engine MERCEDES-BENZ S CLASS 2016 Repair Manual

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 SmartKey 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 164). 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 376).
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
Try to start the engine again.
If the engine still does not start: X
Consult a qualified specialist workshop.
The engine is not running
smoothly and is misfir-
ing. 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 converter
and damage it. X
Have the cause rectified immediately at a qualified specialist work-
shop.
The coolant temperature
gauge 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 356). Observe the warning notes
as you do so and add coolant if necessary. Driving 169
Driving and parking Z

Aut oma tic trans mi ssion
Import ant safety notes
G WARNIN G
If th e engin e spee d is abov e th e idlin g spee d
and you engage transmission position D or R ,
th e vehicl e could pull away suddenly. There is
a ris k of an accident.
When engagin g transmission position D or R ,
always firmly depress th e brak e pedal and do
no t simultaneously accelerate .
G WARNIN G
The automatic transmission switches to neu-
tral position N when you switch off th e engine.
The vehicl e may rol l away. There is a ris k of an
accident.
Afte r switching off th e engine, always switch
to parking position P . Preven t th e parked vehi-
cle from rollin g away by applyin g th e parking
brake.
Observ e th e important safet y note s for PLUG-I N
HYBRID vehicles ( Y
page 42).
DIRECT SELECT lever
Overview of trans mi ssion positions
]
Park position wit h parking loc k
^
Reverse gear
\\
Neutral
[
Drive
The DIRECT SELECT lever is on th e right of th e
steering column . The DIRECT SELECT lever always return s to it s
original position . The curren t transmission posi-
tion P , R , N or D appear s in th e transmission
position display ( Y
page 172) in th e multifunc-
tion display.
Engaging pa rk position P
! If th e engin e spee d is to o high or th e vehicl e
is moving , do no t shif t th e automatic trans -
mission directl y from D to R , from R to D or
directl y to P . The automatic transmission
could otherwise be damaged.
]
Park position wit h parking loc k^
Reverse gear \\
Neutral [
Drive X
Push th e DIRECT SELECT lever in th e direction
of arrow P .
Engaging pa rk position P automaticallyPark position P is automatically engage d if:R
you switch off th e engin e usin g th e SmartKey
and remove th e SmartKey R
you switch off th e engin e usin g th e SmartKey
or usin g th e Start/Sto p butto n and open th e
driver's door or front-passenger door R
th e driver's door is opened when th e vehicl e is
stationary or drivin g at ver y low spee d and th e
transmission is in position D or R
Under certain conditions, th e automatic trans -
mission shifts automatically to transmission
position P if th e HOLD function or DISTRONI C
PLU S is activated. Observ e th e information on
th e HOLD function ( Y
page 209) and on
DISTRONI C PLU S ( Y
page 203).170
Automatic transmission
Driving an d parking

Engaging reverse gear R
! Only shift the automatic transmission to R
when the vehicle is stationary. X
If the transmission is in position D or N : push
the DIRECT SELECT lever up past the first
point of resistance. X
If the transmission is in position P : depress
the brake pedal and push the DIRECT SELECT
lever up past the first point of resistance.
The ECO start/stop function is not available
when reverse gear is engaged. Further informa-
tion on the ECO start/stop function
( Y
page 166).
Shifting to neutral N
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. X
If the transmission is in position D or R : push
the DIRECT SELECT lever up or down to the
first point of resistance. X
If the transmission is in position P : depress
the brake pedal and push the DIRECT SELECT
lever up or down to the first point of resist-
ance.
If you switch the engine off with the transmis-
sion in position R or D , the automatic transmis-
sion shifts to N automatically. With the SmartKey: if you then open the driv-
er's door or the front-passenger door or remove
the SmartKey from the ignition, the automatic
transmission shifts to P automatically.
With the Start/Stop button: if you t hen open
t
he driver's door or the front-passenger door,
the automatic transmission shifts to P automat-
ically.
If you want the automatic transmission to
remain in neutral N , e.g. when having the vehicle
cleaned in an automatic car wash with a towing
system:
Using the SmartKey: X
Switch on the ignition. X
Depress the brake pedal and keep it
depressed. X
Shift to neutral N . X
Release the brake pedal. X
Release the electric parking brake. X
Switch off the ignition and leave the SmartKey
in the ignition lock.
With the Start/Stop button: X
Remove the Start/Stop button from the igni-
tion lock. X
Insert the SmartKey into the ignition lock. X
Switch on the ignition. X
Depress the brake pedal and keep it
depressed. X
Shift to neutral N . X
Release the brake pedal. X
Release the electric parking brake. X
Switch off the ignition and leave the SmartKey
in the ignition lock.
Engaging drive position D X
If the transmission is in position R or N : push
the DIRECT SELECT lever down past the first
point of resistance. X
If the transmission is in position P : depress
the brake pedal and push the DIRECT SELECT
lever down past the first point of resistance.Automatic transmission 171
Driving and parking Z

You can also activate manual drive program M
using the steering wheel paddle shifters
( Y
page 174). In manual drive program M , you
can briefly change gear yourself by using the
steering wheel paddle shifters.
Mercedes-AMG vehicles
C Controlled
Efficiency Comfortable, economical
driving
S Sport Sporty driving style
M Manual Manual gear shifting
Permanent drive program M is only available for
Mercedes-AMG vehicles.
Further information about permanent drive pro-
gram M ( Y
page 175).
You can also activate manual drive program M
using the steering wheel paddle shifters
( Y
page 174). In manual drive program M , you
can briefly change gear yourself by using the
steering wheel paddle shifters.
For further information on the automatic drive
program, see ( Y
page 174).
Steering wheel paddle shifters
You can activate manual drive program M in the
E ( C in AMG vehicles) and S automatic drive
programs using steering wheel paddle shift-
ers C and D ( Y
page 174). In manual drive
program M , you can briefly change gear yourself
by using the steering wheel paddle shifters.
Mercedes-AMG vehicles: you can also activate
manual drive program M with the program
selector button ( Y
page 175). In manual drive
program M , you can permanently change gear
yourself by using the steering wheel paddle
shifters. Automatic drive program
Automatic drive program E Drive program E (drive program C on Mercedes-
AMG vehicles) is characterized by the following: R
comfort-oriented engine settings. R
optimal fuel consumption resulting from the
automatic transmission shifting up sooner. R
the vehicle pulling away more gently in
forward and reverse gears, unless the accel-
erator pedal is depressed fully. R
the vehicle having improved driving stability,
for example on slippery road surfaces. R
the automatic transmission shifting up
sooner. This results in the vehicle being driven
at lower engine speeds and the wheels being
less likely to spin.
Automatic drive program S Drive program S is characterized by the follow-
ing: R
sporty engine settings. R
the vehicle pulling away in first gear. R
the automatic transmission shifting up later.
the fuel consumption possibly being higher as
a result of the later automatic transmission
shift points.
Manual drive program M
General notes In this drive program, you can briefly change
gear yourself by using the steering wheel paddle
shifters. The transmission must be in position D .
You can activate manual drive program M in the
E ( C in Mercedes-AMG vehicles) and S auto-
matic drive programs.
Mercedes-AMG vehicles: as well as temporary
drive program M , you can also activate perma-
nent drive program M . Further information
about permanent drive program M
( Y
page 175).
Activating X
Shift the transmission to position D .X
Pull the left or right steering wheel paddle
shifter ( Y
page 174).
Manual drive program M is temporarily acti-
vated.174
Automatic transmission
Driving and parking

All vehicles (except Mercedes-AMG vehi-
cles: )M and the selected gear appear in the
multifunction display.
Further information on activating manual drive
program M on PLUG-IN HYBRID vehicles
( Y
page 250).
Shifting gears If you pull on the left or right steering wheel
paddle shifter, the automatic transmission
switches to manual drive program M for a limi-
ted amount of time. Depending on which paddle
shifter is pulled, the automatic transmission
immediately shifts into the next gear down or
up, if permitted. X
To shift up: pull the right-hand steering wheel
paddle shifter ( Y
page 174).
The automatic transmission shifts up to the
next gear.
If the maximum engine speed on the currently
engaged gear is reached and you continue to
accelerate, the automatic transmission auto-
matically shifts up in order to prevent engine
damage.
Mercedes-AMG vehicles: the automatic
transmission will not shift up to the next gear
when the engine speed is very low. X
To shift down: pull on the left-hand steering
wheel paddle shifter ( Y
page 174).
The automatic transmission shifts down to
the next gear.
If the engine exceeds the maximum engine
speed when shifting down, the automatic
transmission protects against engine damage
by not shifting down.
Automatic down shifting occurs when coast-
ing.
Shift recommendation The gearshift recommendations assist you in
adopting an economical driving style. The rec-
ommended gear is shown in the multifunction
display. X
Shift to recommended gear D according to
gearshift recommendation C when shown in
the multifunction display of the instrument
cluster.
Deactivating If you have activated manual drive program M , it
will remain active for a certain amount of time.
Under certain conditions the minimum amount
of time is extended, e.g. in the case of lateral
acceleration, during an overrun phase or when
driving on steep terrain.
If manual drive program M has been deactiva-
ted, the automatic transmission shifts into the
automatic drive program that was last selected.
You can also deactivate manual drive program
M yourself: X
Pull on the right-hand steering wheel paddle
shifter and hold it in place ( Y
page 174).
or X
Use the DIRECT SELECT lever to switch the
transmission position.
or X
Use the program selector button to change
the drive program ( Y
page 173).
Manual drive program M is deactivated. The
automatic transmission switches to the pre-
viously activated drive program E (drive pro-
gram C on Mercedes-AMG vehicles) or S .
Manual drive program (Mercedes-
AMG vehicles)
General information In this drive program, you can permanently
change gear yourself by using the steering
wheel paddle shifters. The transmission must be
in position D .
Manual drive program M is different from drive
program S with regard to spontaneity, respon-
siveness and smoothness of gear changes.
As well as this permanent drive program M , you
can also activate temporary drive program
M ( Y
page 174).Automatic transmission 175
Driving and parking Z

Switching on the manual drive program In manual drive program M , you can change gear
using the steering wheel paddle shifters if the
transmission is in position D . You can see the
currently selected drive program and which gear
is engaged in the multifunction display. X
Press the program selector button
( Y
page 173) repeatedly until M appears in
the multifunction display.
Upshifting
! In manual drive program M , the automatic
transmission does not shift up automatically
even when the engine limiting speed for the
current gear is reached. When the engine lim-
iting speed is reached, the fuel supply is cut to
prevent the engine from overrevving. Always
make sure that the engine speed does not
reach the red area of the tachometer. There is
otherwise a risk of engine damage.
C
Gear indicatorD
Upshift indicator
Before the engine speed reaches the red area,
an upshift indicator will be shown in the multi-
function display. X
When message D appears in the multifunc-
tion display, pull on the right-hand steering
wheel paddle shifter.
Downshifting X
Pull the left-hand steering wheel paddle
shifter ( Y
page 174).
The automatic transmission shifts down to
the next gear if this is permissible. Maximum acceleration X
Pull the left-hand steering wheel paddle
shifter until the transmission selects the opti-
mum gear according to the speed.
If you slow down or stop without shifting down,
the automatic transmission automatically shifts
down.
Switching off the manual drive program X
Press the program selector button
( Y
page 173) repeatedly until C or S appears
in the multifunction display.176
Automatic transmission
Driving and parking

Problems with the transmission Problem
Possible causes/consequences and P Solutions
The transmission has
problems shifting gear. The transmission is losing oil. X
Have the transmission checked at a qualified specialist workshop
immediately.
The acceleration ability
is deteriorating.
The transmission no lon-
ger changes gear. The transmission is in emergency mode.
7G-TRONIC: it is only possible to shift into second gear and reverse
gear.
9G-TRONIC: it is only partly possible to engage the gears or the trans-
mission is in position N .X
Stop the vehicle. X
Shift the transmission to position P .X
Switch off the engine. X
Wait at least ten seconds before restarting the engine. X
Shift the transmission to position D or R .
7G-TRONIC: If D is selected, the transmission shifts into second
gear, if R is selected, the transmission shifts into reverse gear. X
Have the transmission checked at a qualified specialist workshop
immediately.
Problems with PLUG-IN HYBRID operation ( Y
page 254).
Transfer case This section is only valid for vehicles with 4-
wheel drive (4MATIC). Power is always trans-
mitted to both axles.
! Performance tests may only be carried out
on a 2-axle dynamometer. The brake system
or transfer case could otherwise be damaged.
Contact a qualified specialist workshop for a
performance test.
! Since ESP ®
engages automatically, the igni-
tion must be switched off (the SmartKey or
Start/Stop button must be in position 0 or 1 )
if: R
the electric parking brake is being tested
on a brake dynamometer R
the vehicle is being towed with only one
axle raised (not permitted for vehicles with
4MATIC).
The brake system could otherwise be dam-
aged. ! Vehicles with 4MATIC must not be towed
with either the front or the rear axle raised, as
doing so will damage the transmission.
Refueling
Important safety notes
G WARNING
Fuel is highly flammable. If you handle fuel
incorrectly, there is a risk of fire and explo-
sion.
You must avoid fire, open flames, creating
sparks and smoking. Switch off the engine
and, if applicable, the auxiliary heating before
refueling.
G WARNING
Fuel is poisonous and hazardous to health.
There is a risk of injury.
You must make sure that fuel does not come
into contact with your skin, eyes or clothing Refueling 177
Driving and parking Z

and that it is not swallowed. Do not inhale fuel
vapors. Keep fuel away from children.
If you or others come into contact with fuel,
observe the following: R
Wash away fuel from skin immediately
using soap and water. R
If fuel comes into contact with your eyes,
immediately rinse them thoroughly with
clean water. Seek medical assistance with-
out delay. R
If fuel is swallowed, seek medical assis-
tance without delay. Do not induce vomit-
ing. R
Immediately change out of clothing which
has come into contact with fuel.
G WARNING
Electrostatic buildup can create sparks and
ignite fuel vapors. There is a risk of fire and
explosion.
Always touch the vehicle body before opening
the fuel filler flap or touching the fuel pump
nozzle. Any existing electrostatic buildup is
thereby discharged.
Do not get into the vehicle again during the refu-
eling process. Otherwise, electrostatic charge
could build up again.
! Do not use diesel to refuel vehicles with a
gasoline engine. Do not switch on the ignition
if you accidentally refuel with the wrong fuel.
Otherwise, the fuel will enter the fuel system.
Even small amounts of the wrong fuel could
result in damage to the fuel system and the
engine. Notify a qualified specialist workshop
and have the fuel tank and fuel lines drained
completely.
! Overfilling the fuel tank could damage the
fuel system.
! Take care not to spill any fuel on painted
surfaces. You could otherwise damage the
paintwork.
! Use a filter when refueling from a fuel can.
Otherwise, the fuel lines and/or injection sys-
tem could be blocked by particles from the
fuel can. If you overfill the fuel tank, fuel could spray out
when the fuel pump nozzle is removed.
For further information on fuel and fuel quality
( Y
page 428).
Refueling
General information Pay attention to the important safety notes
( Y
page 177).
PLUG-IN HYBRID vehicles: pressure in the fuel
tank must be released before refueling.
Except PLUG-IN HYBRID vehicles: if you
unlock/lock the vehicle from the outside, the
fuel filler flap also unlocks/locks.
The position of the fuel filler cap is displayed in
the instrument cluster

X
Press the fuel filler flap in the direction of
arrow C .
The fuel filler flap swings up. X
Turn the fuel filler cap counterclockwise and
remove it. X
Insert the fuel filler cap into the holder on the
inside of the fuel filler flap. X
Completely insert the filler neck of the fuel
pump nozzle into the tank, hook in place and
refuel. X
Only fill the tank until the pump nozzle
switches off.
Do not add any more fuel after the pump stops
filling for the first time. Otherwise, fuel may
leak out.
Opening the fuel filler flap (PLUG-IN
HYBRID vehicles)
X
Pull switch C .
Indicator lamp D flashes and the Please
Wait Depressurizing Tank message
appears in the multifunction display.
If the fuel filler cap is open, indicator lamp D
lights up.
The Tank is Depressurized Ready for
Refueling message appears in the multi-
function display.
Please be sure to observe the information on
refueling on the fuel filler flap.
There is a malfunction if: R
indicator lamp D first flashes and then goes
out R
the yellow engine diagnostics warning lamp
lights up
i From a speed of 2 km/h, the fuel filler cap
can no longer be opened. i The opening process for the fuel filler cap
may take up to 15 minutes.
C
To insert the fuel filler cap D
Tire pressure table

Problems with fuel and the fuel tank Problem
Possible causes/consequences and P Solutions
Fuel is leaking from the
vehicle.
G WARNING
The fuel line or the fuel tank is faulty.
Risk of explosion or fire. X
Apply the electric parking brake. X
Switch off the engine. X
Make sure that the ignition is switched off ( Y
page 162).
or X
When using the SmartKey, turn the SmartKey to position 0 in the
ignition lock and remove it ( Y
page 162).X
Do not restart the engine under any circumstances. X
Consult a qualified specialist workshop.
The fuel filler flap cannot
be opened. The fuel filler flap is not unlocked. X
Unlock the vehicle ( Y
page 79).X
PLUG-IN HYBRID Vehicles: depressurize the fuel tank
( Y
page 178).
The SmartKey battery is discharged or nearly discharged. X
Unlock the vehicle using the mechanical key ( Y
page 81).
The fuel filler flap is unlocked, but the opening mechanism is jammed. X
Consult a qualified specialist workshop.
Charging the high-voltage battery
(PLUG-IN HYBRID vehicles)
Important safety notes
G DANGER
The vehicle's high-voltage electrical system is
under high voltage. If you modify components
in the vehicle's high-voltage electrical system
or touch damaged components, you may be
electrocuted. The components in the vehi-
cle's high-voltage electrical system may be
damaged in an accident, although the damage
is not visible. There is a risk of fatal injury.
Following an accident, do not touch any high-
voltage components and never modify the
vehicle's high-voltage electrical system. Have
the vehicle towed away after an accident and
the vehicle's high-voltage electrical system
checked by a qualified specialist workshop. G WARNING
In the event of a vehicle fire, the internal pres-
sure of the high-voltage battery can exceed a
critical value. In this case flammable gas
escapes through a ventilation valve on the
underbody. The gas can ignite. There is a risk
of injury.
Leave the danger zone immediately. Secure
the danger area at a suitable distance, whilst
observing legal requirements.
G DANGER
If you use incorrectly installed mains sockets
or adapters, extension cables or similar to
connect the charging cable to a mains socket,
this could lead to fires or an electric shock.
There is a risk of fatal injury.180
Charging the high-voltage battery (PLUG-IN HYBRID vehicles)
Driving and parking