engine MERCEDES-BENZ GLA SUV 2017 Repair Manual

G
WARNING
Combustion engines emit poisonous exhaust
gases such as carbon monoxide. Inhaling
these exhaust gases leads to poisoning. There is a risk of fatal injury. Therefore never leave
the engine running in enclosed spaces with-
out sufficient ventilation. G
WARNING
Flammable materials introduced through
environmental influence or by animals can
ignite if in contact with the exhaust system or parts of the engine that heat up. There is a risk
of fire.
Carry out regular checks to make sure that
there are no flammable foreign materials in
the engine compartment or in the exhaust
system.
General notes Vehicles with a petrol engine:
the engine runs
at a higher engine speed during the cold start
procedure so that the catalytic converter can
reach operating temperature more quickly. The
sound of the engine may change as a result.
Manual transmission You can only start the engine when the clutch
pedal is fully depressed.
X Depress the brake pedal and keep it
depressed.
X Depress the clutch pedal fully.
X Engage neutral i.
Automatic transmission X
Shift the transmission to position j
(Y page 155).
The transmission position indicator in the
multifunction display shows P(Y page 155).
i You can start the engine in transmission
position jand i. Starting procedure using the key To start the engine using the key instead of the
Start/Stop button, pull the Start/Stop button
out of the ignition lock.
X To start a diesel engine: turn the key to
position 2in the ignition lock (Y page 144).
The % preglow indicator lamp in the instru-
ment cluster lights up.
X Turn the key to position 3in the ignition lock
(Y page 144) and release it as soon as the
engine is running.
Starting procedure using the Start/
Stop button The Start/Stop button can be used to start the
vehicle manually without inserting the key in the
ignition lock. The key must be in the vehicle and the Start/Stop button must be inserted in the
ignition lock. This mode for starting the engine
manually operates independently of the ECO
start/stop automatic engine start function.
You can start the engine if a valid key is in the
vehicle. Switch off the engine and always take
the key with you when leaving the vehicle, even
if you leave it for only a short time. Observe the important safety notes.
X Vehicles with automatic transmission:
depress the brake pedal and keep it
depressed.
X Vehicles with manual transmission:
depress the clutch pedal and keep it
depressed.
X Press the Start/Stop button once
(Y page 144).
Vehicles with a petrol engine: the engine
starts.
Vehicles with a diesel engine: preglow is
activated and the engine starts. Pulling away
General notes G
WARNING
Vehicles with automatic transmission:
If the engine speed is above the engine idling speed and you then engage transmission 146
DrivingDriving and parking

position
Dor R, the vehicle may accelerate
suddenly. There is a risk of an accident.
When engaging transmission position Dor R,
always keep the brake pedal firmly depressed
and do not depress the accelerator pedal at
the same time.
! Vehicles with manual transmission:
change gear in good time and avoid spinning
the wheels. You could otherwise damage the
vehicle.
Depress the accelerator carefully when pulling
away.
The vehicle automatically locks centrally once
you have pulled away. The locking knobs in the
doors drop down.
You can open the doors from the inside at any
time.
You can also deactivate the automatic locking
feature (Y page 229).
Vehicles with automatic transmission: it is
possible to shift the transmission from position j to the desired position only if you depress
the brake pedal. Only then can the parking lock be deactivated.
All vehicles (except Mercedes-AMG vehi-
cles): if you do not depress the brake pedal, the
DIRECT SELECT lever can still be moved but the
parking lock remains engaged.
Mercedes-AMG vehicles: if you do not depress
the brake pedal, the selector lever can still be
moved but the parking lock remains engaged.
Vehicles with automatic transmission: at
transmission fluid temperatures below Ò20 †
you can only shift out of position jinto another
transmission position when the engine is run-
ning.
i Vehicles with automatic transmission:
upshifts take place at higher engine speeds
after a cold start. This helps the catalytic con- verter to reach its operating temperature
more quickly.
Vehicles with automatic transmission: infor-
mation on automatically releasing the electric
parking brake (Y page 168). Pulling away with a trailer
To ensure that you do not roll backwards when
pulling away on an uphill slope, apply the electric
parking brake.
X Press and hold handle :.
The electric parking brake continues to brake
and prevents the vehicle from rolling back-
wards.
The red !indicator lamp in the instrument
cluster remains lit.
X Depress the accelerator pedal.
X As soon as the vehicle/trailer combination is
held by the driving force of the engine, release
handle :.
the electric parking brake is released
The red !indicator lamp in the instrument
cluster goes out.
Further information on the electric parking
brake (Y page 167).
Hill start assist Hill start assist helps you when pulling away for-
wards or in reverse on an uphill gradient. It holds the vehicle for a short time after you have
removed your foot from the brake pedal. This
gives you enough time to move your foot from
the brake pedal to the accelerator pedal and
depress it before the vehicle begins to roll. G
WARNING
After a while, hill start assist no longer holds
the vehicle and it may roll away. There is a risk of an accident and injury.
Therefore, quickly move your foot from the
brake pedal to the accelerator pedal. Never
leave the vehicle when it is held by hill start
assist. Driving
147Driving and parking Z

Hill start assist is not active if:
R you are pulling away on a level road or a
downhill gradient
R the transmission is in position ion vehicles
with automatic transmission
R the electric parking brake is applied
R ESP ®
is malfunctioning
Further information on holding the vehicle sta-
tionary on uphill gradients (Y page 158).ECO start/stop function
Introduction The ECO start/stop function switches the
engine off automatically if the vehicle is stopped
under certain conditions.
When the vehicle pulls away again, the engine
starts automatically. The ECO start/stop func-
tion thereby helps you to reduce the fuel con-
sumption and emissions of your vehicle.
Important safety notes G
WARNING
If the engine is switched off automatically and you exit the vehicle, the engine is restarted
automatically. The vehicle may begin moving. There is a risk of accident and injury.
If you wish to exit the vehicle, always turn off
the ignition and secure the vehicle against
rolling away.
General notes :
ECO start/stop display
The ECO start/stop function is switched on
whenever you start the engine using the key or
the Start/Stop button.
If the è ECO symbol is shown on the multi-
function display, the ECO start/stop function switches the engine off automatically if the vehi-
cle stops moving.
If the ECO start/stop function has been man-
ually switched off (Y page 149)or a malfunction
has caused the system to be switched off, the
è orç ECO symbol is not displayed.
Mercedes-AMG vehicles: the ECO start/stop
function is available only in drive program C.
Automatic engine switch-off General notes
The ECO start/stop function is operational and
the è ECO symbol is displayed on the mul-
tifunction display if:
R the indicator lamp in the ECO button is lit
green
R the off-road program is deactivated (vehicles
with automatic transmission)
R the outside temperature is within the range
that is suitable for the system
R the engine is at normal operating temperature
R the set temperature for the vehicle interior
has been reached
R the battery is sufficiently charged
R the system does not detect moisture on the
windscreen when the air-conditioning system
is switched on
R the bonnet is closed
R the driver's door is closed and the driver's
seat belt is fastened
If all conditions for automatic engine switch-off
are not fulfilled, the çECO symbol is shown.
All the vehicle's systems remain active when the engine is switched off automatically.
The engine can be switched off automatically a
maximum of four times (initial stop, then three
subsequent stops) in succession. The çECO
symbol is shown on the multifunction display
after the engine has been started automatically
for the fourth time. When the èECO symbol
is shown on the multifunction display, automatic engine switch-off is possible again. 148
DrivingDriving and parking

Vehicles with manual transmission
The ECO start/stop function switches off the
engine automatically at low speeds.
X Brake the vehicle.
X Shift to neutral i(Ypage 153) (follow gear-
shift instruction :to shift to neutral i, as
necessary).
X Release the clutch pedal.
The engine is switched off automatically.
Vehicles with automatic transmission
If the vehicle is braked to a standstill with the
transmission in hori, the ECO start/stop
function switches off the engine automatically.
The HOLD function can be activated if the
engine has been switched off automatically. It is then not necessary to continue applying the
brakes during the automatic stop phase. When
you depress the accelerator pedal, the engine
starts automatically and the braking effect of
the HOLD function is deactivated.
Automatic engine start General notes
The engine is started automatically if:
R you switch off the ECO start/stop function by
pressing the ECO button
R you engage reverse gear k
R you unfasten your seat belt or open the driv-
er's door
R the vehicle starts to roll
R the brake system requires this
R the temperature in the vehicle interior devi-
ates from the set range
R the system detects moisture on the wind-
screen when the air-conditioning system is
switched on
R the battery's charge status is too low Vehicles with manual transmission
! Only engage gear when the clutch pedal is
depressed.
The engine is started automatically if you:
R depress the clutch pedal fully
R depress the accelerator pedal
Vehicles with automatic transmission The engine is started automatically if you:
R release the brake pedal in transmission posi-
tion hori when the HOLD function is not
active
R depress the accelerator pedal
R activate the off-road program
R move the transmission out of position j
Shifting the transmission to position jdoes
not start the engine.
If you shift the transmission from ktoh, the
ECO start/stop function is available as soon as
the è ECO symbol appears on the multifunc-
tion display.
Switching the ECO start/stop function
off/on X
To deactivate: press ECO button :.
Indicator lamp ;and the èorç ECO
symbol on the multifunction display go out.
X To activate: press ECO button :.
Indicator lamp ;lights up.
If all conditions for the automatic engine
switch-off (Y page 148)are fulfilled, the è
ECO symbol is shown in the multifunction dis- play.
If all conditions for the automatic engine
switch-off (Y page 148) are not fulfilled, the
ç ECO symbol is shown in the multifunc- Driving
149Driving and parking Z

tion display. If this is the case, the ECO start/
stop function is not available.
If indicator lamp ;is off, the ECO start/stop
function has been deactivated manually or as
the result of a malfunction. The engine will then
not be switched off automatically when the vehi- cle stops. AMG performance exhaust system
(Mercedes-AMG vehicles)
You can choose between different AMG Per-
formance exhaust system volumes using the
position of the exhaust flap.
If the ignition is switched off for less than four
hours, the previously selected setting is activa-
ted when the engine is next started. If the igni-
tion is switched off for more than four hours, the quietest setting is activated when the engine is
next started. Setting the volume:
X Press button :.
If you select the loudest setting, indicator
lamp ;lights up. Problems with the engine
Problem
Possible causes/consequences and
M MSolutions The engine does not
start. The HOLD function or Distance Pilot DISTRONIC is activated.
X Deactivate the HOLD function (Y page 187) or Distance Pilot
DISTRONIC (Y page 184).
X Try to start the engine again. The engine does not
start. The starter motor
can be heard. R
The engine electronics are malfunctioning
R The fuel supply is malfunctioning
Before attempting to restart the engine:
X Turn the key back to position gin the ignition lock.
or X Press the Start/Stop button repeatedly until all indicator lamps on
the instrument cluster go out.
X Try to start the engine again. Avoid excessively long and frequent
attempts to start the engine, as this will drain the battery.
If the engine does not start after several attempts:
X Consult a qualified specialist workshop. The engine does not
start. The starter motor
can be heard. The
reserve fuel warning
lamp is lit and the fuel
gauge display shows 0. The fuel tank is empty.
X Refuel the vehicle. 150
DrivingDriving an
d parking

Problem
Possible causes/consequences and
M
MSolutions The engine does not
start. You cannot hear
the starter motor. The on-board voltage is too low because the battery is too weak or
discharged.
X Jump-start the vehicle (Y page 325).
If the engine does not start despite attempts to jump-start it:
X Consult a qualified specialist workshop. The starter motor was exposed to excessively high thermal load.
X Allow the starter motor to cool down for approximately two minutes.
X Try to start the engine again.
If the engine still does not start:
X Consult a qualified specialist workshop. Vehicles with a petrol
engine:
The engine is not running
smoothly and is misfir-
ing. The engine electronics or a mechanical component of the engine
management system is malfunctioning.
X Only depress the accelerator pedal slightly.
Otherwise, non-combusted fuel may get into the catalytic converter
and damage it.
X Have the cause rectified immediately at a qualified specialist work-
shop. The coolant temperature
display is showing more
than 120 †. The coolant warning lamp may also
be on and a warning tone
may sound. The coolant level is too low. The coolant is too hot and the engine is not
being cooled sufficiently.
X Stop as soon as possible and allow the engine and the coolant to
cool down.
X Check the coolant level (Y page 305). Observe the warning notes
as you do so and top up the coolant if necessary. If the coolant level is correct, the engine radiator fan may be faulty. The
coolant is too hot and the engine is not being cooled sufficiently.
X If the coolant temperature is below 120 †, you can continue driving
to the nearest qualified specialist workshop.
X Avoid heavy loads on the engine as you do so, e.g. driving in moun-
tainous terrain and stop-start traffic. DYNAMIC SELECT button (all vehicles
except Mercedes-AMG vehicles)
Use the DYNAMIC SELECT button to change the drive program. Depending on the drive program
selected, the following vehicle characteristics
will change:
R the drive (engine and transmission manage-
ment)
R the suspension (vehicles with adjustable
damping)
R the steering R
the availability of the ECO start/stop function
R the climate control
If the ignition is switched off for less than four
hours, the previously selected drive program is
activated when the engine is next started. If the ignition is switched off for more than four hours,
drive program Cis activated when the engine is
next started. DYNAMIC SELECT button (all vehicles except Mercedes-AMG vehicles)
151Driving and parking Z

X
Press DYNAMIC SELECT controller :as
many times as necessary until the desired
drive program is selected.
The selected drive program appears in the
multifunction display. After five seconds the
display goes out and the status icon of the
selected drive program appears.
In addition, the current drive program settings are shown briefly on the multimedia system
display.
i For a few countries, the ECO start/stop
function is deactivated at the factory due to
the quality of the available fuel. In this case,
the ECO start/stop function is not available in
any drive program, regardless of what is
shown on the multimedia system display.
Available drive programs: C
Comfort Comfortable and economi-
cal driving characteristics
S
Sport Sporty driving characteris-
tics
I
Individual Individual settings
Off-road
Optimal driving characteris-
tics for easily negotiable off-
road terrain E
Economy Particularly economical
driving characteristics
Additional information on drive programs
(Y page 159).
You can also shift gears yourself using the steer- ing wheel gearshift paddles. Further information
on manual gearshifting (Y page 161). DYNAMIC SELECT controller
(Mercedes-AMG vehicles)
Use the DYNAMIC SELECT controller to change the drive program. Depending on the drive pro-
gram selected, the following vehicle character-
istics will change:
R the drive
R the transmission management
R ESP ®
R the suspension (vehicles with AMG RIDE
CONTROL)
R the availability of the ECO start/stop function
R the availability of gliding mode
If the ignition is switched off for less than four
hours, the previously selected drive program is
activated when the engine is next started. If the
ignition is switched off for more than four hours, drive program Cis activated when the engine is
next started. X
Turn DYNAMIC SELECT controller :as many
times as necessary until the desired drive
program is selected.
The selected drive program appears in the
multifunction display. After five seconds the
display goes out and the status icon of the
selected drive program appears.
The drive program indicator on DYNAMIC
SELECT controller :lights up in red.
Available drive programs: I
Individual Individual settings
C
Comfort Comfort-orientated, engine
and transmission settings
optimised for economy S
Sport Sporty engine and trans-
mission settings152
DYNAMIC SELECT controller (Mercedes-AMG vehicles)Driving and parking

S+
Sport Plus Particularly sporty trans-
mission settings
RACE
Maximum sportiness and
engine and transmission
settings suitable for the
racetrack Additional information on drive programs
(Y
page 159).
You can also change gear yourself using the
steering wheel gearshift paddles. Further infor-
mation on manual gearshifting (Y page 161).Manual transmission
Gear lever
! Only engage gear when the clutch pedal is
depressed.
! When shifting to
5thand 6thgear, you must
press the shift lever to the right. Otherwise,
you could shift unintentionally into 3rdor4th
gear and damage the engine or transmission.
If you shift down at too high a speed (trans-
mission braking), this can cause the engine to
overrev, leading to engine damage.
Do not use the clutch bite point to keep the
vehicle stationary on uphill gradients. There is otherwise a risk of damaging the clutch.
! On long and steep downhill gradients, espe-
cially if the vehicle is laden or towing a trailer,
you must select gear 1,2or3 in good
time. By doing so, you will make use of the
braking effect of the engine. This relieves the
load on the brake system and prevents the
brakes from overheating and wearing too
quickly. k
Reverse gear
1 -6
Forward gears Engaging neutral N
X
Depress the clutch pedal fully.
X Shift the gear lever to position N:. Engaging reverse gear
! Select reverse gear
konly when the vehi-
cle is stationary. You could otherwise damage the transmission.
X Pull the gear lever up, push it to the left and
then pull it back.
The ECO start/stop function is not available
when reverse gear is engaged. For further infor-
mation on the ECO start/stop function, see
(Y page 148). Manual transmission
153Driving and parking Z

Gearshift recommendation
The gearshift recommendation assists you in
adopting a fuel-efficient driving style. The rec-
ommended gear is shown on the multifunction
display.
X Shift gear according to gearshift recommen-
dation :when shown in the multifunction
display of the instrument cluster. Drive programs
Drive program C (Comfort) Drive program
Cis characterised by the follow-
ing:
R the vehicle exhibits comfortable, economical
driving characteristics.
R the vehicle has improved driving stability, e.g.
on slippery road surfaces.
Drive program S (Sport) Drive program
Sis characterised by the follow-
ing:
R sporty engine settings.
Drive program I (Individual) In drive program
I, the following properties of
the drive program can be selected:
R the drive (engine and transmission manage-
ment)
R the suspension (vehicles with adjustable
damping)
R the steering
R the availability of the ECO start/stop function
R the climate control
Information on configuring drive program Iwith
the multimedia system can be found in the Dig-
ital Owner's Manual. Offroad drive program The
Offroad drive program is characterised by
the following:
R the vehicle exhibits optimised driving charac-
teristics for easily negotiable off-road terrain.
Drive program E (Economy) Drive program
Eis characterised by the follow-
ing:
R the vehicle exhibits particularly economical
driving characteristics.
R the vehicle has improved driving stability, e.g.
on slippery road surfaces.
R the performance of the air-conditioning and
heating systems is reduced. Automatic transmission
Important safety notes
G
WARNING
If the engine speed is above the idling speed
and you engage transmission position Dor R,
the vehicle could pull away suddenly. There is a risk of an accident.
When engaging transmission position Dor R,
always firmly depress the brake pedal and do not simultaneously accelerate. G
WARNING
The automatic transmission switches to neu-
tral position Nwhen you switch off the engine.
The vehicle may roll away. There is a risk of an
accident.
After switching off the engine, always switch
to parking position P. Prevent the parked vehi-
cle from rolling away by applying the parking
brake. 154
Automatic transmissionDriving and parking

DIRECT SELECT lever
Overview of transmission positions j
Park position with parking lock
k Reverse gear
i Neutral
h Drive
All vehicles (except Mercedes-AMG vehi-
cles): the DIRECT SELECT lever is on the right of
the steering column.
For information on the selector lever in
Mercedes-AMG vehicles (Y page 156).
The DIRECT SELECT lever always returns to its
original position. The current transmission posi-
tion j,k,iorh is shown in the transmis-
sion position display in the multifunction display (Y page 155).
Transmission position and drive pro-
gram display The current transmission position and drive pro-
gram appear on the multifunction display. :
Transmission position
; Gear
= Drive program display
The arrows in the transmission position display
show how and into which transmission positions
you can shift using the DIRECT SELECT lever.
If the transmission position display on the mul-
tifunction display is not working, you should pull away carefully to check whether the desired
transmission position is engaged. Ideally, you
should select transmission position
hand
drive program Eor S.
Engaging park position P !
If the engine speed is too high or the vehicle
is coasting, do not shift the automatic trans-
mission directly from htok, from ktoh
or directly to j. Otherwise, the automatic
transmission may be damaged.
X Push the DIRECT SELECT lever switch in the
direction of arrow j.
Transmission position display jis shown in
the multifunction display.
When you have engaged park position j, make
sure that the transmission position display
shows jin the multifunction display.
You can only engage park position jwhen the
vehicle is stationary.
Depressing the brake and pushing the DIRECT
SELECT lever up or down disengages the park-
ing lock. The transmission is in neutral i.
At transmission fluid temperatures below
Ò20 †, you can only shift out of park position j
into another transmission position when the
engine is running.
In order to shift from park position jdirectly
into korh:
R depress the brake pedal and
R push the DIRECT SELECT lever up or down
past the first point of resistance
Engaging park position P automatically Park position
jis automatically engaged if:
R you switch off the engine using the key and
remove the key
R you switch off the engine using the key or
using the Start/Stop button and open the
driver's door or front-passenger door
R you open the driver's door when the vehicle is
stationary or when driving at a very low speed and the transmission is in position hork
Under certain conditions, the automatic trans-
mission shifts to transmission position jauto-
matically if the HOLD function or Distance Pilot DISTRONIC is activated. Observe the informa-
tion on the HOLD function (Y page 187) and
Distance Pilot DISTRONIC (Y page 183). Automatic transmission
155Driving and parking Z