engine MAZDA MODEL 3 HATCHBACK 2020 (in English) Repair Manual

Antilock Brake System(ABS)
▼Antilock Brake System (ABS)
The ABS control unit continuously
monitors the speed of each wheel. If one
wheel is about to lock up, the ABS
responds by automatically releasing and
reapplying that wheel's brake.

The driver will feel a slight vibration in
the brake pedal and may hear a chattering
noise from the brake system. This is
normal ABS system operation. Continue
to depress the brake pedal without
pumping the brakes.

The warning light turns on when the
system has a malfunction.
Refer to ABS Warning
Indication/Warning
Light on page 7-30.
WA R N I N G
Do not rely on ABS as a substitute for safe
driving:
The ABS cannot compensate for unsafe
and reckless driving, excessive speed,
tailgating (following another vehicle too
closely), driving on ice and snow, and
hydroplaning (reduced tire friction and
road contact because of water on the road
surface). You can still have an accident.
NOTE
Braking distances may be longer on
loose surfaces (snow or gravel, for
example) which usually have a hard
foundation. A vehicle with a normal
braking system may require less
distance to stop under these conditions
because the tires will build up a wedge
of surface layer when the wheels skid.
The sound of the ABS operating may be
heard when starting the engine or
immediately after starting the vehicle,
however, it does not indicate a
malfunction.
When Driving
ABS/TCS/DSC
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Traction Control System(TCS)
▼Traction Control System (TCS)
The Traction Control System (TCS)
enhances traction and safety by controlling
engine torque and braking. When the TCS
detects driving wheel slippage, it lowers
engine torque and operates the brakes to
prevent loss of traction.

This means that on a slick surface, the
engine adjusts autom
atically to provide
optimum power to th e drive wheels,
limiting wheel spin a nd loss of traction.

The warning light turns on when the
system has a malfunction.
Refer to TCS/DSC I ndication/Indicator
Light (Turns on) on page 7-32.
WA R N I N G
Do not rely on the Traction Control System
(TCS) as a substitute for safe driving:
The Traction Control System (TCS) cannot
compensate for unsafe and reckless
driving, excessive speed, tailgating
(following another vehicle too closely), and
hydroplaning (reduced tire friction and
road contact because of water on the road
surface). You can still have an accident.
Use snow tires or tire chains and drive at
reduced speeds when roads are covered
with ice and/or snow:
Driving without proper traction devices on
snow and/or ice-covered roads is
dangerous. The Traction Control System
(TCS) alone cannot provide adequate
traction and you could still have an
accident.
NOTE
To turn off the TCS, press the DSC OFF
switch (page 4-78).
▼ TCS/DSC Indicator Light
This indicator light stays on for a few
seconds when the ignition is switched ON.
If the TCS or DSC is operating, the
indicator light flashes.

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
Authorized Mazda Dealer.
NOTE
In addition to the indicator light
flashing, a slight lugging sound will
come from the engine. This indicates
that the TCS/DSC is operating properly.
On slippery surfaces, such as fresh
snow, it will be impossible to achieve
high rpm when the TCS is on.
When Driving
ABS/TCS/DSC
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Dynamic Stability Control(DSC)
▼Dynamic Stability Control (DSC)
The Dynamic Stability Control (DSC)
automatically controls braking and engine
torque in conjunction with systems such as
ABS and TCS to help control side slip
when driving on slippery surfaces, or
during sudden or evasive maneuvering,
enhancing vehicle safety.

Refer to ABS (page 4
-75) and TCS (page
4-76).

DSC operation is possible at speeds
greater than 20 km/h (12 mph).

The warning light turns on when the
system has a malfunction.
Refer to TCS/DSC Indication/Indicator
Light (Turns on) on page 7-32.
WA R N I N G
Do not rely on the Dynamic Stability
Control as a substitute for safe driving:
The Dynamic Stability Control (DSC)
cannot compensate for unsafe and reckless
driving, excessive speed, tailgating
(following another vehicle too closely), and
hydroplaning (reduced tire friction and
road contact because of water on the road
surface). You can still have an accident.
CAUTION
 The DSC may not operate correctly
unless the following are observed:
 Use tires of the correct size
specified for
your Mazda on all 4 wheels.
 Use tires of the same manufacturer,
brand and tread pattern on all 4
wheels.
 Do not mix worn tires.
 The DSC may not operate correctly when
tire chains are used or a temporary spare
tire is installed because the tire diameter
changes.
NOTE
If there is a problem with the DSC, the Hill
Launch Assist (HLA) may not operate.
Refer to Hill Launch Assist (HLA) on page
4-73.
▼ TCS/DSC Indicator Light
This indicator light stays on for a few
seconds when the ignition is switched ON.
If the TCS or DSC
is operating, the
indicator light flashes.

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
Authorized Mazda Dealer.
When Driving
ABS/TCS/DSC
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▼DSC OFF Indicator Light
This indicator light
stays on for a few
seconds when the ignition is switched ON.
It also illuminates when the DSC OFF
switch is pressed and TCS/DSC is
switched off.
Refer to DSC OFF Switch on page 4-78.

If the light remains illuminated and the
TCS/DSC is not switched off, take your
vehicle to an Authorized Mazda Dealer.
The DSC may have a malfunction.
▼ DSC OFF Switch
Press the DSC OFF switch to turn off the
TCS/DSC. The DSC OFF indicator light
in the instrument cluster and the DSC OFF
switch indicator lig
ht will illuminate.
1. DSC OFF switch indicator light

Press the switch again to turn the
TCS/DSC back on. The DSC OFF
indicator light and the DSC OFF switch
indicator light will turn off.
NOTE
When DSC is on and you attempt to free
the vehicle when it is stuck, or drive it
out of freshly fallen snow, the TCS (part
of the DSC system) will activate.
Depressing the accelerator will not
increase engine power and freeing the
vehicle may be difficult. When this
happens, turn off the TCS/DSC.
If the TCS/DSC is off when the engine is
turned off, it aut omatically activates
when the ignition is switched ON.
Leaving the TCS/DSC on will provide
the best traction.
If the DSC OFF switch is pressed and
held for 10 seconds or more, the DSC
OFF switch malfunction detection
function operates and the DSC system
activates automatically. The DSC OFF
indicator light turns off while the DSC
system is operative.
(Vehicles with Smart Brake Support
(SBS))
If the Smart Brake Support (SBS)
operates with the TCS/DSC turned off,
the TCS/DSC becomes operational
automatically.
When Driving
ABS/TCS/DSC
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Drive Selection*
▼Drive Selection
Drive selection is a system to switch the
vehicle's drive mode. When the sport
mode is selected, vehicle's response
against accelerator operation is enhanced.
This provides additional quick
acceleration which may be needed to
safely make maneuvers such as lane
changes, merging onto freeways, or
passing other vehicles.
CAUTION
Do not use the sport mode when driving on
slippery roads such as wet or snow-covered
roads. It may cause tire slipping.
NOTE
When the sport mode is selected, driving
at higher engine speeds increases and it
may increase fuel consumption. Mazda
recommends that you cancel the sport
mode on normal driving.
Drive mode cannot be switched in the
following conditions:
ABS/TCS/DSC is operating
Cruise control* is operating.
The Mazda Radar Cruise Control with
Stop & Go function (MRCC with Stop
& Go function) System
* is operating.
Traffic Jam Assist (TJA)* is operating.
Steering wheel is being operated
abruptly
▼Drive Selection Switch
Press the drive sele
ction switch forward
(SPORT) to select the sport mode.
Pull the drive selecti on switch back (OFF)
to cancel the sport mode.

NOTE
In the following cases, the drive
selection is canceled.
The ignition is switched OFF.
Cruise Control is set.
Mazda Radar Cruise Control with
Stop & Go function (MRCC with Stop
& Go function) is set.
Traffic Jam Assist (TJA) is set.
Depending on the driving conditions
when sport mode is selected, the vehicle
may perform shift-down or slightly
accelerate.
When Driving
Drive Selection
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Power Steering
▼Power Steering
Power steering is only operable when
the engine is running. If the engine is off
or if the power steering system is
inoperable, you can still steer, but it
requires more physical effort.
If the steering feel
s stiffer than usual
during normal driving or the steering
vibrates, consult an Authorized Mazda
Dealer.
The warning indication notifies the
driver of system abnormalities and
operation conditions.
Refer to Power Steering Malfunction
Indication/Indicator Light on page
7-29.
When Driving
Power Steering
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Slippery roads such as ice or snow-bound
roads (Tires could spin causing you to
lose vehicle control, or the stop hold
control may not operate.)
 Long, descending slopes (to maintain
distance between vehicles, the system
automatically and continuously applies
the brakes which could result in the loss
of brake power.)
 Slopes with a steep gradient (The vehicle
ahead may not be detected correctly.)
 Two-wheeled vehicles such as
motorcycles or bicycles are ahead.
For safety purposes, switch the MRCC
system off when it is not being used.
Leaving the MRCC system turned on when
it is not in use is dangerous as it could
operate unexpectedly, resulting in an
accident.
CAUTION
 Turn the system
off when the vehicle is
running on a chassis roller.
 If your vehicle is towed or you are towing
something, switch the MRCC system off
to prevent an unexpected operation.
NOTE
The MRCC system does not detect the
following as physical objects.
Vehicles approaching in the opposite
direction
Pedestrians
Stationary objects (stopped vehicles,
obstructions)
If a vehicle ahead is traveling at an
extremely low speed, the system may
not detect it correctly.
If there is a structure on the road or an
object (such as a monorail) at a low
height off the ground in front of the
vehicle, the system may operate.
Therefore, do not use the MRCC.
Do not use the MRCC system under
conditions in which close proximity
warnings are frequently activated.
During headway control travel, the
system accelerates and decelerates your
vehicle in conjunction with the speed of
the vehicle ahead. However, if it is
necessary to accelerate for a lane
change or if the vehicle ahead brakes
suddenly causing you to close in on the
vehicle rapidly, accelerate using the
accelerator pedal or decelerate using
the brake pedal depending on the
conditions.
While the MRCC system is in use, it
does not cancel even if the shift lever is
operated and any intended engine
braking will not occur. If deceleration is
required, lower the vehicle speed setting
or depress the brake pedal.
While braking by the MRCC control is
operating, you might hear an operation
sound, however, this does not indicate a
problem.
The brake lights turn on while braking
by the MRCC control is operating,
however, they may not turn on while the
vehicle is on a down slope at the set
vehicle speed or traveling at a constant
speed and following a vehicle ahead.
Stop the headway control function to
switch the system to the cruise control
function.
Refer to the Settings section in the
Mazda Connect Owner's Manual.
When Driving
i-ACTIVSENSE
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Distance-between-vehicles guide‐line
(at 80 km/h (50 mph) vehicle speed) Indication on multi-information
display Indication on active driving dis‐
play
*1
Long (about 50 m (164 ft))
Medium (about 40 m (131 ft))
Short (about 30 m (98 ft))
Extremely short (about 25 m (82 ft))
*1 Displays a pop-up image in the active driving display only when the driver operates the switch.
NOTE
The distance-between-vehicles differs depending on the vehicle speed, and the slower the
vehicle speed, the shorter the distance.
When the ignition is switched to ACC or OFF and then the engine is started again, the
system automatically sets the distance-between-vehicles to the previous setting.
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-inform ation display and a single
beep sound is heard.
The DSC has operated.
The Smart Brake Su pport (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 sh ifted 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.
Turning 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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▼Shift-up/Shift-down Request Display
The shift-up or shift-down request display
might be displayed while the MRCC is
operating. When this occurs, shift gears
because the gear position is not
appropriate.
Request Indication on display
Shift up Shift Up to a Higher Gear
Shift down Shift Do wn to a Lower Gear
NOTE
If the gears are not shifted up even
though the shift-up request indication is
displayed, load will be applied to the
engine and the MRCC might be
automatically canceled or engine
damage could occur.
If the gears are not shifted down even
though the shift-down request indication
is displayed, the MRCC might be
automatically canceled or engine
stalling could occur.
Mazda Radar Cruise
Control with Stop & Go
function (MRCC with Stop & Go function) (Automatic
Transmission)
*
▼Mazda Radar Cruise Control with
Stop & Go function (MRCC with
Stop & Go function)
The MRCC with St
op & Go function
system is designed to maintain headway
control
*1 with a vehicle ahead according
to your vehicle's speed using a front radar
sensor to detect the distance to the vehicle
ahead and a preset vehicle speed without
you having to use the accelerator or brake
pedals.
*1 Headway Control: Control of the
distance between your vehicle and the
vehicle ahead detected by the Mazda
Radar Cruise Control (MRCC)
system.
Additionally, if your vehicle starts closing
in on the vehicle ahead such as if the
vehicle ahead brakes suddenly, a warning
sound and a warning indication in the
display are activated simultaneously to
alert you to maintain a sufficient distance
between the vehicles.
If the vehicle ahead stops while you are
following behind it, y our vehicle will stop
and be held stopped automatically (stop
hold control), and headway control will
resume when you resume driving the
vehicle such as by pressing the RES
switch.
Also refer to the fo llowing before using
the MRCC with Stop & Go function.
When Driving
i-ACTIVSENSE
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