2020 MAZDA MODEL 3 HATCHBACK check engine

Keyless Entry System
▼Keyless Entry System
This system uses the key buttons to
remotely lock and unlock the doors,
liftgate, and fuel-fill
er 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 s ignal 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 fo llowing warning lights
or beeps.
Check the displaye d message for more
information and, if necessary, have the
vehicle inspected at an Authorized Mazda
Dealer, according to the indication.
KEY Warning Indicat ion/Warning Light
(Red)
Refer to KEY Warning Indication/
Warning Light (Red) on page 7-33.
Ignition Not Switched Off (STOP)
Warning Beep
Refer to Ignition Not Switched Off
(STOP) Warning Beep on page 7-42.
Key Removed from Vehicle Warning
Beep
Refer to Key Removed from Vehicle
Warning Beep on page 7-42.
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 modifications 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 off.
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
6-28).
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.
Before Driving
Keys
3-4
Mazda3_8HZ1-EA-19G_Edition1_old 2019-5-17 13:49:03

▼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.
WA R N I N G
Never park over or near anything
flammable:
Parking over or near anything flammable,
such as dry grass, is dangerous. Even with
the engine turned off, 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
off.
 Do not descend steep grades in gear with
the ignition switched off.
 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 qualified technician.
Do not push-start or pull-start this
vehicle.
NOTE
Under U.S. federal law, any
modification to the original-equipment
emission control system before the first
sale and registration of a vehicle is
subject to penalties. In some states, such
modification made on a used vehicle is
also subject to penalties.
While the engine is off, 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 off.
▼ Engine Exhaust (Carbon monoxide)
WA R N I N G
Do not drive your vehicle if you smell
exhaust gas inside the vehicle:
Engine exhaust gas is dangerous. This gas
contains carbon mono
xide (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
3-26
Mazda3_8HZ1-EA-19G_Edition1_old 2019-5-17 13:49:03

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 wash, 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 3-15)
Touch sensor (page 3-13)
Door-lock switch (page 3-15)
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,
3-13)
2. Press the locat ion 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 fu el-filler lid.

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

Before Driving
Fuel and Emission
3-28
Mazda3_8HZ1-EA-19G_Edition1_old 2019-5-17 13:49:03

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

5. Insert the refuelin g 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 whenleaving 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 off 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 off) 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
3-29
Mazda3_8HZ1-EA-19G_Edition1_old 2019-5-17 13:49:03

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
difficult 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 off.
The security indica
tor 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 illuminates for about 3 seconds and
then turns off.
If the engine does not start with the correct
key, and the security indicator light
remains illuminated o r flashing, try the
following:
Make sure the key is within the
operational range for signal transmission.
Switch the ignition off, 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
3-41
Mazda3_8HZ1-EA-19G_Edition1_old 2019-5-17 13:49:03

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 Maz da Dealer to check
the following:
Have the proper ratio of antifreeze in the
radiator.
Refer to Engine Coolant on page 6-17.
Inspect the ba ttery 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 6-15).
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
6-19).
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 affected 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. Inflate 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 origin ally 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 origina lly 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
3-47
Mazda3_8HZ1-EA-19G_Edition1_old 2019-5-17 13:49:03

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 igni tion 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 poss
ible. 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 transmi ssion) or the brake
pedal (automatic transmission) are
required.
When Driving
Start/Stop Engine
4-9
Mazda3_8HZ1-EA-19G_Edition1_old 2019-5-17 13:49:03

▼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 Distribu‐ tion SystemWa r n i n g 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 Indication 7-30
Brake Control System Warning Indication/Warning Light*17-30
Brake Override Warning Indication 7-31
Check Engine Indication/Light*17-31
*Automatic Transmission Warning Indication/Warning Light*17-31
*AWD Warning Indication/Warning Light*17-31
Air Bag/Front Seat Belt Pretensioner System Warning Indication/ Wa r n i n g
Light*17-32
When Driving
Instrument Cluster and Display
*Some models.4-23
Mazda3_8HZ1-EA-19G_Edition1_old 2019-5-17 13:49:03