Scion tC. Service Manual - part 21

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NOTICE

■

Repairing or replacing tires, wheels, tire pressure warning valves,
transmitters and tire valve caps (U.S.A. only)

●

When removing or fitting the wheels, tires or the tire pressure warning
valves and transmitters, contact your Scion dealer as the tire pressure
warning valves and transmitters may be damaged if not handled cor-
rectly.

●

When replacing tire valve caps, do not use tire valve caps other than
those specified. The cap may become stuck.

■

To avoid damage to the tire pressure warning valves and transmit-
ters (U.S.A. only)

When a tire is repaired with liquid sealants, the tire pressure warning
valve and transmitter may not operate properly. If a liquid sealant is
used, contact your Scion dealer or other qualified service shop as soon
as possible. Make sure to replace the tire pressure warning valve and
transmitter when replacing the tire. (

P. 315)

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NOTICE

■

Driving on rough roads

Take particular care when driving on roads with loose surfaces or pot-
holes.
These conditions may cause losses in tire inflation pressure, reducing
the cushioning ability of the tires. In addition, driving on rough roads may
cause damage to the tires themselves, as well as the vehicle’s wheels
and body.

■

Low profile tires

Low profile tires may cause greater damage than usual to the tire wheel
when sustaining impact from the road surface. Therefore, pay attention
to the following:

●

Be sure to use proper tire inflation pressure. If tires are under-inflated,
they may be damaged more severely.

●

Avoid potholes, uneven pavement, curbs and other road hazards. Fail-
ure to do so may lead to severe tire and wheel damage.

■

If tire inflation pressure of each tire becomes low while driving

Do not continue driving, or your tires and/or wheels may be ruined.

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Tire inflation pressure

■

Tire inflation pressure

The recommended cold tire inflation pressure and tire size are
displayed on the tire and loading information label. (

P. 439)

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■

Tire 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.

■

Inspection and adjustment procedure

Tire valve

Tire pressure gauge

Remove the tire valve cap.

Press the tip of the tire pressure gauge onto the tire valve.

Read the pressure using the gauge gradations.

If the tire inflation pressure is not at the recommended
level, adjust the pressure.
If you add too much air, press the center of the valve to
deflate.

After completing the tire inflation pressure measurement
and adjustment, apply soapy water to the valve and check
for leakage.

Put the tire valve cap back on.

STEP 

1 

STEP 

2 

STEP 

3 

STEP 

4 

STEP 

5 

STEP 

6 

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■

Effects of incorrect tire inflation pressure

Driving with incorrect tire inflation pressure may result in the following:

●

Reduced fuel economy

●

Reduced driving comfort and poor handling

●

Reduced tire life due to wear

●

Reduced safety

●

Damage to the drive train

If a tire needs frequent inflating, have it checked by your Scion dealer.

■

Instructions for checking tire inflation pressure

When checking tire inflation pressure, observe the following:

●

Check only when the tires are cold.
If your vehicle has been parked for at least 3 hours or has not been
driven for more than 1 mile or 1.5 km, you will get an accurate cold
tire inflation pressure reading.

●

Always use a tire pressure gauge.
It is difficult to judge if a tire is properly inflated based only on its
appearance.

●

It is normal for the tire inflation pressure to be higher after driving as
heat is generated in the tire. Do not reduce tire inflation pressure after
driving.

●

Never exceed the vehicle capacity weight.
Passengers and luggage weight should be placed so that the vehicle
is balanced.

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CAUTION

■

Proper inflation is critical to save tire performance

Keep your tires properly inflated.
If the tires are not properly inflated, the following conditions may occur
which could lead to an accident resulting in death or serious injury:

●

Excessive wear

●

Uneven wear

●

Poor handling

●

Possibility of blowouts resulting from overheated tires

●

Air leaking from between tire and wheel

●

Wheel deformation and/or tire damage

●

Greater possibility of tire damage while driving (due to road hazards,
expansion joints, sharp edges in the road, etc.)

NOTICE

■

When inspecting and adjusting tire inflation pressure

Be sure to put the tire valve caps back on.
If a valve cap is not installed, dirt or moisture may get into the valve and
cause an air leak, resulting in decreased tire inflation pressure.

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Wheels

If a wheel is bent, cracked or heavily corroded, it should be

replaced.

Otherwise, the tire may separate from the wheel or cause a loss

of handling control.

■

Wheel selection

When replacing wheels, care should be taken to ensure that
they are equivalent to those removed in load capacity, diameter,
rim width, and inset

*

.

Replacement wheels are available at your Scion dealer.

*

: Conventionally referred to as “offset”.

Scion does not recommend using the following:

● Wheels of different sizes or types
● Used wheels
● Bent wheels that have been straightened

■

Aluminum wheel precautions
● Use only Scion wheel nuts and wrenches designed for use

with your aluminum wheels.

● When rotating, repairing or changing your tires, check that the

wheel nuts are still tight after driving 1000 miles (1600 km).

● Be careful not to damage the aluminum wheels when using

tire chains.

● Use only Scion genuine balance weights or equivalent and

use a plastic or rubber hammer when balancing your wheels.

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When replacing wheels (U.S.A. only)

The wheels of your vehicle are equipped with tire pressure warning
valves and transmitters that allow the tire pressure warning system to
provide advance warning in the event of a loss in tire inflation pressure.
Whenever wheels are replaced, tire pressure warning valves and trans-
mitters must be installed. (

P. 315)

CAUTION

■

When replacing wheels

●

Do not use wheels that are a different size from those recommended in
the Owner’s Manual, as this may result in a loss of handling control.

●

Never use an inner tube in a leaking wheel which is designed for a
tubeless tire. Doing so may result in an accident, causing death or seri-
ous injury.

■

When installing the wheel nuts

●

Never use oil or grease on the wheel bolts or wheel nuts. 
Oil and grease may cause the wheel nuts to be excessively tightened,
leading to bolt or disc wheel damage. In addition, the oil or grease can
cause the wheel nuts to loosen and the wheel may fall off, causing an
accident and resulting in death or serious injury. Remove any oil or
grease from the wheel bolts or wheel nuts.

●

Be sure to install the wheel nuts with
the tapered ends facing inward.
Installing the nuts with the tapered
ends facing outward can cause the
wheel to break and eventually cause
the wheel to come off while driving,
which could lead to an accident
resulting in death or serious injury.

Tapered 
portion

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CAUTION

■

Use of defective wheels prohibited

Do not use cracked or deformed wheels. 
Doing so could cause the tire to leak air during driving, possibly causing
an accident.

NOTICE

■

Replacing tire pressure warning valves and transmitters (U.S.A.
only)

●

Because tire repair or replacement may affect the tire pressure warn-
ing valves and transmitters, make sure to have tires serviced by your
Scion dealer or other qualified service shop. In addition, make sure to
purchase your tire pressure warning valves and transmitters at your
Scion dealer.

●

Ensure that only genuine Scion wheels are used on your vehicle.
Tire pressure warning valves and transmitters may not work properly
with non-genuine wheels. 

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Air conditioning filter

The air conditioning filter must be changed regularly to maintain air

conditioning efficiency.

■

Removal method

Vehicles without a smart key system: 
Turn the engine switch to the “LOCK” position.

Vehicles with a smart key system: 
Turn the “ENGINE START STOP” switch off.

Open the glove box. (

P. 254)

Push in each side of the glove
box to disconnect the claws.

Remove the cover.

Remove the filter cover.

STEP 

1 

STEP 

2 

STEP 

3 

STEP 

4 

STEP 

5 

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Remove the filter.

■

Replacement method

Replace the air conditioning
filter with a new one.

The 

“

UP” marks shown on

the filter should be pointing up.

STEP 

6 

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Changing interval

Inspect and replace the air conditioning filter according to the maintenance
schedule. In dusty areas or areas with heavy traffic flow, early replacement
may be required. (For scheduled maintenance information, please refer to
the “Scheduled Maintenance Guide” or “Owner’s Manual Supplement”.)

■

If air flow from the vents decreases dramatically

The filter may be clogged. Check the filter and replace if necessary.

NOTICE

■

When using the air conditioning system

Make sure that a filter is always installed.
Using the air conditioning system without a filter may cause damage to the
system.

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Wireless remote control/electronic key battery

Replace the battery with a new one if it is depleted.

■

You will need the following items:
● Flathead screwdriver 
● Small flathead screwdriver
● Lithium battery

Vehicles without a smart key system (type A): CR2016
Vehicles without a smart key system (type B): CR1620
Vehicles with a smart key system: CR1632

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Replacing the battery (vehicles without a smart key system)

Type A

Remove the cover.

To prevent damage to the key,
cover the tip of the screwdriver
with a rag.

Remove the module.

Remove the battery cover and
the depleted battery.

Insert a new battery with the
“+” terminal facing up.

STEP 

1 

STEP 

2 

STEP 

3 

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Type B

Remove the cover.

To prevent damage to the key,
cover the tip of the screwdriver
with a rag.

Remove the battery cover.

Remove the depleted battery.

Insert a new battery with the
“+” terminal facing up.

STEP 

1 

STEP 

2 

STEP 

3 

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Replacing the battery (vehicles with a smart key system)

Take out the mechanical key.

Remove the cover.

To prevent damage to the key,
cover the tip of the screwdriver
with a rag.

Remove the depleted battery.

Insert a new battery with the
“+” terminal facing up.

STEP 

1 

STEP 

2 

STEP 

3