radiator MAZDA MODEL 3 SEDAN 2021 Owners Manual

Winter Driving
▼Winter Driving
Carry emergency gear, including tire
chains, window scraper,
flares, a small
shovel, jumper cables, and a small bag
of sand or salt.
Ask an Authorized Mazda Dealer to
check the following:
Have the proper ratio of antifreeze in
the radiator.
Refer to Engine Coolant on page
6-20.
Inspect the battery and its cables.
Cold reduces battery capacity.
Use an engine oil appropriate for the
lowest ambient temperatures that
the vehicle will be driven in (page
6-17).
Inspect the ignition system for
damage and loose connections.
Use washer fluid made with
antifreeze ―but do not use engine
coolant antifreeze for washer fluid
(page 6-22).
NOTE
Remove snow before driving. Snow
left on the windshield is dangerous
as it could obstruct vision.
Do not apply excessive force to a
window scraper when removing ice
or frozen snow on the mirror glass
and windshield.
Never use warm or hot water for
removing snow or ice from windows
and mirrors as it could result in the
glass cracking.
Drive slowly. Braking performance
can be adversely a ffected if snow or
ice adheres to the brake
components. If this situation occurs,
drive the vehicle slowly, releasing the
accelerator pedal and lightly applying
the brakes several times until the
brake performance returns to
normal.
▼ Snow Tires
Use snow tires on all 4 wheels
Do not go faster than 120 km/h (75
mph) while driving with snow tires.
In
flate snow tires 30 kPa (0.3 kgf/cm
2,
4.3 psi) more than recommended on
the tire pressure label (driver's door
frame), but never more than the
maximum cold-tire pressure shown on
the tires.

Mexico
The vehicle is originally equipped with
summer tires designed for optimum
traction on wet and dry roads. If your
vehicle is to be used on snow and ice
covered roads, Mazda recommends
that you replace the tires originally
equipped on your vehicle with snow
tires during the winter months.
Except Mexico
The vehicle is originally equipped with
all season radials designed to be used
all year around. In some extreme
climates you may find it necessary to
replace them with snow tires during
the winter months to further improve
traction on snow and ice covered
roads.
Before Driving
Driving Tips
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Windshield Wipers andWasher
▼Windshield Wipers and Washer
The ignition must be switched ON to
use the wipers.
WARNING
Use only windshield washer
fluid or
plain water in the reservoir:
Using radiator antifreeze as washer
fl uid is dangerous. If sprayed on the
windshield, it will dirty the windshield,
a ff ect your visibility, and could result in
an accident.
Only use windshield washer fluid
mixed with anti-freeze protection in
freezing weather conditions:
Using windshield washer fluid without
anti-freeze protection in freezing
weather conditions is dangerous as it
could freeze on the windshield and
block your vision which could cause an
accident. In addition, make sure the
windshield is su fficiently warmed using
the defroster before spraying the
washer fluid.
CAUTION
 When the wipers are not used during
freezing temperatures or for a long
time, the wiper rubber may adhere
to the glass. If the wipers are
operated while adhered to the glass,
it could damage the wiper rubber
and motor.
 If the wipers are operated while the
glass is dry, the glass could be
scratched and the wiper rubber
damaged. When the glass is dry,
spray washer
fluid before operating
the wipers.
 If the amount of washer fluid spray is
insu fficient, do not use the washer
switch. If the washer switch
continues to be operated with no
washer fluid being sprayed, it could
lead to pump damage.
NOTE
If the windshield wipers are operated
under cold weather conditions or
during snowfall, they could stop due to
accumulated snow on the windshield.
If the windshield wipers stop due to
accumulated snow on the windshield,
park the vehicle in a safe place, turn
the wiper switch o ff, and then remove
the accumulated snow. If the wiper
switch is turned to another position
other than OFF, the wipers will
operate. If the wipers do not operate
even though the wiper switch is turned
to a position other than OFF, consult
an Authorized Mazda Dealer as soon
as possible.
▼ Windshield Wipers
Turn the wipers on by pressing the
lever up or down.
With intermittent wiper

When Driving
Switches and Controls
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▼Pre-Crash Safety Technology
Pre-crash safety technology is designed
to assist the driver in averting collisions
or reducing their severity in situations
where they cannot be avoided.
Collision damage reduction
Forward driving
Smart Brake Support (SBS) ..................
........................................ page 4-158
Reverse driving
Smart Brake Support [Rear]
(SBS
-R).............................page 4-160
Smart Brake Support [Rear Crossing] (S
BS -RC)............................. page 4-164
▼ Camera and Sensors
Forward Sensing Camera (FSC)
The Forward Sensing Camera (FSC)
detects lane indications and recognizes
headlights, taillights and city lights
during nighttime driving. In addition, it
also detects the vehicle ahead,
pedestrians, or obstructions. The
following systems use the Forward
Sensing Camera (FSC).
High Beam Control system (HBC)Lane Departure Warning System
(LDWS)
Tra
ffic Sign Recognition System (TSR)Distance & Speed Alert (DSA)Driver Attention Alert (DAA)Mazda Radar Cruise Control
(MRCC)
Mazda Radar Cruise Control with
Stop & Go function (MRCC with
Stop & Go function)
Lane-keep Assist System (LAS)Tra
ffic Jam Assist (TJA)Smart Brake Support (SBS)
The Forward Sensing Camera (FSC) is
installed at the top of the windshield
near the rearview mirror.
Refer to Forward Sensing Camera
(FSC) on page 4-203.
Front radar sensor
The front radar sensor detects radio
waves re flected o ff a vehicle ahead
sent from the radar sensor. The
following systems use the front radar
sensor.
Distance & Speed Alert (DSA)Mazda Radar Cruise Control
(MRCC)
Mazda Radar Cruise Control with
Stop & Go function (MRCC with
Stop & Go function)
Tra ffic Jam Assist (TJA)Smart Brake Support (SBS)
The front radar sensor is mounted
behind the radiator grille.
Refer to Front Radar Sensor on page
4-207.
Front side radar sensor
The front side radar sensors detects
radio waves re flected off a vehicle
ahead sent from the radar sensor. The
following systems use the front side
radar sensor.
Front Cross Tra ffic Alert (FCTA)
The front side radar sensors are
installed inside the front bumper, one
on the left side and one on the right
side.
Refer to Front Side Radar Sensor on
page 4-209.
When Driving
i-ACTIVSENSE
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Changing the Set Vehicle Speed
(To accelerate/decelerate using the
RES switch)
When the RES switch is pressed up
(SET+), the vehicle accelerates and
when the RES switch is pressed down
(SET-), it decelerates.
Press and release immediately: 1
km/h (1 mph)
Press and hold: 10 km/h (5 mph)
(To increase speed using accelerator
pedal)
Depress the accelerator pedal and
press the RES switch up (SET+) or
down (SET -) at the desired speed. If
the switch is not operated, the system
returns to the set speed after you
release your foot from the accelerator
pedal.
NOTE
The warnings and brake control do
not operate while the accelerator
pedal is depressed.
Canceling the system
When the following operations are
performed, the MRCC system is
canceled, and the MRCC set indication
(green) switches to the MRCC standby
indication (white) at the same time.
The CANCEL switch is pressed.The brake pedal is depressed.The shift lever is in the reverse (R)
position.

Under the following conditions, the
MRCC cancel indication is displayed in
the multi-information display and a
single beep sound is heard.
The DSC has operated.
The Smart Brake Support (SBS) has
operated.
When traveling on a downslope for a
long period of time.
There is a problem with the system.The vehicle speed decreases to less
than 25 km (16 mph).
The shift lever is shifted to neutral
(N) for a certain period of time.
The clutch is depressed for a certain
period of time.
The engine stalls.The front radar sensor cannot detect
target objects (during rain, fog , snow
or other inclement weather
conditions, or when the radiator
grille is dirty).
The parking brake is applied.Any of the doors is opened.The driver's seat belt is unfastened.The operation frequency of the
braking by the MRCC control is high.
Resuming control
If the MRCC system is canceled, you
can resume control at the previously
set speed by pressing the RES switch
and after all of the operation
conditions have been met.
NOTE
If the set speed is not indicated in the
display, the control does not resume
even if the RES switch is pressed.
Tu r n i n g off the system
When the MRCC switch is pressed
while the MRCC is operating, the
MRCC turns off
.
When Driving
i-ACTIVSENSE
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Changing the Set Vehicle Speed
(To accelerate/decelerate using the
RES switch)
When the RES switch is pressed up
(SET+), the vehicle accelerates and
when the RES switch is pressed down
(SET-), it decelerates.
Press and release immediately: 1
km/h (1 mph)
Press and hold: 10 km/h (5 mph)
(To increase speed using accelerator
pedal)
Depress the accelerator pedal and
press the RES switch up (SET+) or
down (SET -) at the desired speed. If
the switch is not operated, the system
returns to the set speed after you
release your foot from the accelerator
pedal.
NOTE
The warnings and brake control do
not operate while the accelerator
pedal is depressed.
The setting speed can be changed by
operating the RES switch up (SET+)
or down (SET -) during stop hold
control.
Canceling the system
When the following operations are
performed, the MRCC with Stop & Go
function system is canceled, and the
MRCC with Stop & Go function set
indication (green) switches to the
MRCC with Stop & Go function
standby indication (white) at the same
time.
The CANCEL switch is pressed.The brake pedal is depressed.The selector lever is in the P (Park), N
(Neutral), or R (Reverse) position.

Under the following conditions, the
MRCC with Stop & Go function cancel
indication is displayed in the
multi-information display and a single
beep sound is heard.
The DSC has operated.The Smart Brake Support (SBS) has
operated.
When traveling on a downslope for a
long period of time.
There is a problem with the system.The parking brake is automatically
applied during stop hold control.
The front radar sensor cannot detect
target objects (during rain, fog , snow
or other inclement weather
conditions, or when the radiator
grille is dirty).
The parking brake is applied.Any of the doors is opened.The driver's seat belt is unfastened.The operation frequency of the
braking by the MRCC with Stop &
Go function control is high.
When Driving
i-ACTIVSENSE
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In the following cases, the TJA cancel indication is displayed and a sound is activated
one time.
The DSC has operated.The Smart Brake Support (SBS) has operated.The vehicle is driven on a downslope for a long time.There is a problem with the system.The front radar sensor cannot detect target objects (during rain, fog , snow or other
inclement weather conditions, or when the radiator grille is dirty).
The parking brake is applied.Any of the doors is opened.The driver's seat belt is unfastened.The operation frequency of the braking by the TJA control is high.(Automatic transmission vehicle)
The parking brake is automatically applied during stop hold control.
(Manual transmission vehicle)
The vehicle speed decreases below 25 km/h (15 mph).The shift lever is in the neutral posi tion for a certain period of time.The clutch pedal is depressed for a certain period of time.The engine has stalled.

Steering assist function
If any of the following conditions occurs, the steering assist function is temporarily
canceled.
The headway control function is canceled.White (yellow) lane lines cannot be detected or a vehicle ahead cannot be
recognized.
Your vehicle speed is more than about 64 km/h (40 mph).The accelerator pedal is operated.The turn signal lever is operated.The vehicle is being driven on a sharp curve.The width of a lane is excessively narrow or wide.The vehicle crosses a lane line.The driver takes his/her hands o ff the steering wheel.The steering wheel is operated abruptly.There is a problem with the system.The temperature in the Forward Sensing Camera (FSC) is too high or too low.The windshield around the Forward Sensing Camera (FSC) is foggy.The windshield around the Forward Sensing Camera (FSC) is blocked by an
obstruction, causing poor forward visibility.

When Driving
i-ACTIVSENSE
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Do not adhere stickers (including
transparent stickers) to the surface of
the radiator grille and front emblem
in and around the front radar sensor,
and do not replace the radiator grille
and front emblem with any product
that is not a genuine product
designed for use with the front radar
sensor.
 The front radar sensor includes a
function for detecting soiling of the
radar sensor's front surface and
informing the driver, however,
depending on the conditions, it may
require time to detect or it may not
detect plastic shopping bags, ice or
snow. If this occurs, the system may
not operate correctly, therefore
always keep the front radar sensor
clean.
 Do not install a grille guard.
 If the front part of the vehicle has
been damaged in a vehicle accident,
the position of the front radar sensor
may have moved. Stop the system
immediately and always have the
vehicle inspected at an Authorized
Mazda Dealer.
 Do not use the front bumper to push
other vehicles or obstructions such
as when pulling out of a parking
space. Otherwise, the front radar
sensor could be hit and its position
deviated.
 Do not remove, disassemble, or
modify the front radar sensor.
 For repairs, replacement or paint
work around the front radar sensor,
consult an Authorized Mazda Dealer.
 Do not modify the suspensions. If
the suspensions are modi fied, the
vehicle's posture could change and
the front radar sensor may not be
able to correctly detect a vehicle
ahead or an obstruction.NOTE
Under the following conditions, the
front radar sensor may not be able to
detect vehicles ahead or obstructions
correctly and each system may not
operate normally.
The rear surface of a vehicle ahead
does not reflect radio waves
e ff ectively, such as an unloaded
trailer or an automobile with a
loading platform covered by a soft
top, vehicles with a hard plastic
tailgate, and round-shaped
vehicles.
Vehicles ahead with low vehicle
height and thus less area for
re flecting radio waves.
Visibility is reduced due to a
vehicle ahead casting off
water,
snow, or sand from its tires and
onto your windshield.
The trunk/luggage compartment is
loaded with heavy objects or the
rear passenger seats are occupied.
Ice, snow, or soiling is on the front
surface of the front emblem.
During inclement weather such as
rain, snow, or sand storms.
When driving near facilities or
objects emitting strong radio
waves.
Under the following conditions, the
front radar sensor may not be able to
detect vehicles ahead or
obstructions.
The beginning and end of a curve.Roads with continuous curves.Narrow lane roads due to road
construction or lane closures.
The vehicle ahead enters the radar
sensor's blind spot.
The vehicle ahead is running
abnormally due to accident or
vehicle damage.
When Driving
i-ACTIVSENSE
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Engine Coolant
▼Inspecting Coolant Level
WARNING
Do not use a match or live
flame in
the engine compartment. DO NOT
ADD COOLANT WHEN THE ENGINE
IS HOT :
A hot engine is dangerous. If the
engine has been running, parts of the
engine compartment can become very
hot. You could be burned. Carefully
inspect the engine coolant in the
coolant reservoir, but do not open it.
Pull over to a safe location, then
switch the ignition o ff 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 inde finitely 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.
NOTE
Changing the coolant should be done
by an Authorized Mazda Dealer.
Inspect the antifreeze protection and
coolant level in the coolant reservoir at
least once a year ―at the beginning of
the winter season ―and before
traveling where temperatures may drop
below freezing.

Inspect the condition and connections
of all cooling system and heater hoses.
Replace any that are swollen or
deteriorated.

The coolant should be at full in the
radiator and between the FULL and
LOW marks on the coolant reservoir
when the engine is cool.
SKYACTIV -G 2.0 and SKYACTIV -G
2.5

Maintenance and Care
Owner Maintenance
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SKYACTIV-G 2.5T

FULL
LOW
If it is at or near LOW, add enough
coolant to the coolant reservoir to
provide freezing and corrosion
protection and to bring the level to
FULL.
Securely tighten the coolant reservoir
tank cap after adding coolant.
CAUTION
 Radiator coolant will damage paint.
Rinse it o ff quickly if spilled.
 If the “FL22” mark is shown on or
near the cooling system cap, use of
FL-22 is recommended when
replacing engine coolant. Using
engine coolant other than FL -22 may
cause serious damage to the engine
and cooling system.

If the coolant reservoir is empty or new
coolant is required frequently, consult
an Authorized Mazda Dealer.
Brake/Clutch Fluid
▼ Inspecting Brake/Clutch Fluid
Level
WARNING
If the brake/clutch
fluid level is low,
have the brakes inspected:
A low brake/clutch fluid level is
dangerous.
A low level could indicate brake lining
wear or a brake system leak which
could cause the brakes to fail and lead
to an accident.
The brakes and clutch draw fluid from
the same reservoir.
Inspect the fluid level in the reservoir
regularly. It should be kept between
the MAX and MIN lines.
The level normally drops with
accumulated distance, a condition
associated with wear of brake and
clutch linings. If it is excessively low,
have the brake/clutch system
inspected by an Authorized Mazda
Dealer.
Maintenance and Care
Owner Maintenance
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Washer Fluid
▼Inspecting Washer Fluid Level
WARNING
Use only windshield washer
fluid or
plain water in the reservoir:
Using radiator antifreeze as washer
fl uid is dangerous. If sprayed on the
windshield, it will dirty the windshield,
a ff ect your visibility, and could result in
an accident.
Using Washer Fluid Without
Anti-freeze Protection in Cold
Weather:
Operating your vehicle in temperatures
below 4 °C (40 °F) using washer fluid
without anti-freeze protection is
dangerous as it could cause impaired
windshield vision and result in an
accident. In cold weather, always use
washer fluid with anti-freeze
protection.
NOTE
State or local regulations may restrict
the use of volatile organic compounds
(VOCs), which are commonly used as
anti-freeze agents in washer fluid. A
washer fluid with limited VOC content
should be used only if it provides
adequate freeze resistance for all
regions and climates in which the
vehicle will be operated.
Inspect fluid level in the washer fluid
reservoir; add fluid if necessary.
The top of the float should be between
F and E.

Use plain water if washer fluid is
unavailable.
But use only washer fluid in cold
weather to prevent it from freezing.
NOTE
Front and rear washer fluid is supplied
from the same reservoir.
Maintenance and Care
Owner Maintenance
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