engine MAZDA MODEL 3 SEDAN 2019 Repair Manual

▼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 4-77.

If the light remains i lluminated 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 sw
itch to turn off the
TCS/DSC. The DSC OFF indicator light
in the instrument cluster and the DSC OFF
switch indicator light will illuminate.
1. DSC OFF switch indicator light

Press the switch a gain 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 automatically 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 turn s 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 s
ystem to switch the
vehicle's drive mode. When the sport
mode is selected, v ehicle'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 selection 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.
▼ Select Mode Indicator Light
When the sport mode is selected, the select
mode indicator light turns on in the
instrument cluster.
1. Select mode indicator light
When Driving
Drive Selection
4-78*Some models.
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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 feels 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
7-28.
CAUTION
Never hold the steering wheel to the
extreme left or right for more than 5
seconds with the engine running. This
could damage the power steering system.
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.)
 Two-wheeled vehicles such as
motorcycles or bicycles are ahead.
 Slopes with a steep gradient (The vehicle
ahead may not be detected correctly,
your vehicle may slide while stopped by
the stop hold control, and it may
accelerate suddenly after it starts
moving.)
For safety purposes, switch the MRCC
system off when it is not being used.
CAUTION
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.
The sound of the automatic brakes
operating may be heard, however, it
does not indicate a problem.
The brake lights tu
rn on while the
MRCC automatic braking is operating.
When Driving
i-ACTIVSENSE
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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.
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 presse d 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-information 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 front radar sensor cannot detect
target objects (during rain, fog, snow or
other inclement weather conditions, or
when the radiator grille is dirty).
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 parking brake is applied.
Any of the doors is opened.
The driver's seat belt is unfastened.
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.
When Driving
i-ACTIVSENSE
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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.
▼ 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 he adway 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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For safety purposes, switch the MRCC with
Stop & Go function system off when it is not
being used.
Do not get out of the vehicle while the stop
hold control is operating:
Getting out of the vehicle while the stop
hold control is operating is dangerous as
the vehicle may move unexpectedly and
result in an accident. Before getting out of
the vehicle, switch the MRCC with Stop &
Go function system off, shift the selector
lever to the P position, and apply the
parking brake.
CAUTION
If your vehicle is towed or you are towing
something, switch the MRCC with Stop &
Go function system off to prevent an
unexpected operation.
NOTE
The MRCC with Stop & Go function
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 with
Stop & Go function.
Do not use the MRCC with Stop & Go
function 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 with Stop & Go
function system is in use, it does not
cancel even if the selector lever is
operated and any intended engine
braking does not occur. If deceleration
is required, lower the set speed or
depress the brake pedal.
The sound of the automatic brakes
operating may be heard, however, it
does not indicate a problem.
The brake lights turn on while the
MRCC with Stop & Go function
automatic braking is operating.
When Driving
i-ACTIVSENSE
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▼Setting the System
The MRCC with Stop & Go function
system operates when all of the following conditions
are met.
Vehicle speed is 0 km/h (0 mph) to 145 km/h (90 mph)
The MRCC with Stop & Go function is turned on.
The brake pedal is not depressed.
The parking brake is released (E lectric Parking Brake (EPB) indicator light is turned off).
There is no problem with the DSC.
All the doors are closed.
The driver's seat belt is fastened.
The selector lever is in the drive (D) position or manual (M) p osition (manual mode).
NOTE
In the following cases, the MRCC with Stop & Go function system is canceled when the
vehicle is traveling at 30 km/h (20 mph) or less and “Mazda Radar Cruise Control
Disabled Under 30 km/h (20mph)” is displayed in the multi-information display.
The Forward Sensing Camera (FSC) cannot de tect target objects (There is problem
with the Forward Sensing Camera (FSC) or windshield is dirty).
There is a problem with the stop hold control function.
There is a problem with the Electric Parking Brake (EPB).
When the MRCC with Stop & Go function system is operating, Distance & Speed Alert
(DSA), and Smart Brake Support (SBS) also turns on automatically.
It may not be possible to set the MRCC with Stop & Go f unction system directly after
starting the engine, while the DSC operation is being checked.
Turning on the system
1. CANCEL switch
2. RES switch
3. MRCC switch

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
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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Traffic Jam Assist (TJA)*
▼Traffic Jam Assist (TJA)
The TJA is a system which consists of a
headway control fu
nction and steering
assist function for reducing driver fatigue
when driving in a traffic jam on
expressways or highways.
The system performs headway control to
maintain a constant distance between your
vehicle and a vehicle ahead at a preset
vehicle speed without you having to use
the accelerator or brake pedal. Even
further, with the steering assist function,
when vehicle lane lines are detected, the
function assists the driver in keeping the
vehicle within the lan e lines. If lane lines
are not detected, the function provides the
driver driving assistance in keeping the
vehicle along the motion path with the
vehicle ahead.
WA R N I N G
Do not rely completely on TJA:
 The TJA is not an automated driving
system. In addition, the functions have
limitations. Do not rely completely on the
system and always stay on course using
the steering wheel.
 Set a vehicle speed within the speed limit
according to the road conditions and the
weather conditions.
The TJA may not be able to detect a
vehicle ahead depending on the type of
vehicle ahead and its conditions, the
weather conditions, and the road
conditions. Additionally, the system
might be unable to decelerate sufficiently
if a vehicle ahead applies the brakes
suddenly, another vehicle cuts into the
driving lane, or the difference in vehicle
speed between your vehicle and the
vehicle ahead is larger, which could
result in an accident. Check the
surrounding conditions and always drive
carefully while keeping a safe distance
from vehicles ahead and on-coming
vehicles.
 While the TJA is in use, any intended
engine braking does not occur even if
you shift the shift lever (manual
transmission) or the selector lever
(automatic transmission). If deceleration
is required, lower the vehicle speed
setting or depress the brake pedal.

For the purposes of safety, switch the TJA
off when it is not being used.

Do not use the TJA under the following
conditions. Otherwise, it may result in an
accident.
 General roads other than expressways or
highways (Driving under these
conditions using the TJA is not possible.)
 Roads with sharp curves and where
vehicle traffic is heavy with insufficient
space between vehicles. Roads where
frequent and repetitive acceleration and
deceleration occur (Driving under these
conditions using the TJA is not possible).
When Driving
i-ACTIVSENSE
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