Mercedes-Benz M-Class Operator's Manual page 145

Problems with the engine
Problem
The engine does not
start. The starter motor
can be heard.
The engine does not
start. You cannot hear
the starter motor.
The engine is not
running smoothly and
is misfiring.
The coolant
temperature gauge
shows a value above
248 ‡ (120 †).
Possible causes/consequences and M Solutions
There is a malfunction in the engine electronics.
R
There is a malfunction in the fuel supply.
R
Try to start the engine again (
X
long and frequent attempts to start the engine as these will drain
the battery.
If the engine does not start after several attempts:
Consult a qualified specialist workshop, e.g. an authorized
X
Mercedes-Benz Center.
The on-board voltage is too low because the battery is too weak
or discharged.
Jump-start the vehicle (
X
If the engine does not start despite attempts to jump-start it:
Consult a qualified specialist workshop, e.g. an authorized
X
Mercedes-Benz Center.
The starter motor was exposed to a thermal load that was too high.
Allow the starter motor to cool down for approximately two
X
minutes.
Try to start the engine again.
X
If the engine still does not start:
Consult a qualified specialist workshop, e.g. an authorized
X
Mercedes-Benz Center.
There is a malfunction in the engine electronics or a mechanical
component of the engine management system.
Only depress the accelerator pedal slightly.
X
Have the cause rectified immediately at a qualified specialist
X
workshop, e.g. an authorized Mercedes-Benz Center.
Otherwise, non-combusted fuel may get into the catalytic
converter and damage it.
The coolant level is too low. The coolant is too hot and the engine
is no longer being cooled sufficiently.
Stop as soon as possible and allow the engine and the coolant
X
to cool down.
Check the coolant level (
X
notes as you do so and add coolant if necessary.
I n f o r ma t i o n P r o v i d e d b y :
page 140). Avoid excessively
Y
page 341).
Y
page 315). Observe the warning
Y
Driving
143
Z