2006 MERCEDES-BENZ G55AMG check engine

235 Operation
Driving instructions

Clean all exterior lamps and check
them for possible damage.

Check for brush or branches caught in
the underbody.
They could increase the possibility of a
fire, as well as cut fuel and/or brake
lines, puncture rubber bellows of the
axles or drive shafts.

After continued operation in mud,
sand, water or other dirty conditions,
clean the brake discs, wheels, brake
pads, and check and clean axle joints.

Conduct a brake test.Control and operation of radio trans-
mitters
COMAND, radio and telephone*Telephones and two-way radios
Radio transmitters, such as a portable tele-
phone or citizens band unit should only be
used inside the vehicle if they are connect-
ed to an antenna that is installed on the
outside of the vehicle.
Refer to the radio transmitter operation in-
structions regarding use of an external an-
tenna.
Warning!G
Do not forget that your primary responsibili-
ty is to drive the vehicle safely. Only operate
the COMAND, radio or telephone
1 if road,
traffic and weather conditions permit.
Bear in mind that at a speed of just 30 mph
(approximately 50 km / h), your vehicle is
covering a distance of 44 feet
(approximately 14 m) every second.
1Observe all legal requirements.
Warning!G
Never operate radio transmitters equipped
with a built-in or attached antenna (i.e. with-
out being connected to an external antenna)
from inside the vehicle while the engine is
running. Doing so could lead to a malfunc-
tion of the vehicle’s electronic system, pos-
sibly resulting in an accident and/or
personal injury.

240 Operation
At the gas station
Check regularly and before a long trip
G 500
1Coolant
2Brake fluid
!
The fuel filler cap is tethered to the fuel
filler neck. Do not drop the cap. It could
damage the vehicle paint finish.
When refueling the vehicle, make cer-
tain that no gasoline comes into con-
tact with plastic tail lamp to prevent
damaging the lens.
i
Use only premium unleaded gasoline
with a minimum Posted Octane Rating
of 91 (average of 96 RON / 86 MON).
Information on gasoline quality can
normally be found on the fuel pump.
More information on gasoline can be
found in the Factory Approved Service
Products pamphlet.
i
Leaving the engine running and the fuel
cap open can cause the ? malfunc-
tion indicator lamp (USA only) or the
± malfunction indicator lamp
(Canada only) to illuminate.
See also “Practical hints” section
(
page 294).


241 Operation
At the gas station
G55AMG
1Coolant
2Brake fluidCoolant
For normal replenishing, use water (pota-
ble water quality). For more information,
see “Coolant level” (
page 248) and see
“Fuels, coolants, lubricants, etc.”
(
page 376).
Brake fluidEngine oil level
For more information on engine oil, see
“Engine oil” (
page 243).
Tire inflation pressure
For more information, see “Checking tire
inflation pressure” (
page 261).
Vehicle lighting
Check function and cleanliness. For infor-
mation on replacing light bulbs, see “Re-
placing bulbs” (
page 335).
For more information, see “Exterior lamp
switch” (
page 110).
Windshield/rear window washer sys-
tem and headlamp cleaning system
For more information on refilling the reser-
voir, see “Windshield/rear window washer
system and headlamp cleaning system”
(
page 249).
i
Opening the hood, see (page 242).
!
If you find that the brake fluid in the
brake fluid reservoir has fallen to the
minimum mark or below, have the
brake system checked for brake pad
thickness and leaks immediately. Noti-
fy an authorized Mercedes-Benz Light
Truck Center immediately. Do not add
brake fluid as this will not solve the
problem. For more information, see
“Practical hints” (
page 292).

243 Operation
Engine compartment
Closing
Lower hood and let it drop into lock
from a height of approximately 0.7 ft
(20 cm).
The hood will lock audibly.
Check to make sure the hood is fully
closed.
If you can raise the hood at a point
above the turn signals to the left and
right of the hood, then it is not properly
closed. Open it again and let it drop
with somewhat greater force.
Engine oil
The amount of oil your engine needs will
depend on a number of factors, including
driving style. Higher oil consumption can
occur when

the vehicle is new

the vehicle is driven frequently at
higher engine speeds
Engine oil consumption checks should only
be made after the vehicle break-in period.
Warning!G
The engine is equipped with a transistorized
ignition system. Because of the high voltage,
it is dangerous to touch any components (ig-
nition coils, spark plug sockets, diagnostic
socket) of the ignition system

with the engine running

while starting the engine

if ignition is “on” and the engine is
turned manually
Warning!G
Be careful that you do not close the hood on
anyone.
!
Do not push the hood closed manually,
as this could damage it.
i
Do not use any special lubricant addi-
tives, as these may damage the drive
assemblies. Using special additives not
approved by Mercedes-Benz may
cause damage not covered by the
Mercedes-Benz Limited Warranty.
More information on this subject is
available at any Mercedes-Benz Light
Truck Center.

244 Operation
Engine compartment
Checking engine oil level with the
control system
When checking the oil level

the vehicle must be parked on level
ground

with the engine at operating tempera-
ture, the vehicle must have been sta-
tionary for at least five minutes with the
engine turned off

with the engine not at operating tem-
perature yet, the vehicle must have
been stationary for at least 30 minutes
with the engine turned off
To check the engine oil level via the
multifunction display, do the following:
Switch on the ignition (page 35).
The standard display (
page 123) should
appear in the multifunction display.
Press buttonk orj on the
steering wheel until the following
message is seen in the multifunction
display:
ENGINE OIL LEVEL
MEASURING NOW
MEASURE. CORRECT
ONLY IF VEH. LEVEL
One of the following messages will
subsequently appear in the indicator:

ENGINE OIL LEVEL
OK

ADD 1.0 Qt. TO
REACH MAX. OIL LEVEL!
(Canada: 1.0 LITER)

ADD 1.5 Qts. TO
REACH MAX. OIL LEVEL!
(Canada: 1.5 LITERS)

ADD 2.0 Qts. TO
REACH MAX. OIL LEVEL!
(Canada: 2.0 LITERS)
If necessary, add engine oil.
For adding engine oil see (
page 247).
For more information on engine oil, see the
“Technical data” section (
page 376) and
(
page 377).
i
If you want to interrupt the checking
procedure, press thek orj
button on the multifunction steering
wheel.

245 Operation
Engine compartment
Other display messages
If the SmartKey is not turned to position2
in the starter switch, the following
message will appear:
FOR ENGINE OIL LEVEL
SWITCH ON IGNITION!
Switch on the ignition (page 35).
If you see the message:
OBSERVE WAITING PERIOD
If engine is at operating temperature,
wait five minutes before repeating
check procedure.
If engine is not at operating tempera-
ture yet, wait 30 minutes before re-
peating check procedure.If you see the message:
ENGINE OIL LEVEL
NOT WHEN ENGINE ON!
Turn off the engine.
If the engine is at operating tempera-
ture, wait five minutes before checking
oil.
If the engine is not at operating temper-
ature yet, you must wait 30 minutes
before checking oil.
If there is excess engine oil with the engine
at normal operating temperature, the
following message will appear:
ENGINE OIL LEVEL
REDUCE OIL LEVEL
Have excess oil siphoned or drained
off. Contact an authorized
Mercedes-Benz Light Truck Center.For more information on messages in the
multifunction display concerning engine
oil, see the “Practical hints” section
(
page 311).
!
Excess oil must be siphoned or drained
off. It could cause damage to the
engine and catalytic converter not
covered by the Mercedes-Benz Limited
Warranty.
i
Perform the engine oil level check with
the dipstick if it cannot be completed
with the control system (
page 246).
In this case we recommend that you
have the system checked at a
Mercedes-Benz Light Truck Center.

246 Operation
Engine compartment
Checking engine oil level with the oil
dipstick
When checking the oil level the vehicle
must

be parked on level ground

be at normal operating temperature

have been stationary for at least
5 minutes with the engine turned offTo check the engine oil level with the oil
dipstick, do the following:
Open the hood (page 242).
Pull out oil dipstick1 (page 247).
Wipe oil dipstick1 clean.
Fully insert oil dipstick1 into the
dipstick guide tube.
Pull out oil dipstick1 again after
approximately three seconds to obtain
accurate reading.
Oil dipstick
The oil level is correct when it is between
the lower (min) and upper (max) mark of
the oil dipstick.
If necessary, add engine oil.
For adding engine oil, see (
page 247).
For more information on engine oil, see the
“Technical data” section (
page 376) and
(
page 377).
For more information on messages in the
multifunction display concerning engine
oil, see the “Practical hints” section
(
page 311).
i
The engine oil level can be checked by
either the oil dipstick or via the multi-
function display in the instrument
cluster (
page 244). The amount of
engine oil needed is shown more
precisely in the multifunction display.
i
The filling quantity between the upper
and lower marks on the oil dipstick is
approximately 2.1 US qt. (2.0 l).

248 Operation
Engine compartment
Screw oil filler cap2 back on filler
neck.
For more information on engine oil, see the
“Technical data” section (
page 376) and
(
page 377).
Transmission fluid level
The transmission fluid level does not need
to be checked. The transmission has a per-
manent supply of automatic transmission
fluid.
If you notice transmission fluid loss or gear
shifting malfunctions, have an authorized
Mercedes-Benz Light Truck Center check
the automatic transmission.
Coolant level
The engine coolant is a mixture of water
and anticorrosion/antifreeze.
When checking the coolant level,

the vehicle must be parked on level
ground.

the engine must be cool. The coolant
level should reach the Cold Level mark
(plastic bridge) in the reservoir.
!
Excess oil must be siphoned or drained
off. It could cause damage to the
engine and catalytic converter not
covered by the Mercedes-Benz Limited
Warranty.Warning!G
In order to avoid any possibly serious burns:

Use extreme caution when opening the
hood if there are any signs of steam or
coolant leaking from the cooling system,
or if the coolant temperature display in-
dicates that the coolant is overheated.

Do not remove pressure cap on coolant
reservoir if coolant temperature is
above 158°F (70°C). Allow engine to
cool down before removing cap. The
coolant reservoir contains hot fluid and
is under pressure.

Using a rag, slowly open the cap approx-
imately 1/2turn to relieve excess pres-
sure. If opened immediately, scalding
hot fluid and steam will be blown out un-
der pressure.

Do not spill antifreeze on hot engine
parts. Antifreeze contains ethylene gly-
col which may burn if it comes into con-
tact with hot engine parts.