Mercedes-Benz OM 904 LA Operating Instructions Manual page 101

Practical advice
Malfunctions, causes and solutions
Malfunction
Engine does not start or stalls again imme-
diately
Engine starts poorly
Engine stops inadvertently
6
98
Cause
Incorrect engine oil viscosity
MR (engine control) unit malfunction
Leaks or insufficient pressure in the low-
pressure fuel circuit
MR (engine control) unit malfunction (total
failure)
Power supply to the MR/ADM control
units interrupted or short circuit in wiring
Leaks or insufficient pressure in the low-
pressure fuel circuit or a fuel delivery
pump drive malfunction
Solution
Alter the engine oil viscosity to the con-
ditions of use
Read out the MR (engine control) unit,
have it checked at a qualified specialist
workshop
Check for leaks (visual check); have
the pressure tested at a qualified spe-
cialist workshop
Have it checked at a qualified special-
ist workshop
Have it checked at a qualified special-
ist workshop
Check for leaks (visual check); have
the pressure tested at a qualified spe-
cialist workshop