Mercedes-Benz ML320. Service manual - part 105

 

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Mercedes-Benz ML320. Service manual - part 105

 

 

247

Practical hints

What to do if …

Problem

Possible cause

Suggested solution

¿

The yellow BAS/ESP malfunc-
tion indicator lamp comes on 
while driving.

The charging voltage has fallen below 
10 volts. The BAS and the ESP have switched 
off.

When the voltage is above this value 
again, the BAS and ESP are operational 
again.

If necessary, have the generator and 
the battery checked.

¿

The yellow BAS/ESP malfunc-
tion indicator lamp comes on 
while driving.

The BAS or the ESP is malfunctioning.

Continue driving with added caution.

Have the BAS/ESP checked at an au-
thorized Mercedes-Benz Light Truck 
Center as soon as possible. 

Failure to follow these instructions 
increases the risk of an accident.

248

Practical hints

What to do if …

Problem

Possible cause

Suggested solution

?

The yellow “CHECK ENGINE” 
malfunction indicator lamp 
comes on while driving.

There is a malfunction of:

The fuel management system

The ignition system

The emission control system

Systems which affect emissions

Such malfunctions may result in excessive 
emissions values and may switch the engine 
to its limp-home (emergency operation) 
mode.

Have the vehicle checked as soon as 
possible by an authorized 
Mercedes-Benz Light Truck Center.
An on-board diagnostic connector is 
used by the service station to link the 
vehicle to the shop diagnostics sys-
tem. It allows the accurate identifica-
tion of system malfunctions through 
the readout of diagnostic trouble 
codes. It is located in the front left 
area of the footwell next to the park-
ing brake pedal.

The fuel cap is not closed tightly.

Check the fuel cap (

page 214).

Your fuel tank is empty.

After refuelling start the engine three 
or four times in succession.

The limp-home mode is canceled. You do 
not need to have your vehicle checked.

249

Practical hints

What to do if …

Problem

Possible cause

Suggested solution

/

The yellow coolant warning lamp 
comes on when the engine is 
running.

The coolant is to hot.

The coolant level is too low.

Stop as soon as possible and allow 
the engine and coolant to cool down.

Check the coolant level and add 
coolant if necessary (

page 222).

If the warning lamp comes on frequently, 
there is a leak in the cooling system.

Have the cooling system checked by 
an authorized Mercedes-Benz Light 
Truck Center.

The coolant temperature gauge is above 
248°F (120 °C).

The coolant level is too low.

Stop as soon as possible and allow 
the engine and coolant to cool down.

Add coolant to prevent engine from 
overheating (

page 222).

If the coolant level is correct, the electrical 
radiator fan may be broken.

If the coolant temperature is below 
the red zone, drive on to the nearest 
authorized Mercedes-Benz Light 
Truck Center.

Avoid high engine loads (e.g. driving 
uphill) and stop-and-go driving.

250

Practical hints

What to do if …

Warning!

G

Driving when your engine is badly overheat-
ed can cause some fluids which may have 
leaked into the engine compartment to 
catch fire. You could be seriously burned.

Steam from an overheated engine can cause 
serious burns and can occur just by opening 
the engine hood. Stay away from the engine 
if you see or hear steam coming from it.

Turn off the engine, get out of the vehicle 
and do not stand near the vehicle until the 
engine has cooled down.

Warning!

G

Do not spill antifreeze on hot engine parts. 
Antifreeze contains ethylene glycol which 
may burn if it comes into contact with hot 
engine parts. You can be seriously burned.

!

Do not ignore the coolant warning 
lamps. Extended driving with the sym-
bol displayed may cause serious engine 
damage not covered by the 
Mercedes-Benz Limited Warranty.

Do not drive without sufficient amount 
of coolant. The engine will overheat, 
causing major engine damage.

 

 

 

 

 

 

 

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