check engine MAZDA MODEL 3 HATCHBACK 2021 Owners Manual

Keyless Entry System
▼Keyless Entry System
This system uses the key buttons to
remotely lock and unlock the doors,
liftgate, and fuel-
filler lid, and opens
the trunk lid.
The system can start the engine
without having to take the key out of
your purse or pocket.
It can also help you signal for attention
or help.
Operating the theft-deterrent system is
also possible on theft-deterrent
system-equipped vehicles.

System malfunctions or warnings are
indicated by the following warning
lights or beeps.
Check the displayed message for more
information and, if necessary, have the
vehicle inspected at an Authorized
Mazda Dealer, according to the
indication.
KEY Warning Indication/Warning
Light (Red)
Refer to KEY Warning Indication/
Warning Light (Red) on page 7-33.
Ignition Not Switched O ff (STOP)
Warning Beep
Refer to Ignition Not Switched Off
(STOP) Warning Beep on page
7-43.
Key Removed from Vehicle Warning
Beep
Refer to Key Removed from Vehicle
Warning Beep on page 7-43.
If you have a problem with the key,
consult an Authorized Mazda Dealer.

If your key is lost or stolen, consult an
Authorized Mazda Dealer as soon as
possible for a replacement and to
make the lost or stolen key inoperative.
CAUTION
Radio equipment like this is governed
by laws in the United States.
Changes or modi fications not expressly
approved by the party responsible for
compliance could void the user's
authority to operate the equipment.
NOTE
The keyless entry system operation
may vary due to local conditions.
The keyless entry system is fully
operational when the ignition is
switched off . The system does not
operate if the ignition is switched to
any position other than o ff.
If the key does not operate when
pressing a button or the operational
range becomes too small, the battery
may be weak. To install a new
battery, refer to Key Battery
Replacement (page 6-31).
Battery life is about 1 year. Replace
the battery with a new one if the
messages are displayed in the
instrument cluster. Replacing the
battery about once a year is
recommended because the KEY
warning indication may not display
depending on the rate of battery
depletion.
Additional keys can be obtained at
an Authorized Mazda Dealer. Up to
6 keys can be used with the keyless
functions per vehicle. Bring all keys
to an Authorized Mazda Dealer
when additional keys are required.
Before Driving
Keys
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▼Emission Control System
This vehicle is equipped with an
emission control system (the catalytic
converter is part of this system) that
enables the vehicle to comply with
existing exhaust emissions
requirements.
WARNING
Never park over or near anything
fl
ammable:
Parking over or near anything
fl ammable, such as dry grass, is
dangerous. Even with the engine
turned o ff, the exhaust system remains
very hot after normal use and could
ignite anything flammable. A resulting
fire could cause serious injury or death.
CAUTION
Ignoring the following precautions
could cause lead to accumulate on the
catalyst inside the converter or cause
the converter to get very hot. Either
condition will damage the converter
and cause poor performance.
 USE ONLY UNLEADED FUEL.
 Do not drive your Mazda with any
sign of engine malfunction.
 Do not coast with the ignition
switched o ff.
 Do not descend steep grades in gear
with the ignition switched o ff.
 Do not operate the engine at high
idle for more than 2 minutes.
 Do not tamper with the emission
control system. All inspections and
adjustments must be made by a
quali fied technician.
 Do not push-start or pull-start this
vehicle.
NOTE
Under U.S. federal law, any
modi fication to the
original-equipment emission control
system before the first sale and
registration of a vehicle is subject to
penalties. In some states, such modi fication made on a used vehicle
is also subject to penalties.
While the engine is o ff, the sound of
a valve opening and closing can be
heard at the rear of the vehicle,
however this does not indicate an
abnormality. The vehicle has a
self-checking device and it operates
while the engine is o ff.
▼ Engine Exhaust (Carbon
monoxide)
WARNING
Do not drive your vehicle if you smell
exhaust gas inside the vehicle:
Engine exhaust gas is dangerous. This
gas contains carbon monoxide (CO),
which is colorless, odorless, and
poisonous. When inhaled, it can cause
loss of consciousness and death. If you
smell exhaust gas inside the vehicle,
keep all windows fully open and
contact an Authorized Mazda Dealer
immediately.
Before Driving
Fuel and Emission
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CAUTION
Always use only a genuine Mazda
fuel- filler cap or an approved
equivalent, available at an
Authorized Mazda Dealer. The
wrong cap can result in a serious
malfunction of the fuel and emission
control systems.
(U.S.A. and Canada)
It may also cause the check engine
light in the instrument cluster to
illuminate.
 When using an automatic car wash
or a high water pressure car washer,
lock the driver's door. Otherwise,
the fuel- filler lid may open
unexpectedly and could be
damaged.
▼ Refueling
Before refueling, close all the doors,
windows, and liftgate/trunk lid, and
switch the ignition OFF.
1. Using the following , unlock the
driver’s door.
Transmitter (page 3-16)Touch sensor (page 3-13)Door-lock switch (page 3-16)Auto lock/unlock function (page
3-17)
NOTE
When unlocking the driver's
door, the fuel lid is also unlocked
at the same time.
When locking the driver's door,
the fuel lid is locked after 90
seconds.
The time until the fuel lid is
locked after locking the driver's
door can be changed.
Refer to the Settings section in
the Mazda Connect Owner's
Manual.
However, when the driver's door
is locked using the following
functions, the fuel lid is also
locked at the same time.
Auto lock/unlock function
(page 3-17)
Auto re-lock function (page
3-5) and (page 3-13)
2. Press the location shown in the illustration and open the fuel lid.

3. To remove the fuel- filler cap, turn it
counterclockwise.
4. Attach the removed cap to the inner side of the fuel-filler lid.

4–door
1. Fuel- filler lid
2. Fuel- filler cap

Before Driving
Fuel and Emission
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5–door
1.Fuel- filler lid
2. Fuel- filler cap

5. Insert the refueling nozzle all the way and begin refueling. Pull out
the refueling nozzle after the
refueling stops automatically.
6. To close the fuel-filler cap, turn it
clockwise until a click is heard.
7. To close, press the fuel- filler lid
until a click sound is heard.

4–door
5–door
8. Make sure to lock all the doors when leaving the vehicle.
NOTE
Lock the doors after closing the
fuel- filler lid.
If the fuel- filler lid is closed after
locking the doors, the fuel- filler lid
cannot be locked.
CAUTION
(U.S.A. and Canada)
If the check fuel cap warning light
illuminates, the fuel- filler cap may not
be properly installed. If the warning
light illuminates, park your vehicle
safely o ff the right-of-way, remove the
fuel- filler cap and reinstall it correctly.
After the cap has been correctly
installed, the fuel cap warning light
may continue to illuminate until a
number of driving cycles have been
completed. A drive cycle consists of
starting the engine (after four or more
hours with the engine o ff) and driving
the vehicle on city and highway roads.
Continuing to drive with the check fuel
cap warning light illuminated could
cause the check engine light to
illuminate as well.
Before Driving
Fuel and Emission
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NOTE
The keys carry a unique electronic
code. For this reason, and to assure
your safety, obtaining a replacement
key requires some waiting time. They
are only available through an
Authorized Mazda Dealer.
Always keep a spare key in case one
is lost. If a key is lost, consult an
Authorized Mazda Dealer as soon as
possible.
If you lose a key, an Authorized
Mazda Dealer will reset the
electronic codes of your remaining
keys and immobilizer system. Bring
all the remaining keys to an
Authorized Mazda Dealer to reset.
Starting the vehicle with a key that
has not been reset is not possible.
▼Operation
NOTE
The engine may not start and security
indicator light may illuminate or
flash
if the key is placed in an area where
it is di fficult for the system to detect
the signal, such as on the dashboard
or in the glove compartment. Move
the key to a location within the signal
range, switch the ignition off, and
then restart the engine.
Signals from a TV or radio station, or
from a transceiver or mobile
telephone could interfere with your
immobilizer system. If you are using
the proper key and the engine fails to
start, check the security indicator
light.
Arming
The system is armed when the ignition
is switched from ON to o ff.
The security indicator light in the
instrument cluster flashes every 2
seconds until the system is disarmed.

Disarming
The system is disarmed when the
ignition is switched ON with the
correct programmed key. The security
indicator light illu minates for about 3
seconds and then turns o ff.
If the engine does not start with the
correct key, and the security indicator
light remains illuminated or flashing ,
try the following:
Make sure the key is within the
operational range for signal
transmission. Switch the ignition o ff,
and then restart the engine. If the
engine does not start after 3 or more
tries, contact an Authorized Mazda
Dealer.
Before Driving
Security System
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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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NOTE
The engine cannot be started
unless the clutch pedal is fully
depressed (manual transmission)
or the brake pedal is fully
depressed (automatic
transmission).
If there is a malfunction with the
push button start function, the
push button start indicator light
(amber) flashes. In this case, the
engine may start, however, have
the vehicle checked at an
Authorized Mazda Dealer as
soon as possible.
If the push button start indicator
light (green) does not illuminate,
perform the operation from the
beginning again. If it does not
illuminate, have the vehicle
checked at an Authorized Mazda
Dealer.
To switch the ignition position
without starting the engine,
perform the following operations
after the push button start
indicator light (green) turns on.
1. Release the clutch pedal (manual transmission) or
brake pedal (automatic
transmission).
2. Press the push button start to switch the ignition position.
The ignition switches in the
order of ACC, ON, and off
each time the push button
start is pressed. To switch the
ignition position again,
perform the operation from
the beginning.
▼ Emergency Operation for Starting
the Engine
If the KEY warning indication (red) is
displayed, or the push button start
indicator light (amber)
flashes, this
could indicate that the engine may not
start using the usual starting method.
Have your vehicle inspected at an
Authorized Mazda Dealer as soon as
possible. If this occurs, the engine can
be force-started. Press and hold the
push button start until the engine
starts. Other procedures necessary for
starting the engine such as having the
key in the cabin, and depressing the
clutch pedal (manual transmission) or
the brake pedal (automatic
transmission) are required.
When Driving
Start/Stop Engine
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▼Warning Indication/Warning Lights
These lights turn on or
flash to notify the user of the system operation status or a
system malfunction.
Signal Warning Refer to
Brake System Warning Indication/Warning Light*17-27
ABS Warning Indication/Warning Light*1
Electronic
Brake Force
Distribution
System Warn- ing
7-28
ABS warning 7-30
Charging System Warning Indication/Warning Light*17-28
Engine Oil Warning Indication/Warning Light*17-28
High Engine Coolant Temperature Warning Indication 7-29
Power Steering Malfunction Indication/Indicator Light*17-29
Master Warning Indication7-30
Brake Control System Warning Indication/Warning Light*17-30
Brake Override Warning Indication7-31
Check Engine Indication/Light*17-31
*Automatic Transmission Warning Indication/Warning Light*17-31
*AWD Warning Indication/Warning Light*17-31
When Driving
Instrument Cluster and Display
*Some models.4-23
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SignalWarning Refer to
Air Bag/Front Seat Belt Pretensioner System Warning Indication/
Warning Light*17-32
Tire Pressure Monitoring System (TPMS) Warning Indication/Warning
Light*1
Flashing
7-33
Tu r n s o n 7-37
(Red) KEY Warning Indication/Warning Light
*17-33
(Amber)
*High Beam Control System (HBC) Warning Indication/Warning
Light*17-34
i-ACTIVSENSE Warning Indication/Warning Light*17-34
Exterior Light Warning Indication/Warning Light*17-34
Low Fuel Warning Indication/Warning Light 7-35
Check Fuel Cap Warning Indication/Warning Light*17-35
Engine Oil Level Warning Indication/Warning Light*17-35
Seat Belt Warning Indication/Warning Light (Front seat) 7-36
(Red)Seat Belt Warning Light (Rear seat)
7-36
*Low Washer Fluid Level Warning Indication/Warning Light7-36
Door-Ajar Warning Indication
7-37
*Trunk lid-Ajar Warning Indication7-37
When Driving
Instrument Cluster and Display
4-24*Some models.
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SignalWarning Refer to
*Liftgate-Ajar Warning Indication 7-37
Door-Ajar Warning Light
7-37
*1 The light turns on when the ignition is switched on for an operation check, and turns off a few
seconds later or when the engine is started. If the light does not turn on or remains turned on, have
the vehicle inspected at an Authorized Mazda Dealer.
▼ Indication/Indicator Lights
These lights turn on or
flash to notify the user of the system operation status or a
system malfunction.
Signal Indicator Refer to
(Green)Seat Belt Indicator Light (Rear seat)
2-27
*Front Passenger Air Bag Deactivation Indicator Light2-71
Security Indicator LightImmobilizer
System3-41
Theft-Deterrent System
3-42
Malfunction 7-34
(Green) KEY Indicator Light
4-5
Wrench Indication/Indicator Light*14-29
*Shift Position Indication4-38
Lights-On Indicator Light
4-46
When Driving
Instrument Cluster and Display
*Some models.4-25
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