2021 MAZDA MODEL 6 battery replacement

Keyless Entry System
This system uses the key buttons to
remotely lock and unlock the doors, 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.
For vehicles with t he type A/type B
instrument cluster, check the displayed
message for more i nformation and, if
necessary, have the vehicle inspected at an
Authorized Mazda Dealer, according to
the indication.
KEY Warning Light (Red)
Refer to Contact Authorized Mazda
Dealer and Have Vehicle Inspected on
page 7-28.
Refer to Taking Action on page 7-35.
Ignition Not Switched Off (STOP)
Warning Beep
Refer to Ignition Not Switched Off
(STOP) Warning Beep on page 7-46.
Key Removed from Vehicle Warning
Beep
Refer to Key Removed from Vehicle
Warning Beep on page 7-46.
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 (door lock/unlock) 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
6-41).
Before Driving
Keys
3-4
Mazda6_8JN3-EA-20H_Edition1_old 2020-6-18 17:31:27

Operational Range
The system operates only when the driver
is in the vehicle or within operational
range while the key is being carried.
NOTE
When the battery power is low, or in
places where there are high-intensity radio
waves or noise, the operational range may
become narrower or the system may not
operate. For determining battery
replacement, Refer to Keyless Entry
System on page 3-4.
▼ Locking, Unlocking the Doors
Exterior antenna
Operational range80cm (31in)
80cm (31in)
NOTE
The system may not operate if you are
too close to the windows or door
handles.
If the key is left in the following areas
and you leave the vehicle, the doors may
be locked depending on the radio wave
conditions even if the key is left in the
vehicle.
Around the dashboard
In the storage compartments such as
the glove compartment or the center
console
On the rear parcel shelf
Next to a communication device such
as a mobile phone
▼
Opening the Trunk Lid
Exterior antenna
Operational range 80cm (31in)
Before Driving
Advanced Keyless Entry System
3-11
Mazda6_8JN3-EA-20H_Edition1_old
2020-6-18 17:31:27

Turning the Engine Off
WARNING
Do not stop the engine while the vehicle is
moving:
Stopping the engine while the vehicle is
moving for any reason other than in an
emergency is dangerous. Stopping the
engine while the vehicle is moving will
result in reduced braking ability due to the
loss of power braking, which could cause
an accident and serious injury.
1. Stop the vehicle completely.
2. Shift the selector lever to the Pposition and set the parking brake.
3. Press the push button start to turn off the engine. The ignition position is off.
CAUTION
When leaving the vehicle, make sure the
push button start is
off.
 (SKYACTIV-D 2.2)
If the engine is started and stopped
repeatedly before it warms up, the
engine may speed up while the vehicle is
stopped to clean the engine internally.
Do not stop the engine until the engine
returns to running at its normal speed.
NOTE
(SKYACTIV-G 2.5)
The cooling fan in the engine
compartment could turn on for a few
minutes after the ignition is switched
from ON to OFF, whether or not the A/C
is on or off, to cool the engine
compartment quickly.
If the system detects that the remaining
battery power of the key is low when the
ignition is switched from ON to ACC or
OFF, the following is indicated.
Replace with a new battery before the
key becomes unusable.
Refer to Key Battery Replacement on
page 6-41.
(Vehicle equipped with Type A/B
instrument cluster)
A message is indicated in the display of
the instrument cluster.
(Vehicle equipped with Type C
instrument cluster)
The KEY indicator li ght (green) flashes
for approximately 30 seconds.
Refer to Taking Action on page 7-35.
If the engine is turned off while the
selector lever is in a position other than
P, the ignition switches to ACC.
▼Emergency Engine Stop
Continuously pressing the push button
start or quickly pressing it any number of
times while the engi
ne is running or the
vehicle is being driven will turn the engine
off immediately. The ignition switches to
ACC.
When Driving
Start/Stop Engine
4-11
Mazda6_8JN3-EA-20H_Edition1_old 2020-6-18 17:31:27

Cylinder Deactivation*
The cylinder deactivation is a function
designed to reduce fuel consumption and
improve fuel economy by deactivating 2
out of the 4 cylinders while driving. The
function constantly determines which is
better for driving; 4 cylinders or 2
cylinders, regardless of the driver's
operations, and it performs the switching
automatically.
When the cylinder deactivation function
does not operate
The cylinder deactivation function does
not operate under the following
conditions.
The selector lever is in the P, N, or R
position, or 1st gear.
The engine oil temperature or engine
coolant temperature is low.
After disconnecting the battery
terminals for some reason, such as for
battery replacement.
When Driving
Start/Stop Engine
4-12*Some models.
Mazda6_8JN3-EA-20H_Edition1_old 2020-6-18 17:31:27

Do not remove, disassemble, or mo dify the radar sensor (front).
 For repairs, replacement or paint work ar ound the radar sensor (front), consult an
Authorized Mazda Dealer.
 Do not modify the suspension. If the suspensi on are modified, the vehicle's posture could
change and the radar sensor (front) may not be able to correctly detect a vehicle ahead or
an obstruction.
NOTE
Under the following conditions, the radar sensor (front) 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 effectively, 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 reflecting 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 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 radar sensor (front) 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.
Roads with repeated up and down slopes
Driving on poor roads or unpaved roads.
The distance between your vehicle and the vehicle ahead is extremely short.
A vehicle suddenly comes close such as by cutting into the lane.
To prevent incorrect operation of the system, use tires of the same specified size,
manufacturer, brand, and tread pattern on all four wheels. In addition, do not use tires
with significantly different wear patterns or tire pressures on the same vehicle (Including
the temporary spare tire).
If the battery power is weak, the system may not operate correctly.
When driving on roads with little traffic and few vehicles ahead or obstructions for the
radar sensor (front) to detect, “Front Radar Sensor Blocked” may be temporarily
displayed, however, this does not indicate a problem.
When Driving
i-ACTIVSENSE
4-221
Mazda6_8JN3-EA-20H_Edition1_old 2020-6-18 17:31:27

6Maintenance and Care
How to keep your Mazda in top condition.
Essential Information........................6-2 Introduction.................................. 6-2
Scheduled Maintenance.................... 6-4 Scheduled Maintenance (U.S.A.,
Canada, and Puerto Rico)............. 6-4
Scheduled Maintenance
(Mexico)..................................... 6-11
Owner Maintenance........................ 6-16 Owner Maintenance
Precautions................................. 6-16
Hood........................................... 6-18
Engine Compartment
Overview.................................... 6-20
Engine Oil...................................6-22
Engine Coolant........................... 6-26
Brake Fluid............ ..................... 6-28
Washer Fluid............................... 6-29
Diesel Exhaust Fluid (DEF)
(SKYACTIV-D 2.2).................... 6-30
Body Lubrication...... .................. 6-34
Wiper Blades.............................. 6-35
Battery........................................ 6-39
Key Battery Replacement........... 6-41
Tires............................................ 6-44
Light Bulbs................................. 6-48
Fuses........................................... 6-52
Appearance Care............................. 6-59 Exterior Care.............................. 6-59
Interior Care................................6-65
6-1
Mazda6_8JN3-EA-20H_Edition1_old 2020-6-18 17:31:27

▼Battery Maintenance
To get the best service from a battery:
Keep it securely mounted.
Keep the top clean and dry.
Keep terminals and connections clean,
tight, and coated with
petroleum jelly or
terminal grease.
Rinse off spilled electrolyte immediately
with a solution of water and baking
soda.
If the vehicle will not be used for an
extended time, disconnect the battery
cables and charge the battery every 6
weeks.
▼ Battery Replacement
Contact an Authorized Mazda Dealer for
battery replacement.
Key Battery Replacement
If the buttons on the transmitter are
inoperable and the operation indicator
light does not flash, the battery may be
dead.
Replace with a new b
attery before the
transmitter becomes unusable.
CAUTION
 Make sure the battery is installed
correctly. Battery leakage could occur if it
is not installed correctly.
 When replacing the battery, be careful
not to touch any of the internal circuitry
and electrical terminals, bend the
electrical terminals, or get dirt in the
transmitter as the transmitter could be
damaged.
 There is the danger of explosion if the
battery is not correctly replaced.
 Dispose of used batteries according to
the following instructions.
 Insulate the plus and minus terminals
of the battery using cellophane or
equivalent tape.
 Never disassemble.
 Never throw the battery into
fire or
water.
 Never deform or crush.
 Replace only with the same type battery
(CR2032 or equivalent).
Maintenance and Care
Owner Maintenance
6-41
Mazda6_8JN3-EA-20H_Edition1_old 2020-6-18 17:31:27

Specifications
▼Engine
Gasoline engine
Item Specification
SKYACTIV-G 2.5 SKYACTIV-G 2.5T
Type DOHC-16V in-line, 4-cylinder
Bore × Stroke 89.0 × 100 mm (3.50 × 3.94 in)
Displacement 2,488.5 ml (2,488.5 cc)
Compression ratio 13.010.5
Diesel engine
Item Specification
SKYACTIV-D 2.2
Type DOHC-16V in-line, 4-cylinder
Bore × Stroke 86.0 × 94.3 mm (3.39 × 3.71 in)
Displacement 2,191.1 ml (2,191.1 cc)
Compression ratio 14.4
▼Electrical System
Battery*1
Classification
Specification
SKYACTIV-G 2.5,
SKYACTIV-G 2.5T 12V-60Ah/20HR or 12V-65Ah/20HR
SKYACTIV-D 2.2 12V-65Ah/20HR or 12V-80Ah/20HR
Spark-plug
Classification Specification
SKYACTIV-G 2.5 Mazda Genuine spark plug
*2PE5R-18-110 or PE5S-18-110
SKYACTIV-G 2.5T PY8V-18-110
*1 Check the battery installed on the vehicle and use a battery with an equal or higher performance. However, the
performance of the battery may vary even among the same battery types, consult an Authorized Mazda Dealer
for replacement.
*2 The spark plugs provide the SKY ACTIV-G its optimum performance. Consult an Authorized Mazda Dealer
for details.
Specifications
Specifications
9-4
Mazda6_8JN3-EA-20H_Edition1_old 2020-6-18 17:31:27