ECU MERCEDES-BENZ G-Class 2017 W463 Service Manual

Display messagesPossible causes/consequences andMSolutions
?
CoolantToo HotStopVehicl eTurnEngine Off
The coolan tistoohot .
Aw arning tone also sounds.
GWARNIN G
Do no tdrive when your engin eisoverheated. This can caus esom e
fluids whic hmay hav eleaked int othe engin ecom partmen ttocatch
fire.
Steam from th eoverheate denginec an also caus eserious burn swhich
can occur jus tbyopening th ehood.
There is ariskofi njury.
XPull ove rand stop th evehicl esafely and switch off th eengine, pay-
ing attention to roa dand traffic conditions.
XSecur ethe vehicl eagainst rollin gaway (Ypage 120).
XLeav ethe vehicl eand keep asafed istanc efromt hevehicl euntil th e
engin ehas cooled down .
XMakesuret hatthe air supply to th eenginer adiato risnotblocked,
e.g. by snow, slus horice.
XDo no tstart th eenginea gain until th edisplay message goe sout and
th ec oolan ttem perature is belo w
Otherwise,the
engin ecould be damaged.
XPay attention to th ecoolan ttem perature gauge .
XIf thetem perature increases again ,visit aqualified specialist work-
sho pimmediately.
Under normal operating condition sand wit hthe specified coolan t
level, th ecoolan ttem perature may ris eto
The poly-V-belt may hav etorn.
XPull ove rand stop th evehicl esafely and switch off th eengine, pay-
ing attention to roa dand traffic conditions.
XChec kthe poly-V-belt .
If th epoly-V-belt is torn:
!Do no tcontinue driving. The engin ecould otherwise overheat.
XConsult aqualified specialist workshop .
If th epoly-V-belt is not damaged :
XWait until thedisplay message disappear sbefore restarting th e
engine. Otherwise ,the engin ecould be damaged.
XPay attention to th ecoolan ttem perature gauge .
XVisitaqualified specialist workshop .
Display messages177
On-boardc omputer andd isplays
Z
the marking
H
the marking
H.
.

Display messagesPossible causes/consequences andMSolutions
4
Engine Oil LevelCannot Be Measured
The measuringsystem is malfunctioning .
XVisitaqualified specialist workshop .
8
FuelLevel Low
The fuel level has dropped int othe reserv erange.
XRefue lattheneares tgas station .
CThere is only averys mall amount of fuel in th efuel tank.
XRefue lattheneares tgas station without fail .
8
Gas Cap Loose
The fuel system pressur eistoolow. The fuel filler cap is no tclosed
correctl yorthefuel system is leaking .
XCheckthatthe fuel filler cap is correctl yclosed .
If th efuelfiller cap is not correctl yclosed :
XClosethe fuel filler cap .
If th efuelfiller cap is correctl yclosed :
XVisitaqualified specialist workshop .
Driving systems
Display messagesPossible causes/consequences and MSolutions
TCShiftConditionsNot Fulfilled
ApplyBrake/Parkin gBrake
The parking brak ehas no tbeen applie dand th ebrak epedal has no t
been depressed. The transfer cas ehas canceled th egear chang e
process and is in Neutral.There is no connection between th eengine
and th edrive wheels.
XPull ove rand stop th evehicl esafely as soo naspossible, payin g
attention to roa dand traffic conditions.
XDepress th ebrak epedal and apply th eparking brake.
XShift th eautomatic transmission to neutral position N.
XMak esurea ll condition sfor changing gear sare met (Ypage 146).
XRepeat th egearshift process.
TC Malfunction
VisitWorkshopAppl yParkingBrake toPark
There is amalfunction in th etransfer case.
XDo no tshift th etransfer case.
XWhe nparking ,secure th evehicl eagainst rollin gaway (Ypage 120).
XHavethe vehicl echecked ataq ualified specialist workshop .
TC Shift Canceled
Please Reactivate
The transfer casehas no tperformed th egear chang eprocess.
XRepeat th egearshift process.
XMak esurea ll condition sfor changing gear sare met (Ypage 146).
TCshiftcondition snot fulfilled
Max.Speed 25 mph
You hav eexcee ded th emaximum speed for th egearshift process.
XDrive mor eslowly.
XRepeat th egearshift process.
Display messages179
On-boardc omputer andd isplays
Z

Display messagesPossible causes/consequences andMSolutions
TCShiftConditionsNot Fulfilled
Select NEUTRA LGear
You hav enotmet on eormores hift conditions.
XShift th eautomatic transmission to neutral position N.
XRepeat th egearshift process.
TCShiftCondition sNot Fulfilled
Max.Speed 40 mph
You hav eexcee ded th emaximum speed for th egearshift process.
XDrive mor eslowly.
XRepeat th egearshift process.
LOW RANGE
On
The transfer cas eisintheLOW RANGE off-road position .
HIGHRANGE
On
The transfer cas eisintheHIG HRANGE on-road position .
Differential LocksAvailable OnlyInLOW RANGE
The LOW RANGE butto nhas been pressed. The transfer cas eisinoff-
roa ddrivin gposition LOW RANGE andadifferential loc kisengaged.
XDisengage th edifferential loc k(Ypage 120).
XRepeat thegearshift process.
TC NEUTRA L
On
The transfer cas eisintheNeutral neutral position .
Aw arning tone will also soun dwhen th edriver's door is opened and
th eb rak epedal is no tdepressed.
XClos ethe driver's door .
XSecurethe vehicl eagainst rollin gaway (Ypage 120).
XShift th etransfer cas eaccording to drivin gconditi ons
(Ypage 145).
Differential Loc kPreselected
ESP Not Available
Adifferential loc kwas engaged. The differential gear system has no t
yet locke dthe respective differential. The activation indicator lamp
(yellow) (
Ypage 120) of th eswitch lights up.
ES P®is unavailable .
AB Siss till available.
Differential LocksActive
ABS and ESP NotAvailable
Ad ifferential loc kwas engage dand th edifferential gear system has
no tyet locke dthe respective differential. The yello wactivation indi-
cator lamp and red function indicator lamp (
Ypage 120) on theswitch
lights up.
AB Sa nd ES P
®are unavailable .
180Display messages
On-boardcomputer andd isplays

Tires
Display messagesPossible causes/consequencesand MSolutions
Tirep ressure willbe displayed afterdrivingaf ewminutes
The tire pressure monitor is measurin gthe tire pressure.
XDriv eon.
The tire pressures appear in the multifunctio ndisplay after yo uhave
been drivin gfor afew minutes.
TirePress.MonitorInoperativeThe tire pressure monitor is faulty.
XVisitaq ualified specialis tworkshop.
TireP ressure Moni‐tor Inoperative NoWheel Sensors
The wheels mounted do not have asuitabl etire pressure sensor .The
tire pressure monitor is deactivated.
XMount wheels with suitabl etire pressure sensors.
The tire pressure monitor is activated automaticall yafter drivin gfor
af ew minutes.
Check TiresThe tire pressure in one or mor etiresh asdropped significantly. The
whee lposit ioni ss hown in the multifunctio ndisplay .
Aw arning tone also sounds.
GWARNING
Tire pressures thata retoo lo wposet he following hazards:
Rtheym ayburst, especially as the load and vehicl espeed increase.
Rtheym aywear excessivel yand/or unevenly, which mayg reatly
impai rtire traction.
Rthe drivin gcharacteristics, as well as steerin gand braking ,maybe
greatl yimpaired
There is ariskofana ccident.
XStop the vehicl ewithou tmaking any sudden steerin gorbraking
maneuvers. Pa yattentio ntothe trafficc onditions as yo udoso.
XSecure the vehicl eagain st rolling away (Ypage 120).
XIf there is aflatt ire ,inspect the tire s(Ypage 240).
XCheck the tire pressure (Ypage 257).
XIf necessary,correct the tire pressure.
Displaymessages183
On-boardc omputer andd isplays
Z

Display messagesPossible causes/consequences andMSolutions
WarningTireM al‐functionThe tire pressur einoneor mor etires has dropped suddenly. The whee l
position is shown in th emultifunction display.
Aw arning tone also sounds.
GWARNIN G
Drivin gwithaf lat tire poses ariskoft hefollowin ghazards :
Raflat tire affects th eabilit ytos teer or brak ethe vehicl e
Ryou could lose control of th evehicl e
Rcontinued drivin gwithaf lat tire will caus eexces sive heat build-up
and possibl yafire
There is ariskofana ccident.
XStop thevehicl ewithout making any sudden steering or braking
maneuvers .Pay attention to th etraffic condition sasyou do so.
XSecur ethe vehicl eagainst rollin gaway (Ypage 120).
XIf there is aflat tire, inspec tthe tires (Ypage 240).
PleaseCorrec tTirePressureThe tire pressur eistoolow in at least on eofthetires ,ort hetire
pressur edifference between th ewheels is to ogreat.
XChec kthe tire pressures at th enexto pportunity (Ypage 257).
XIf necessary, correc tthe tire pressure.
XRestart th etirep ressur emonitor (Ypage 259).
TirePress .Sen‐sor(s) Missin gThere is no signal from th etirep ressur esensor of on eorseveral
wheels. The pressur eoftheaffecte dtired oes no tappear in th emul-
tifunction display.
XHav ethe fault ytirep ressur esensor replace dataqualified special -
ist workshop .
TirePress.Monito rCurrently Unavaila‐ble
Becausethere is interferenc efromas tron gs ource of radi owaves, no
signals from th etirep ressur esensor sare detected. The tire pressur e
monitor is temporarily malfunctioning .
XDrive on.
The tire pressur emonitor restarts automatically as soo nasthe
problem has been resolved.
184Display messages
On-boardc omputer andd isplays

Display messagesPossible causes/consequences andMSolutions
h
TirePressure Warn‐ing,TireM alfunc‐tion
The tire pressur einoneor mor etires has dropped suddenly. The whee l
position is shown on th emultifunction display.
Aw arning tone also sounds.
GWARNIN G
Drivin gwithaf lat tire poses ariskoft hefollowin ghazards :
Raflat tire affects th eabilit ytos teer or brak ethe vehicl e
Ryou could lose control of th evehicl e
Rcontinued drivin gwithaf lat tire will caus eexces sive heat build-up
and possibl yafire
There is ariskofana ccident.
XStop thevehicl ewithout making any sudden steering or braking
maneuvers .Pay attention to th etraffic condition sasyou do so.
XSecur ethe vehicl eagainst rollin gaway (Ypage 120).
XIf there is aflat tire, inspec tthe tires (Ypage 240).
h
Check Tir ePressure
The tire pressur einoneor mor etires has dropped significantly. The
whee lposition is shown on th emultifunction display.
Aw arning tone also sounds.
GWARNIN G
Tir ep ressures that are to olow pos ethe followin ghazards :
Rthey may burst, especially as th eload and vehicl espeed increase.
Rthey may wear excessivel yand/o runevenly, whic hmay greatl y
impair tire traction .
Rthed rivin gcharacteristics ,aswell as steering and braking ,may be
greatl yimpaire d
There is ariskofana ccident.
XStop thevehicl ewithout making any sudden steering or braking
maneuvers .Pay attention to th etraffic condition sasyou do so.
XSecur ethe vehicl eagainst rollin gaway (Ypage 120).
XIf there is aflat tire, inspec tthe tires (Ypage 240).
XChec kthe tire pressur e(Ypage 257).
XIf necessary, correc tthe tire pressure.
h
PleaseCorrec tTirePressure
The tire pressur eistoolow in at least on eofthetires ,ort hetire
pressur edifference between th ewheels is to ogreat.
XChec kthe tire pressures at th enexto pportunity (Ypage 257).
XIf necessary, correc tthe tire pressure.
Display messages185
On-boardc omputer andd isplays
Z

Vehicle
Display messagesPossiblecauses/consequences and MSolutions
Shiftto'P'or'N'to Start EngineYouh avea ttempte dtostart the engine with the transmission in posi-
tion Ror D.
XShift the transmission to position Por N.
Auxiliary BatteryMalfunctionThe auxiliary battery for the automatic transmission is no longer being
charged.
XVisit aquali fied specialist workshop at the next opportunity.
XUntil then, set the automatic transmission to position Pbefore you
switch off the engine.
XBefore leaving the vehicle, appl ythe parking brake.
Apply Brake toShift from' P'Youh avea ttempte dtomove the transmission selecto rlev er to posi-
tion D,R or Nwithou tdepressing the brake pedal.
XDepres sthe brake pedal.
Apply Brake toSelect RYo uh avea ttempte dtoshift from position Dto position Rwithout
applying the brake.
XDepres sthe brake pedal.
XShift the transmission to position R.
AThe reardooriso pen.
GWARNING
Whe nthe engine is running ,exhaus tgases can enter the vehicl einte-
rio rift he tailgate is open.
There is ariskofp oisoning .
XClose the reard oor.
?The hoo disopen.
GWARNING
The open hoo dmay block your vie wwhent he vehicl eisinmotion.
There is ariskofana ccident.
XPull overa nd stop the vehicl esafelyass oonaspossible, paying
attentio ntoroada nd traffic conditions.
XSecure the vehicl eagain st rolling away (Ypage 120).
XClose the hood.
CAt leas tone door is open.
Aw arning tone also sounds.
XClose al lthe doors.
186Display messages
On-board computer and displays

Safety
Seat belts
Warning/
indicator
lampNSignal type
Possible causes/consequences and M
Solutions
üNAfter startin gthe engine, the red seat belt warning lamp lights up for 6seconds.
The seat belt warning lamp reminds the driver and front passenger to fasten their
seat belts.
XFasten your seat belt (Ypage 41).
üN After startin gthe engine, the red seat belt warning lamp lights up. In addition, a
warning tone sounds for up to 6seconds.
The driver's seat belt is not fastened.
XFasten your seat belt (Ypage 41).
The warning tone ceases.
üN The red seat belt warning lamp lights up after the engine starts, as soon as the
driver's or the front-passenger door is closed.
The driver or front passenger has not fastened their seat belt.
XFasten your seat belt (Ypage 41).
The warning lamp goes out.
There are object sonthe front-passenger seat.
XRemove the object sfrom the front-passenger seat and stow them in asecure
place.
The warning lamp goes out.
üN The red seat belt warning lamp flashes and an intermittenta udible warning
sounds.
The driver or front passenger has not fastened their seat belt. The vehicle is being driven faster than 15 mph (25 km/h) or has briefly been driven faster than 15 mph
(25 km/h).
XFasten your seat belt (Ypage 41).
The warning lamp goes out and the intermittentw arning tone ceases.
There are object sonthe front-passenger seat. The vehicle is being driven faster
than 15 mph (25 km/h )orhas briefly been driven faster than 15 mph (25 km/h).
XRemove the object sfrom the front-passenger seat and stow them in asecure
place.
The warning lamp goes out and the intermittentw arning tone ceases.
188Warning and indicator lampsinthe instrument cluster
On-board computer and displays

Safety systems
Warning/
indicator
lampNSignal type
Possible causes/consequences and M
Solutions
JNCanada only: the red brake system warning lamp is on while the engine is
running.
Aw arning tone also sounds.
GWARNING
The brake system is malfunctioning and the braking characteristics may be affec-
ted.
There is arisk of an accident.
XIf the multifunction display shows adisplay message, please observe this.
XDrive on carefully.
XVisit aqualified specialist workshop.
$JN$ (USA only): the red brake system warning lamp is on while the engine is
running.
J (Canada only): the yellow brake system warning lamp is lit while the engine
is running.
Aw arning tone also sounds.
GWARNING
The brake boosting effect is malfunctioning and the braking characteristics may be
affected.
There is arisk of an accident.
XPull over and stop the vehicle safely as soon as possible, paying attention to road
and traffic conditions. Do not continue driving under any circumstances.
XSecure the vehicle against rolling away (Ypage 120).
XConsult aqualified specialist workshop.
XObserve the additional display messages in the multifunction display.
$JN$ (USA only): the red brake system warning lamp is on while the engine is
running.
J (Canada only): the yellow brake system warning lamp is lit while the engine
is running.
Aw arning tone also sounds.
There is not enough brake fluid in the brake fluid reservoir.
GWARNING
The braking effect may be impaired.
There is arisk of an accident.
XPull over and stop the vehicle safely as soon as possible, paying attention to road
and traffic conditions. Do not continue driving under any circumstances.
XSecure the vehicle against rolling away (Ypage 120).
XDo not add brake fluid. Adding more will not correct the malfunction.
XConsult aqualified specialist workshop.
XObserve the additional display messages in the multifunction display.
Warning and indicator lamp sinthe instrument cluster189
On-board computer and displays
Z

Engine
Warning/
indicator
lampNSignaltype
Possible causes/consequences and M
Solutions
;NThe yellow CheckE nginew arning lamp lightsupw hile theengine is running.
Therem ay beamalfunction, for example:
Rin th eengine management
Rin th efuel injection system
Rin th eexhaust system
Rin th eignition system
Rin th efuel system
The emission limit values may be exceeded and th eengine may be in emergency
mode.
XVisitaq ualified specialist workshop immediately.
In somes tates, you must immediately visi taqualified specialist workshop as soon
as th eyellow CheckE nginew arning lamp lightsu p. This is due to thelegal require-
ments in effect in these states. If in doubt,c heck whether suchl egal regulations
apply in th estate in whichy ou are currently driving.
8NThe yellow reservef uel warning lamp lightsupw hile theengine is running.
The fuel leve lhas dropped int othe reserver ange.
XRefuel at th enearest gas station.
8NThe yellow reservef uel warning lamp flashes while th evehicle is in motion.
In addition,t he; CheckE nginew arning lamp may light up.
The fuel fille rcap is no tclosed correctly or th efuel system is leaking.
XCheckt hatthe fuel fille rcap is correctly closed.
XIf th efuelfiller cap is not correctly closed: close thefuel fille rcap.
XIf th efuelfiller cap is closed: visitaq ualified specialist workshop.
?NThe red coolant warning lamp lightsupw hile theengine is runnin gand the
coolant temperatur egauge is at th estart of th escale.
The temperatur esensor for th ecoolant temperatur egauge is malfunctioning.
The coolant temperatur eisnolonger beingm onitored. Thereisar isk of engine
damag eifthecoolant temperatur eistoohigh.
XPull ove rand stop th evehicle safely and switch off th eengine ,payinga ttention
to road and traffic conditions. Do no tcontinue driving unde rany circumstances.
XSecure th evehicle against rolling away (Ypage 120).
XConsult aqualified specialist workshop.
194Warning and indicator lamps in th einstrumen tcluster
On-boardc omputer and displays