel left and right while

the vehicle is stopped or moving extremely slowly will
cause the power steering system to go into protective
mode which will make the steering feel heavy, but this
does not indicate a problem. If this occurs, park the vehi-
cle safely and wait several minutes for the system to
return to normal.

Signal

Warning

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6-7. Warning/Indicator Lights and Warning Sounds

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WARNING

■

Do not drive with the brake system warning light illuminated. Contact
your Scion dealer to have the brakes inspected as soon as possible
Driving with the brake system warning light illuminated is dangerous. It indi-
cates that your brakes may not work at all or that they could completely fail
at any time. If this light remains illuminated, after checking that the parking
brake is fully released, have the brakes inspected immediately.

■

Do not drive with both the ABS warning light and brake warning light
illuminated. Have the vehicle towed to your Scion dealer to have the
brakes inspected as soon as possible:
Driving when the brake system warning light and ABS warning light are illu-
minated simultaneously is dangerous.

When both lights are illuminated, the rear wheels could lock more quickly in
an emergency stop than under normal circumstances.

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6-7. Warning/Indicator Lights and Warning Sounds

6

If Trou

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If any of the following warning lights turns on/flashes, the system may
have a malfunction. Contact your Scion dealer to have your vehicle
inspected.

Contact Authorized your Scion Dealer and Have Vehicle
Inspected

Signal

Warning

Master Warning Light
Vehicles with type B audio:

The light turns on when the system has a malfunction.
Operate the center display and verify the content.
Refer to If a Warning Light Turns On or Flashes on P. 507.

Vehicles without type B audio:

The light illuminates continuously if any one of the follow-
ing occurs. Consult your Scion dealer.
• There is a malfunction in the battery management sys-

tem.

• There is a malfunction in the brake switch.

ABS Warning Light

If the ABS warning light stays on while you’re driving, the
ABS control unit has detected a system malfunction. If this
occurs, your brakes will function normally as if the vehicle
had no ABS.
Should this happen, consult your Scion dealer as soon as
possible.
• When the engine is jump-started to charge the battery,

uneven rpm occurs and the ABS warning light may illu-
minate. If this occurs, it is the result of the weak battery
and does not indicate an ABS malfunction.
Recharge the battery.

• (With DSC vehicles)

The brake assist system does not operate while the
ABS warning light is illuminated.