ECU MAZDA MODEL 3 HATCHBACK 2018 (in English) Repair Manual

1. Remove the battery cover.
2. Make sure the booster battery is 12 Vand that its negative terminal is
grounded.
3. If the booster battery is in another vehicle, do not allow both vehicles to
touch. Turn off the engine of the
vehicle with the booster battery and all
unnecessary electrical loads in both
vehicles.
4. Connect the jumper cables in the exact
sequence as in the illustration.
Connect one end of a cable to the
positive terminal on the discharged
battery (1).
Attach the other e nd to the positive
terminal on the booster battery (2).
Connect one end of the other cable
to the negative terminal of the
booster battery (3).
Connect the other end to the ground
point indicated in the illustration
away from the discharged battery
(4).
5. Start the engine of the booster vehicle
and run it a few minutes. Then start the
engine of the other vehicle.
6. (With i-ELOOP system)
The i-ELOOP indicator light may flash
after the engine is started. The
indicator light turns off when the
engine is running and the charging is
completed. Make sure the i-ELOOP
indicator light is turns off before
driving.

NOTE
If the vehicle is driven with the
i-ELOOP indicator light flashing, a
beep sound is heard.
If the steering wheel is operated with
the i-ELOOP indicator light
flashing, it may feel heavier than
normal, however, this does not
indicate a malfunction. The steering
operation will return to normal when
the i-ELOOP indicator light turns
off.
Do not remove the jumper cables
while the i-ELOOP indicator light is
flashing.
7. When finished, carefully disconnect the cables in the reverse order
described in the illustration.
8. If the battery cover has been removed,
install it in the reverse order of
removal.
NOTE
Verify that the covers are securely
installed.
If Trouble Arises
Battery Runs Out
7-18
Mazda3_8GE4-EA-17F_Edition1 2017-4-7 11:59:21

( With Electric Parking Brake (EPB))
If the electric parking brake (EPB) cannot
be released when towing the vehicle,
transport the vehicle with all front and
rear wheels raised
off the ground as
shown in the figure. If the vehicle is
towed without raising the wheels off the
ground, the brake system could be
damaged.
Wheel dollies
Tiedown Hooks*
CAUTION
Do not use the front and rear tiedown
eyelets for towing the vehicle.
They have been designed only for securing
the vehicle to a transport vessel during
shipping.
Using the eyelets for any other purpose
could result in the vehicle being damaged.
▼ Tiedown Hooks
1. Remove the tiedown eyelet and the lug
wrench from the luggage compartment
(page 7-3).
2. Wrap a flathead screwdriver or similar
tool with a soft c loth to prevent
damage to a painted bumper, and open
the cap located on the front or rear
bumper.
Front
Rear
If Trouble Arises
Emergency Towing
*Some models.7-23
Mazda3_8GE4-EA-17F_Edition1 2017-4-7 11:59:21

(4–Door)
(5–Door)
CAUTION
Do not use excessive force as it may
damage the cap or scratch the painted
bumper surface.
NOTE
Remove the cap completely and store it
so as not to lose it.
3. Securely install the tiedown eyeletusing the lug wrench.
Front

Tiedown eyelet
Lug wrench
Rear

Lug wrench
Tiedown eyelet
4. Hook the tying ro pe to the tiedown
eyelet.
CAUTION
If the tiedown eyelet is not securely
tightened, it may loosen or disengage
from the bumper when tying the
vehicle. Make sure that the tiedown
eyelet is securely tightened to the
bumper.
If Trouble Arises
Emergency Towing
7-24
Mazda3_8GE4-EA-17F_Edition1 2017-4-7 11:59:21

SignalWarning
Check Engine LightIf this light illuminates while driving, the vehicle may have a
problem. It is important to
note the driving cond itions when the light illuminated and consult an Authorized Mazda
Dealer.
The check engine light may illumi nate in the following cases:
The fuel tank level being very low or approaching empty.The engine's electrical system has a problem.The emission control system has a problem.The fuel-filler cap is missing or not tightened securely.
If the check engine light remains on, or it flashes continuousl y, do not drive at high speeds
and consult an Authorized Mazd a Dealer as soon as possible.
Automatic Trans-
axle Warning Light*
The indication/light illuminates when the transaxle has a problem.
CAUTION
If the automatic transaxle warning indication/ light illuminates, the transaxle has an electri‐
cal problem. Continuing to drive your Mazda in this condition could cause damage to your
transaxle. Consult an Authorized Mazda Dealer as soon as possible.
(Turns on)
TCS/DSC Indicator
Light If the light stays on, the TCS, DSC or the brake assist system
may have a malfunction and
they may not operate correctly. Take your vehicle to an Authori zed Mazda Dealer.
Air Bag/Seat Belt
Pretensioner System Wa r n i n g L i g h t A system malfunction is
indicated if the warning light constantly flashes, constantly illu-
minates or does not illuminate a t all when the ignition is switched ON. If any of these
occur, consult an Authorized Mazd a Dealer as soon as possible. The system may not oper-
ate in an accident.WARNING
Never tamper with the air bag/pretensioner systems and always have an Authorized Mazda
Dealer perform all servicing and repairs:
Self-servicing or tampering with the systems is dangerous. An air bag/pretensioner could
accidentally activate or become disabled causing serious injury or death.
If Trouble Arises
Warning/Indicator Lights and Warning Sounds
*Some models.7-29
Mazda3_8GE4-EA-17F_Edition1 2017-4-7 11:59:21

SignalWarning
(Flashing)
Tire Pressure Moni-
toring System Warn-
ing Light
*
If the tire pressure m onitoring system has a malfunction, the t ire pressure warning light
flashes for about 1 minute when the ignition is switched ON and then continues illuminat-
ing. Have your vehicle checked by an Authorized Mazda Dealer as soon as possible.
WARNING
If the tire pressure monitoring system warning light illuminates or flashes, or the tire pres‐
sure warning beep sound is heard, decrease vehicle speed immediately and avoid sudden
maneuvering and braking:
If the tire pressure monitoring system warning light illuminates or flashes, or the tire pres‐
sure warning beep sound is heard, it is dangerous to drive the vehicle at high speeds, or
perform sudden maneuvering or braking. Vehicl e drivability could worsen and result in an
accident.
To determine if you have a slow leak or a flat, pull over to a safe position where you can
check the visual condition of the tire and determine if you have enough air to proceed to a
place where air may be added and the system monitored again by an Authorized Mazda
Dealer or a tire repair station.
Do not ignore the TPMS Warning Light:
Ignoring the TPMS warning light is dangerous, even if you know why it is illuminated. Have
the problem taken care of as soon as possible before it develops into a more serious situa‐
tion that could lead to tire failure and a dangerous accident.
(Red)
(Turns on)
KEY Warning Light If any malfunction occurs in the keyless entry system, it illum
inates continuously.
CAUTION
If the key warning indicator light illuminates or the push button start indicator light (am‐
ber) flashes, the engine may not start. If the en gine cannot be started, try starting it using
the emergency operation for starting the engine , and have the vehicle inspected at an Au‐
thorized Mazda Dealer as soon as possible.
Refer to Emergency Operation for Starting the Engine on page 4- 10.
Security Indicator
Light If the engine does not start with the correct key, and the secu
rity indicator light remains
illuminated or flashing, try the following:
Make sure the key is within the operational range for signal transmission. Switch the igni-
tion off, and then restart the e ngine. If the engine does not s tart after 3 or more tries, con-
tact an Authorized Mazda Dealer.
(Amber)
High Beam Control System (HBC)
Wa r n i n g L i g h t
*
The light remains turned on if th ere is a problem with the system. Have your vehicle in-
spected at an Authorized Mazda Dealer.
NOTE
If the windshield area in fr ont of the Forward Sensing Camera (FSC) is fogged or ob-
structed, the light turns on temporarily. If the light remains turned on, there may be a
problem with the system.
If Trouble Arises
Warning/Indicator Lights and Warning Sounds
7-30*Some models.
Mazda3_8GE4-EA-17F_Edition1 2017-4-7 11:59:21

SignalWarning Action to be taken
Low Washer
Fluid Level Wa r n i n g
Light
*
This warning light indicates that little washer
fluid remains. Add washer fluid (page 6-27).
Door-Ajar
Wa r n i n g Light The light turns on if a
ny door/liftgate is not
closed securely. Close the door/liftgate securely.

KEY Warning Light
Take the appropriate action and verify that the warning light t
urns off.
SignalCause Action to be taken
(Red)
(Flashing) The key battery is dead. Replace the key battery (page 6-35).
The key is not within the operation range.
Bring the key into the operation range
(page 3-7).
The key is placed in areas inside the cabin
where it is difficult for the key to be detect-
ed.
A key from another manufacturer similar to
the key is in the operation range. Take the key from another manufacturer
similar to the key out of the operation
range.
Without the ignition switched off, the key is
taken out of the cabin, and then all the
doors are closed. Bring the key back into the cabin.
If Trouble Arises
Warning/Indicator Lights and Warning Sounds
*Some models.7-35
Mazda3_8GE4-EA-17F_Edition1
2017-4-7 11:59:21

Index
Viewing the display................... 4-153
Rear Window Defogger. ................... 4-53
Rear Window Washer....................... 4-53
Rear Window Wiper.... ..................... 4-53
Recommended Oil.............................6-23
Recording of Vehicle Data................ 8-22
Recreational Towing......................... 3-52
Registering Your Vehicle in A Foreign
Country.............................................. 8-18
Replacement Fuse..............................................6-57
Key battery.................................. 6-35
Light Bulbs.................................. 6-42
Tires............................................. 6-40
Wheel........................................... 6-41
Wiper........................................... 6-29
Rocking the Vehicle.......................... 3-47
S
Safety Defects, Reporting................. 8-14
Satellite Radio................................... 5-44
Saving Fuel and Protection of the
Environment...................................... 3-45
Scheduled Maintenance...................... 6-4
Seats Front seat....................................... 2-5
Head restraint.............................. 2-10
Rear seat........................................ 2-7
Seat warmer................................... 2-6
Seat Belt System Automatic locking....................... 2-14
Emergency locking...................... 2-14
Extender....................................... 2-18
Pregnant women.......................... 2-14
3-point type................................. 2-15
Seat belt warning beep...................... 7-38
Security System Immobilizer system..................... 3-41
Theft-deterrent system................. 3-43
Smart Brake Support (SBS)............ 4-128
Collision warning...................... 4-130
Smart Brake Support (SBS) indicator
light (red)................................... 4-130
Stopping the Smart Brake Support
(SBS) system operation............. 4-130
Smart City Brake Support
(SCBS)............................................ 4-124
Collision warning...................... 4-126
Smart City Brake Support (SCBS)
Indicator Light (Red).................4-126
Stopping the Smart City Brake
Support (SCBS) System
Operation................................... 4-127
Spare Tire............................................ 7-5
Specifications...................................... 9-4
Speedometer...................................... 4-13
Speed Unit Selector.......................... 4-13
SRS Air Bags Front passenger occupant
classification system.................... 2-61
How the SRS air bags work........ 2-53
Limitations to SRS air bag.......... 2-59
Monitoring................................... 2-65
SRS air bag deployment
criteria.......................................... 2-58
Supplemental restraint system
components.................................. 2-51
Starting the Engine..............................4-5
Steering Wheel.................................. 3-30
Horn............................................. 4-55
Storage Compartments.................... 5-136
Center console........................... 5-136
Glove compartment................... 5-136
Overhead console...................... 5-136
Rear coat hooks......................... 5-138
Sunshade............................................3-40
Sunvisors......................................... 5-129
T
Tachometer........................................ 4-15
10-7
Mazda3_8GE4-EA-17F_Edition1 2017-4-7 11:59:21