MERCEDES-BENZ SLC ROADSTER 2019 Owner's Manual

Key
positions with KEYLESS- GO 0043
Start /S topbut ton
0044 Ignition lock
As soo nas theign ition isswit ched on,all the
ind icat orlamps intheins trumen tclus terligh t
up. Further inform ation onsituati onswher ean
ind icat orlamp either fails togo out afterstart -
ing theen gin eor ligh tsup while driving
(Y page 210).
If St art /S topbut ton0043 has notyet been
pre sse d,this co rrespo ndsto theke ybein g
rem ovedfrom theign ition .
X To swit chon thepower supply:pre ss
St art /S topbut ton0043 once.
The power supplyis swit ched on.You can
no wact ivat eth ewin dsh ield wiper s,for
ex ample .
The power supplyis swit ched off again if:
R thedriv er'sdoor isopen edand
R you pressStart /S topbut ton0043 twice
when inthis posi tion
X To swit chon theignit ion:pressStart /
St op but ton0043 twice.
The ignition isswit ched on.
If you pressStart /S topbut ton0043 once
when inthis posi tion ,th eign ition is
swit ched off again .
Rem oving theSt art/S top button
You canremove theSt art /S topbut tonfrom
th eign ition lockand start theveh icleas nor-
mal usingth eSm artKey.
X Remo veStart /S topbut ton0043 from ignition
loc k0044. You
donothave torem ove theSt art /S topbut -
to nfrom theign ition lockwhen youleaveth e
veh icle. You should, howe ver,always taketh e
Sm artKey withyou when leavingtheveh icle.
As longas theSm artKey isin theveh icle:
R theveh iclecan bestart ed usin gth eSt art /
St op but ton
R theelec trical lypower edequipm entcan be
oper ated St
artin gth eengine
Imp ortant safety notes G
WAR
NING
If ch ildr enare leftuns uper vised intheveh i-
cle ,th ey could:
R oper atetheveh icle's equipm ent
Ad dition ally, childr encould set theveh iclein
mot ionif,for example ,th ey:
R rele ase thepark ingbrak e
R shif tth eauto matictrans mis sion outof
park position005D
R start theen gin e
Ther eis aris kof an acc iden tand injury.
Nev erleav ech ildr enoranim alsunat tend ed
in theveh icle.
When leavingtheveh icle, always taketh e
Sm artKey withyou and lockth eveh icle. This
also applie sfor theDig italVeh icleKey ifth e
"Di gitalVeh icleKey" function isact ivat edvia
Mer cedesme conn ect . G
DANG
ER
Comb ustion engin esemit poisonous
ex haust gasessuc has car bon mon oxide.
In halin gth ese exhaust gasesis haz ardo usto
healt hand canresult inpois oning .Ther eis a
ris kof fat alinj ury. Ther efore, never leav eth e
en gin erun ningan enclo sed spac ewit hout
adequat even tilati on. G
WAR
NING
Flam mable materialsint rod uce dth roug h
en viron men talinfluen ceorby anim alscan Driv
ing
119Drivingand parki ng
Z

ignit
eif in con tactwith theexhaus tsyst em
or part sof the engin ethat heat up.There is
a risk offire.
Carry outregular checkstomake surethat
the reare noflamm ableforeign mate rialsin
the engin ecom partmen tor inthe exhaus t
syst em.
Durin gacold start,the engin eruns athigher
speeds toenable thecatalytic convert erto
reach itsoperat ingtem perat ure.Thesound of
the engin emay chan gedurin gthis time.
Autom atic transm ission X
Depr essthebrak epedal andkeep it
depres sed.
X Shif tthe transm ission toposit ion005D.
Tran smiss ionposit iondisplay 005Disshown
in the multif unction display.
i You
canstartthe engin ein transm ission
posit ion005Dand 005C.
Sta rting procedur ewith theSma rtKey To
star tthe engin eusing theSmar tKey inst ead
of KE YLE SS-GO, pulltheStart/ Stop butt onout
of the ignit ionlock .
X Turn theSmar tKey toposit ion0049
(Y page 118)inthe ignit ionlock andrelease
it as soon asthe engin eis runn ing.
Using KEYLESS-GO tosta rttheengine The
Start/ Stop butt oncan beused tostar tthe
vehic lemanually withoutinse rting the Smar t-
Key intothe ignit ionlock .The Start/ Stop but-
ton must beinse rted inthe ignit ionlock and
the Smar tKey must beinthe vehic le.This
mode forstar tingthe engin eoperat esinde-
pende ntly of the ECO start/sto pautom atic
engin estar tfunc tion.
X Depr essthebrak epedal andkeep it
depres sed.
X Press theStart/ Stop butt ononc e
(Y page 118).
The engin estar ts. Pulling
away
Gener alnotes G
WARN
ING
If the engin espeed isabove theidling speed
and youengag etransm ission position003A
or 0046, thevehic lecould pullaway sud-
denly. Thereisarisk ofan acc ident .
When engagingtransm ission position003A
or 0046, always firmlydepres sthe brak e
pedal anddonot simult aneously accelerat e.
! Change
gearingood timeand avoid spin-
nin gthe wheels. Youcould otherwise dam-
age thevehic le.
Depr esstheaccelerat orcaref ullywhen pulling
away.
The vehic lelock scen trally onceyou have
pulled away.Thelockingknobs inthe doors
drop down.
You canopen thedoors fromthe insid eat any
tim e.
You canalso deact ivatethe autom aticlocking
feat ure (Ypage 178).
It is only possible toshift thetransm ission
fro mposit ion005Dtothe desire dposit ionifyou
depres sthe brak epedal. Onlythenis the shift
lock released .
i Upshif
tstak eplace athigher engine
speeds afteracold start.This helps thecat-
alytic convert erto reach itsoperat ingtem -
perat uremore quickly.
Inf ormat iononthe autom aticrelease ofthe
elect ricpark ingbrak e(Y page 136).
Hill startassist Hill
star tassist helpsyouwhen pulling away
for ward orinreve rseonanuphill gradien t.It
holds thevehic lefor ashor ttim eaft eryou
have removedyour footfromthe brak epedal.
This gives youenoug htim eto move yourfoot
fro mthe brak epedal tothe accelerat orpedal
and todepres sit befor ethe vehic lebegin sto
roll. 120
DrivingDriving
andparking

G
WARNING
After ashort time,hillstart assistwil lno lon-
ger brake yourvehicl eand itcoul droll awa y.
There isarisk ofan accide ntand injury .
There fore,quickly move yourfoot from the
brake pedalto the accele ratorpedal.Never
lea vethe vehicl ewhen itis held byhillstart
assi st.
Hill start assistisnot active if:
R you arepulling awayon aleve lroad oron a
dow nhill gradient
R the transmissi onisin posi tion 005C
R the electric parkingbrake isapp lied
R ESP ®
is malfu nctioning EC
Ostart/stop function
Introduc tion The
ECO start/stop functionswitches the
engine offautomatical lyifthe vehicl eis stop-
ped under certain conditions.
The engine startsautomatica llywhen the
drive rwants topul lawa yaga in.The ECO
start/stop functiontherebyhelpsyou to
redu cethe fuel consumpti onand emiss ionsof
you rvehicl e.
Important safetynotes G
WARNING
If the engine isswi tched offautomatica lly
and youexit thevehicl e,the engine is
restarted automatical ly.The vehicl emay
begi nmoving. Thereisarisk ofaccide ntand
injury .
If you wishto exit thevehicl e,alw aysturn
off the ignitio nand secure thevehicl e
aga inst rolling awa y. Gene
ralnote s 0043
ECO start/stop display
The ECO start/stop functionisactiva ted
whene veryou switch onthe engine using the
SmartKey orthe Start/Stop button.
If the engine hasbeen switched offautomati-
call yby the ECO start/stop function,the00D6
ECO symb olisshow nin the multi function dis-
pla y.
Automatic engineswitch-off If
the vehicl eis braked toastandstil lwith the
transmissi onin005B or005C, theECO start/stop
function switches offthe engine automatical ly.
The ECO start/stop functionisopera tional
when:
R the indica torlamp inthe ECO button islit
green
R the outsi detempera tureiswithi nthe range
that issui table forthe system
R the engine isat normal operatingtempera -
ture
R the settempera tureforthe vehicl einterior
has been reache d
R the battery issuffi ciently charged
R the system detects thatthewinds hieldis
not fogged upwhen theair-condi tioningsys-
tem isswi tched on
R the hood isclosed
R the drive r'sdoor isclosed andthedrive r's
seat beltis fastened
All ofthe vehicl e'ssystems remainactive
when theengine isstoppe dau tomatical ly.
Automatic engineswitch-off cantake placea
maximu mof four times inarow (initi alstop,
then three subsequ entstops).
The HOLD function canbeactiva tedifthe
engine hasbeen switched offautomatical ly.It
is then notnecessa ryto continue applying the
brakes duringthe automatic stopphase.When
you depre ssthe accele ratorpedal,the engine Drivi
ng
121Drivi ngand parking Z

starts
automatically andthebraking effectof
the HOLD function isdeactivated.
Automatic enginestart The
engine startsautomatically if:
R you switch offthe ECO start/st opfunction
by pressing theECO button
R you release thebrake pedalintransmission
position 005Bor005C and theHOLD function is
not active
R you depress theaccelerator pedal
R you engage reverse gear005E
R you move thetransmission outofposition
005D
R you switch todrive program S+
R you unfasten yourseatbeltoropen thedriv-
er's door
R the vehicle startstoroll
R the brake system requires this
R the temperature inthe vehicle interior devi-
ates from thesetrange
R the system detects moisture onthe wind-
shield whentheair-conditioning systemis
switched on
R the battery's condition ofcharge istoo low Shifting
thetransmission toposition 005Ddoes
not start theengine.
Deac tivating oractivating theECO
start /stop function X
To deactivate: pressECObutton 0043.
Indicator lamp0044goes out.
X To activate: pressECObutton 0043.
Indicator lamp0044lights up.
If indicator lamp0044isoff, theECO start/st op
function hasbeen deactivated manuallyor as
the result ofamalfunction. Theengine will
then notbeswitched offautomaticall ywhen
the vehicle stops. 122
DrivingDriving
andparking

Problems
withtheengine Problem
Possible
causes/co nsequences and0050 0050
Solutions The
engine doesnot
start. The
HOLD functionorAct ive Distanc eAssist DISTRONIC isactiva-
ted.
X Deactivat ethe HOLD function(Ypage 151)orAct ive Distanc e
Assist DISTRONIC (Ypage 149).
X Try tostart theengine again. The
engine doesnot
start. Thestarter motor
can beheard. R
There isamalfunction inthe engine electron ics.
R There isamalfunction inthe fuel supply .
Before attempt ingtostart theengine again:
X Turn theSmartK eyback toposition 0092inthe ignition lock.
or X Press theStart /Stopbutton repeatedly untilallindicator lampsin
the instrumen tcluster goout.
X Try tostart theengine again(Ypage 119). Avoid excessively long
and frequent attemptsto start theengine asthese willdrain the
battery.
If the engine doesnotstart after several attempt s:
X Consult aquali fiedspecialist workshop. The
engine doesnot
start. Youcannot hear
the starter motor. The
on-board voltageistoo low because thebattery istoo weak or
discharged.
X Jump-start thevehicle (Ypage 260).
If the engine doesnotstart despite attemptsto jump-st artit:
X Consult aquali fiedspecialist workshop. The
starter motorwasexposed toathermal loadthatwastoohigh.
X Allow thestarter motortocool down forapproximately two
minutes.
X Try tostart theengine again.
If the engine stilldoes notstart:
X Consult aquali fiedspecialist workshop. The
engine isnot run-
ning smoothly andis
misfiring. There
isamalfunction inthe engine electron icsorinamechanical
componen tof the engine management system.
X Only depress theaccelerator pedalslightly.
Otherwise, non-combusted fuelmay getinto thecatalytic con-
verter anddamage it.
X Have thecause rectified immediately ataquali fiedspecialist
workshop. Driving
123Drivingandparking Z

Problem
Possible
causes/co nsequences and0050 0050
Solutions The
coolant tempera-
ture display showsa
value above 248‡
(120 †).The coolant
warning lampmayalso
be on and awarning
tone maysound. The
coolant levelistoo low. Thecoolant istoo hotand theengine is
no longer beingcooled sufficiently.
X Stop assoon aspossible andallow theengine andthecoolant to
cool down.
X Check thecoolant level(Ypage 242). Observe thewarning notes
as you dosoand add coolant ifnecessary. If
the coolant leveliscorrect ,the engine radiator fanmay befaulty.
The coolant istoo hotand theengine isno longer beingcooled suf-
ficiently.
X At coolant temperatures below248‡(120 †),drive tothe near-
est quali fiedspecialist workshop.
X Avoid heavy loadsonthe engine asyou doso, e.g. driving in
mountainous terrainandstop-and- gotraffic. Notes
ontowing vehicles
The vehicle isnot suitable forattaching tow
bar systems, suchasthose usedforflat tow-
ing ordinghy towing.
Att aching orusing towbarsystems mayresult
in damage tothe vehicle.
When towing avehicle withtowbarsystems,
safe driving characterist icscannot beguaran-
teed forthe towing vehicle orthe towed vehi-
cle.
The vehicle/vehicle combinationmayswerve.
Observe thepermissible towingmethods
(Y page 264)andthenotes ontowing with
both axles onthe ground (Ypage 264). DYNAMIC
SELECTbutt on
Use theDYNAMIC SELECTbutton tochange
the drive program. Depending onthe drive pro-
gram selected thefollowing vehiclecharacter-
istics willchange:
R the drive (engine andtransmission manage-
ment)
R the suspension orthe adaptive adjustable
damping onlyonvehicles withAMG RIDE
CONTROL sportssuspension
R the sound ofthe exhaust system(vehicles
with sports exhaust system)
R the steering
R the availa bilityofthe ECO start/ stopfunc-
tion Each
timeyoustart theengine withtheSmart-
Key orthe Start /Stopbutton, driveprogram C
is activated. Forfurther information about
startin gthe engine, see(Ypage 119). X
Press DYNAMIC SELECTbutton 0043asmany
times asnecessary untilthedesired drive
program isselected.
The selected driveprogram appearsinthe
multifunct iondisplay .Aft erashort period of
time, thedisplay goesoutand thesymbol
for the selected driveprogram appears.
In addition, thecurrent driveprogram set-
tings aredisplay edbriefly inthe multimedia
system display.
i In
afew countr ies,theECO start/ stop
funct ionisdeactivated atthe factory dueto
the availa blefuel grade. Inthis case, the
ECO start/ stopfunct ionisnot availa blein
any drive program, regardless ofthe display
in the multimedia systemdisplay.
In city traffic andstop-st arttraffic, drivepro-
gram Cis recommen ded. 124
DY
NAMIC SELECTbutt onDriving andparking

Avai
labledr ive progr ams: C
Comf ort Comf
ortable andeconomi-
cal driv ingcharac teris tic s S
Spo rt Spo
rty driv ingcharac teris -
tic s S+
Spo rtPlus Part
icular lyspor tydriv ing
ch arac teris tic s I
In divi dual In
divi dual settings E
Ec on omy Part
icular lyeco nomic al
driv ingcharac teris tic s Ad
dition alinf orm ationfor driv epro gram s
(Y page 128). Aut
oma tictrans mission Imp
ortant safety notes G
WAR
NING
If th een gin espee dis abov eth eidlin gspee d
and youengage trans mis sion position003A
or 0046, theveh icle could pull away sud-
den ly.Ther eis aris kof an acc iden t.
When engagin gtrans mis sion position003A
or 0046, always firmly depr essthebrak e
pedal anddonotsim ultan eousl yacc eler ate. G
WAR
NING
The auto matictrans mis sion switches toneu-
tr al posi tionN when youswitchoff the
en gin e.The vehicle may rollaway. Thereis a
ris kof an acc iden t.
Af terswit ching offtheen gin e,always switch
to park ingposi tionP. Pre ven tth epark ed
veh icle from rolling away byapplyin gth e
park ingbrak e. Select
orlever
Over view oftrans mission positions !
If
th een gin espee dis toohigh ortheveh i-
cle isin mot ion,do notshif tth eauto matic
tr ans mis sion directly from 005Bto005E, from
005E to005B ordire ctly to 005D. Do
notopen thedriv er'sdoor while theveh i-
cle isin mot ion.At low spee dsintrans mis -
sion position005B or005E, other wise parkposi-
tio n005D isen gaged automaticall y.
The trans mis sion could bedamag ed. 005D
Park position
005E Rever segear
005C Neut ral
005B Drive
The selector leve ralways return sto its orig inal
posi tion.The curren ttr ans mis sion position005D,
005E, 005Cor005B issho wninthetrans mis sion
posi tiondispl ayinthemult ifunction displ ay.
Tr ans mission position and drive pro-
gr am displa y All
vehi cles (excep tfor Mer cedes -AMG
SLC 43) 0043
Tran smissio nposi tion
0044 Gear
0087 Drive program
The curren ttr ans mis sion positionand drive
pro gram appear inthemult ifunction displ ay. Aut
oma tictrans mission
125Drivingand parking Z

Merce
des-AMGSLC 43 0043
Transmi ssionposition
0044 Drive progra m
The current transmissi onposi tion anddrive
progra mapp ear inthe multi function display.
Eng aging parkpositi onP X
When thevehicl eis stationa ry,depre ssthe
brake pedal.
X Press button 0043.
Eng aging parkpositi onPautomati-
call y Park
position 005Disau tomatical lyengag edif:
R you switch offthe engine using the Smart-
Key and remove theSmartKey
R you switch offthe engine using the Smart-
Key orusi ng the Start/Stop buttonand
open thedrive r'sdoor orfront-passenge r
door
R you open thedrive r'sdoor when thevehicl e
is stationa ryor when drivingatavery low
spee dand thetransmissi onisin posi tion 005B
or 005E
Under certain conditions, theautomatic trans-
missi onshifts automatical lyto transmissi on
posi tion 005Difthe HOLD function orActive Dis-
tance Assist DISTRONIC isactiva ted.Observe
the informati onon the HOLD function (Y
pag e152) andonActive Distance Assist
DISTRONIC (Ypag e147).
Eng aging reverse gearR !
Only
move theautomatic transmissi onto
005E when thevehicl eis stationa ry.
X Depress thebrake andkeep itpresse d.
X Push thesele ctor lever forwa rdspast the
first point ofresis tance.
The ECO start/stop functionisnot available
when reverse gearis engag ed.Further infor-
mation onthe ECO start/stop function
(Y pag e121) .
Shiftin gto neutral N G
WARNING
If child renareleft unsu pervi sedinthe vehi-
cle, they could:
R opera tethe vehicl e'sequ ipme nt
Additio nally,child rencoul dset the vehicl ein
motion if,for exampl e,they:
R relea sethe parking brake
R shift theautomatic transmissi onout of
park position 005D
R start theengine
There isarisk ofan accide ntand injury .
Never leavechild renoranima lsunattended
in the vehicl e.
When leaving thevehicl e,alw aystake the
SmartKey withyouand lock thevehicl e.This
als oapp liesfor the Digita lVehicl eKey ifthe
"Digi talVehicl eKey" function isactiva tedvia
Mercede sme connect.
X When thevehicl eis stationa ry,depre ssthe
brake pedal.
X Push thesele ctor lever forwa rdsorback to
the first point ofresis tance.
If you switch the engine offwith thetransmis-
sion inposi tion 005Eor005B, theautomatic trans-
missi onshifts to005C automatical ly.
With theSmartKey: ifyou then open thedriv-
er's door orthe front-passenge rdoor or
remove theSmartKey fromtheignitio n,the
au tomatic transmissi onshifts to005D automati-
call y. 126
Automatic
transmissio nDrivingand parking

With
KEYLESS-GO :if you then open thedriv-
er's orfront-passenge rdoor, theautomatic
transmissi onshifts to005D automatical ly.
If you want theautomatic transmissi onto
remai nin neutral 005C,e.g. when havingthe
vehicl eclea ned inan automatic carwas hwith
a towing system:
X Vehic leswith KEYLESS-GO :remove the
Start/Stop buttonfromtheignitio nlock.
X Insert theSmartKey intotheignitio nlock.
X All vehi cles:swi tch the ignitio non.
X Depress thebrake pedaland keep it
depre ssed.
X Shift toneutral 005C.
X Rel ease thebrake pedal.
X Rel ease theelectric parkingbrake.
X Switch offthe ignitio nand leavethe Smart-
Key inthe ignitio nlock.
Eng agin gdrive position D X
When thevehicl eis stationa ry,depre ssthe
brake pedal.
X Push thesele ctor leverback pastthefirst
point ofresis tance. Transmissio
npositi ons 0045 Park
positi on
This prevents thevehicl efrom roll-
ing awa ywhen stoppe d.
Only shiftthetransmissi oninto
posi tion 0045 (Ypag e125) when
the vehicl eis stationa ry.The park-
ing lock shou ldnot beused asa
brake whenparking.Alwa ysapp ly
the electronic parkingbrake inadd i-
tion tothe parki nglock inorder to
secure thevehicl e.
If the SmartKey isremoved fromthe
ignitio nlock, thetransmissi onis
locked.
The automatic transmissi onshifts
to 0045 automatical ly:
R when theSmartKey isremoved
from theignitio nlock
R when theengine isswi tched off
with thetransmissi oninposi tion
0046 or003A andone ofthe
doors isopened
In the event ofamalfu nction ofthe
vehicl e'selectronics, thetransmis-
sion may lockinposi tion 0045.
Have thevehicl eelectronics
checked immediatelyat aqua lified
speci alist worksho p. 0046 Reverse
gear
Only shiftthetransmissi oninto
posi tion 0046 when thevehicl eis
stationa ry. Automatic
transmissio n
127Drivi ngand parking Z

0044 Neut
ral
Do not shiftthe transmi ssion to
0044 while dri ving .The automa tic
tra nsmi ssion cou ldothe rwise be
da ma ged.
No powe ris tra nsmi ttedfromthe
eng inetothe drive wheels.
Re leas ing the brakepedalwi llal lo w
yo uto mov ethe vehiclefre ely, e.g .
to push itor tow it.
If ESP ®
is de acti vated orfaulty: shift
the transmi ssion topositio n0044 if
the vehicleis in da nge rof ski dding ,
e.g .on icy roads.
! Co
asting inneu tral005C may
cau sedama getothe drive train. 003A Dri
ve
The automa tictransmi ssion
cha nge sge ar automa tically. All
for wa rdgearsar eav ailabl e. Dri
ving tips
Ch ang ingge ar The
automa tictransmi ssion shifts thro ughthe
ind ividu alge arsau toma tically wh en itis in
tra nsmi ssion positio n005B. Thisau toma ticgear
shi fting behavio ris de term inedby :
R the selecte ddri ve pro gram
R the positio nof the acce lera tor pedal
R the roadspe ed
Ac celerator pedalpos ition Yo
ur sty leof dri ving influences howtheauto-
ma tic transmi ssion shifts gear:
R little thro ttle:ea rly upshi fts
R mor ethro ttle:la te upshi fts Ki
ck dow n Use
kickd ownfor maxim um accelera tion.
X Dep ressthe accelera tor pedalbe yond the
pre ssu repoint.
The automa tictransmi ssion shifts toalowe r
ge ar dependi ng on the enginespeed.
X Eas eoff the accelera tor pedalonce the
de sired speedisrea che d.
The automa tictransmi ssion shifts back up. Dri
veprog rams
Dri veprog ramC(C omfo rt) In
city trafficand stop -starttra ffic, dri ve pro -
gra mCis reco mme nded.
Driv epro gramCis cha racteri zedbythe follow-
ing :
R the vehiclede liver scomf ortable, eco nomi cal
ha ndl ing characteri stics.
R the vehiclepu lls aw ay mor ege ntly in
for wa rdand revers ege ars, unl ess theaccel-
era tor pedalis de pre sse dfu lly.
R the vehicleha simp roveddriving stability,
for exa mpl eon slip pe ry roa dsu rfa ces .
R op tima lfu el cons umption resulting fromthe
au toma tictransmi ssion shifting upsoo ner.
The vehicleis dri ven inthe low eng inespee d
ra nge and thewheelsareless likel yto spin.
R the suspe nsion exh ibits comf ortable da mp-
ing setti ngs(ada pti ve dampi ngsystem only
in veh icles with AMG RIDE CONTR OLsports
su spe nsion) .
R the stee ring exhibits comf ortable stee ring
cha racteri stics.
Dri veprog ramS(S port) Driv
epro gramSis cha racteri zedbythe follow-
ing :
R the vehicleexh ibits spo rtydriving character-
is tics .
R the vehiclepu lls aw ay infirst gear.
R the automa tictransmi ssion shifts uplater.
The fuel cons umption possi blybe ing highe r
as ares ultof the later automa tictransmi s-
si on shiftpo ints . 12
8 Au
tomati ctrans missionDr ivi ng andparki ng