Mercedes-Benz OM 904 LA, Руководство по эксплуатации

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Example: electronics warning lamp
If the electronics warning lamp does not go
out, or if it lights up while the engine is run-
ning, there is a malfunction in the electronic
engine control unit.
Each malfunction is stored in the system with
its own fault code. Temporary faults are also
stored.
Fault codes can be read using the Mercedes-
Benz diagnostic tester STAR DIAGNOSIS or
minidiag2 (
Y
page 8). If the electronics warn-
ing lamp lights up while the engine is running,
read or determine the fault code.
Oil pressure
! Once the operating temperature has been
reached, the engine oil pressure may not
drop below the following values:
R
2.5 bar at rated speed
R
0.5 bar at idling speed
If the oil pressure falls below these values,
stop the engine and trace the cause.
Operating restrictions with on-highway
applications
The electronics monitor:
R
the display, level and quality of the
AdBlue
®
/DEF reducing agent
R
the efficiency of the catalytic converter in
accordance with the permitted thresholds
for nitric oxide emissions (NOx)
Requirements for vehicles
The engine output can be automatically
reduced the first time the vehicle is stationary
if:
R
the AdBlue
®
/DEF reservoir is empty
R
the permitted thresholds for nitric oxide
(NOx) emissions are exceeded
Torque reduction
If the AdBlue
®
/DEF is used up or if there is a
fault, the indicator lamp in the instrument
panel lights up or flashes. Additionally the
display shows a message. The engine output
is only reduced after up to four journeys when
a fault is detected and confirmed.
The degree of torque reduction depends on
the vehicle category:
R
vehicles above 7.5 t: torque reduction by
approximately 40%
R
vehicles below 7.5 t: torque reduction by
approximately 25%
Fault in the monitoring system
If a fault is detected in the electronic moni-
toring of the exhaust gas aftertreatment sys-
tem, the torque is reduced automatically after
36 operating hours of the engine.
Operating restrictions for off-highway
engines
Minor operating restriction
The available torque is reduced to roughly
80% of the maximum torque.
Reduction in output during minor operating restric-
tion
Operation
39
Driving mode/working mode
Z