engine MERCEDES-BENZ GL 2016 Service Manual

MAX COOL is only operational when the
engine is running. X
To activate: press the

Useful information
i This Operator's Manual describes all
models and all standard and optional equip-
ment of your vehicle available at the time of
publication of the Operator's Manual.
Country-specific differences are possible.
Please note that your vehicle may not be
equipped with all features described. This
also applies to safety-related systems and
functions.
i Read the information on qualified special-
ist workshops ( Y
page 29).
Notes on breaking-in a new vehicle
Important safety notesThe sensor system of some driving and driv-
ing safety systems adjusts automatically
while a certain distance is being driven after
the vehicle has been delivered or after
repairs. Full system effectiveness is not
reached until the end of this teach-in proce-
dure.
New and replaced brake pads and discs only
reach their optimum braking effect after sev-
eral hundred kilometers of driving. Compen-
sate for this by applying greater force to the
brake pedal.
The first 1000 miles (1500 km)
The more you look after the engine when it is
new, the more satisfied you will be with its
performance in the future. R
You should therefore drive at varying vehi-
cle and engine speeds for the first
1000 miles (1500 km). R
Avoid heavy loads, e.g. driving at full throt-
tle, during this period. R
Change gear in good time, before the tach-
ometer needle is

G WARNING
Unsuitable footwear can hinder correct usage
of the pedals, e.g.: R
shoes with thick soles R
shoes with high heels R
slippers
There is a risk of an accident.
Wear suitable footwear to ensure correct
usage of the pedals.
G WARNING
If you switch off the ignition while driving,
safety-relevant functions are only available
with limitations, or not at all. This could affect,
for example, the power steering and the brake
boosting effect. You will require considerably
more effort to steer and brake. There is a risk
of an accident.
Do not switch off the ignition while driving.
G WARNING
If the parking brake has not been fully
released when driving, the parking brake can: R
overheat and cause a fire R
lose its hold function.
There is a risk of fire and an accident. Release
the parking brake fully before driving off.
! Do not warm up the engine with the vehi-
cle stationary. Drive off immediately. Avoid
high engine speeds and driving at full throt-
tle until the engine has reached its operat-
ing temperature.
Only shift the automatic transmission to
the desired drive position when the vehicle
is stationary.
Where possible, avoid spinning the drive
wheels when pulling away on slippery
roads. You could otherwise damage the
drive train.
! Mercedes-AMG vehicles: at low engine
oil temperatures below 68 ‡ (+20 †), the
maximum engine speed is restricted in
order to protect the engine. To protect the engine and maintain smooth engine oper-
ation, avoid driving at full throttle when the
engine is cold.
SmartKey positions
SmartKey
Z
To remove the SmartKey G
Power supply for some consumers, such
as the windshield wipers H
Ignition (power supply for all consumers)
and drive position I
To start the engine
i The SmartKey can be turned in the igni-
tion lock even if it is not the correct Smart-
Key for the vehicle. The ignition is not
switched on. The engine cannot be started.
KEYLESS-GO
General notes
Vehicles with KEYLESS-GO are equipped with
a SmartKey featuring an integrated KEYLESS-
GO function and a detachable Start/Stop but-
ton.
A check which periodically establishes a radio
connection between the vehicle and the
SmartKey determines whether a valid Smart-
Key is in the vehicle. This occurs, for example,
when starting the engine.
When you insert the Start/Stop button into
the ignition lock, the system needs approx-
imately two seconds recognition time. You
can then use the Start/Stop button. Driving 165
Driving and parking Z

Pressing the Start/Stop button several times
in succession corresponds to the different
key positions in the ignition lock. This is only
the case if you are not depressing the brake
pedal.
If you depress the brake pedal and press the
Start/Stop button, the engine starts immedi-
ately.
To start the vehicle without actively using the
SmartKey: R
the Start/Stop button must be inserted in
the ignition lock. R
the SmartKey must be in the vehicle. R
the vehicle must not be locked with the
SmartKey or KEYLESS-GO ( Y
page 83).
Do not keep the SmartKey: R
with electronic devices, e.g. a mobile
phone or another SmartKey. R
with metallic objects, e.g. coins or metal
foil. R
inside metallic objects, e.g. a metal case.
This can impair the functionality of the KEY-
LESS-GO key.
Do not keep the KEYLESS-GO key in the tem-
perature-controlled cup holder ( Y
page 349).
Otherwise, the KEYLESS-GO key will not be
recognized.
If you lock the vehicle with the SmartKey's
remote control or with KEYLESS-GO, after a
short time: R
you will not be able to switch on the ignition
with the Start/Stop button. R
you will not be able to start the engine with
the Start/Stop button until the vehicle is
unlocked again.
If you lock the vehicle centrally using the but-
ton on the front door ( Y
page 91), you can
continue to start the engine with the Start/
Stop button.
The engine can be switched off while the vehi-
cle is in motion by pressing and holding the
Start/Stop button for three seconds. This
function operates independently of the ECO start/stop automatic engine switch-off func-
tion.
Key positions with KEYLESS-GO
C
Start/Stop button D
Ignition lock
As soon as the ignition is switched on, all the
indicator lamps in the instrument cluster light
up. Further information on situations where
an indicator lamp either fails to go out after
starting the engine or lights up while driving
( Y
page 326).
If Start/Stop button C has not yet been
pressed, this corresponds to the key being
removed from the ignition. X
To switch on the power supply: press
Start/Stop button C once.
The power supply is switched on. You can
now activate the windshield wipers, for
example.
The power supply is switched off again if: R
the driver's door is opened and R
you press Start/Stop button C twice when
in this position X
To switch on the ignition: press Start/
Stop button C twice.
The ignition is switched on.
If you press Start/Stop button C once
when in this position, the ignition is deac-
tivated again.
Removing the Start/Stop button
You can remove the Start/Stop button from
the ignition lock and start the vehicle as nor-
mal using the SmartKey.166
Driving
Driving and parking

It is only possible to switch between KEY-
LESS-GO mode and SmartKey operation
when the transmission is in position P .X
Remove Start/Stop button C from ignition
lock D .
You do not have to remove the Start/Stop
button from the ignition lock when you leave
the vehicle. You should, however, always take
the SmartKey with you when leaving the vehi-
cle. As long as the SmartKey is in the vehicle: R
the vehicle can be started using the Start/
Stop button R
the electrically powered equipment can be
operated
Starting the engine
Important safety notes
G WARNING
If children are left unsupervised in the vehicle,
they could: R
open the doors, thus endangering other
people or road users. R
get out and disrupt traffic. R
operate the vehicle's equipment.
Additionally, children could set the vehicle in
motion if, for example, they: R
release the parking brake. R
shifting the automatic transmission out of
park position PR
Start the engine.
There is a risk of an accident and injury.
When leaving the vehicle, always take the
SmartKey with you and lock the vehicle. Never
leave children or animals unattended in the
vehicle. Always keep the SmartKey out of
reach of children.
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.
! Do not depress the accelerator when
starting the engine.
General notes Vehicles with a gasoline engine: the cata-
lytic converter is preheated for up 30 seconds
after a cold start. The sound of the engine may
change during this time.
Automatic transmission X
Shift the transmission to position P
( Y
page 174).
The transmission position display in the
multifunction display shows
P ( Y
page 174).
i You can start the engine in transmission
position P and N .
Starting procedure with the SmartKey X
To start a diesel engine : turn the Smart-
Key to position 2 in the ignition lock
( Y
page 165).
The \( preglow indicator lamp in the
instrument cluster lights up. X
Turn the SmartKey to position 3 in the igni-
tion lock and release it as soon as the
engine is running ( Y
page 165).
i Vehicles with a diesel engine: you can
start the engine without preglow if the
engine is warm. Driving 167
Driving and parking Z

Using KEYLESS-GO to start the engine The Start/Stop button can be used to start
the vehicle without inserting the SmartKey
into the ignition lock. The Start/Stop button
must be inserted in the ignition lock and the
SmartKey must be in the vehicle. This mode
for starting the engine operates independ-
ently of the ECO start/stop automatic engine
start function. X
Depress the brake pedal and keep it
depressed. X
Press the Start/Stop button once
( Y
page 165).
Vehicles with a gasoline engine: the
engine starts.
Vehicles with a diesel engine: preglow is
activated and the engine starts.
Pulling away
General notes
G WARNING
If the engine speed is above the idling speed
and you engage transmission position D or R ,
the vehicle could pull away suddenly. There is
a risk of an accident.
When engaging transmission position D or R ,
always firmly depress the brake pedal and do
not simultaneously accelerate.
Depress the accelerator carefully when pull-
ing away.
The vehicle 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 285).
It is only possible to shift the transmission
from position P to the desired position if you
depress the brake pedal. Only then is the
parking lock released. If you do not depress
the brake pedal, the DIRECT SELECT lever can still be moved but the parking lock remains
engaged.
i Upshifts take place at higher engine
speeds after a cold start. This helps the
catalytic converter to reach its operating
temperature more quickly.
Information on the automatic release of the
electric parking brake ( Y
page 190).
Pulling away with a trailer
To ensure that you do not roll backwards
when pulling away on an uphill slope, engage
the electric parking brake. X
Press and hold handle C .
The electric parking brake continues to
brake and prevent the vehicle from rolling
backwards.
The red I (USA only) or $ (Canada
only) indicator lamp in the instrument clus-
ter remains on. X
Depress the accelerator pedal. X
As soon as the vehicle/trailer combination
is held by the driving force of the engine,
release lever C .
The electric parking brake is released.
The red I (USA only) or $ (Canada
only) indicator lamp in the instrument clus-
ter goes out.
Hill start assist
Hill start assist helps you when pulling away
forwards or in reverse on an uphill gradient. It
holds the vehicle for a short time after you168
Driving
Driving and parking

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 to depress it before the vehicle begins to
roll.
G WARNING
After a short time, hill start assist will no lon-
ger brake your vehicle and it could 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.
Hill start assist is not active if: R
you are pulling away on a level road or on a
downhill gradient. R
the transmission is in position N .R
the electric parking brake is applied. R
ESP ®
is malfunctioning.
ECO start/stop function
Introduction
The ECO start/stop function switches the
engine off automatically if the vehicle is stop-
ped under certain conditions.
The engine starts automatically when the
driver wants to pull away again. The ECO
start/stop function thereby helps you to
reduce the fuel consumption 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
C
ECO start/stop display
The ECO start/stop function is activated
whenever you start the engine using the
SmartKey or the Start/Stop button.
If the engine has been switched off automat-
ically by the ECO start/stop function, the

The HOLD function can also 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.
All vehicles (except Mercedes-AMG vehi-
cles): automatic engine switch-off can take
place a maximum of four times in a row (initial
stop, then three subsequent stops).
Mercedes-AMG vehicles: the number of
consecutive automatic engine switch-offs is
unlimited.
Automatic engine start The engine starts automatically if: R
you switch off the ECO start/stop function
by pressing the ECO button R
in transmission position D or N the brake
pedal is released and the HOLD function is
not active R
you depress the accelerator pedal R
you engage reverse gear RR
you move the transmission out of position
P R
you switch to drive program S or M
(Mercedes-AMG vehicles) R
you switch to an off-road program (except
Mercedes-AMG vehicles) R
you unfasten your seat belt or open the
driver'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-
shield when the air-conditioning system is
switched on R
the battery's condition of charge is too low
Shifting the transmission to position P does
not start the engine. Deactivating or activating the ECO
start/stop function All vehicles (except Mercedes-AMG vehi-
cles) X
To deactivate: press ECO button C .
Indicator lamp D goes out. X
To activate: press ECO button C .
Indicator lamp D lights up.
If the indicator lamp on the ECO button is off,
the ECO start/stop function has been deac-
tivated manually or as the result of a mal-
function.
Mercedes-AMG vehicles
X
To deactivate: in drive program C , press
ECO button C .
or X
Switch to drive program S or M
( Y
page 177).
Indicator lamp D goes out.170
Driving
Driving and parking

Problems with the engine Problem
Possible causes/consequences and P Solutions
The engine does not
start. The starter motor
can be heard. R
There is a malfunction in the engine electronics. R
There is a malfunction in the fuel supply.
Before attempting to start the engine again: X
Turn the key back to position 0 in the ignition lock.
or X
Press the Start/Stop button repeatedly until all indicator lamps
in the instrument cluster go out. X
Try to start the engine again ( Y
page 167). Avoid excessively
long and frequent attempts to start the engine as these will drain
the battery.
If the engine does not start after several attempts: X
Consult a qualified specialist workshop.
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 395).
If the engine does not start despite attempts to jump-start it: X
Consult a qualified specialist workshop.
The starter motor was exposed to a thermal load that was too high. 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.172
Driving
Driving and parking

Problem
Possible causes/consequences and P Solutions
Vehicles with a gaso-
line engine:
The engine is not run-
ning smoothly and is
misfiring. There is a malfunction in the engine electronics or in a mechanical
component of the engine management system. X
Only depress the accelerator pedal slightly.
Otherwise, non-combusted fuel may get into the catalytic con-
verter and damage it. X
Have the cause rectified immediately at a qualified specialist
workshop.
The coolant tempera-
ture gage shows a value
above 248 ‡ (120 †). The coolant level is too low. The coolant is too hot and the engine
is no longer 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 373). Observe the warning
notes as you do so and add coolant if necessary.
Automatic transmission
Important safety notes
G WARNING
If the engine speed is above the idling speed
and you engage transmission position D or R ,
the vehicle could pull away suddenly. There is
a risk of an accident.
When engaging transmission position D or R ,
always firmly depress the brake pedal and do
not simultaneously accelerate.
G WARNING
The automatic transmission switches to neu-
tral position N when 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. DIRECT SELECT lever
Overview of transmission positions
]
Park position with parking lock ^
Reverse gear \\
Neutral [
Drive
The DIRECT SELECT lever is on the right of the
steering column.
The DIRECT SELECT lever always returns to
its original position. The current transmission
position P , R , N or D appears in the transmis-
sion position display in the multifunction dis-
play ( Y
page 174).Automatic transmission 173
Driving and parking Z