Functions; Engine Management, Overall Network - Mercedes-Benz OM 471 Introduction Into Service Manual

Functions

Output signals, shown with code (M5Z)
Euro VI engine version
A4 Engine management control unit
(MCM)
CAN 4 Drive train CAN
Y608 Cylinder 1 fuel injector
Y609 Cylinder 2 fuel injector
After evaluation of the input signals the engine management
(MCM) control unit (A4) actuates the following actuators
depending on the engine operating conditions and the torque
specification from the drive control (CPC) control unit (A3):
Cylinder 1 fuel injector (Y608)
•
• Cylinder 2 fuel injector (Y609)
• Cylinder 3 fuel injector (Y610)
• Cylinder 4 fuel injector (Y611)
Cylinder 5 fuel injector (Y612)
•
• Cylinder 6 fuel injector (Y613)
• Exhaust gas recirculation positioner (Y621)
• Quantity control valve (Y642)

Engine management, overall network

Engine management behavior for
malfunctions
Start procedure, function
Idle speed control, function
Working speed control, function
Driving, function
Engine shutoff procedure, function
38
Y610 Cylinder 3 fuel injector
Y611 Cylinder 4 fuel injector
Y612 Cylinder 5 fuel injector
Y613 Cylinder 6 fuel injector
– This printout will not be recorded by the update service. Status: 09 / 2011 –
Y621 Exhaust gas recirculation positioner
Y624 Engine brake solenoid valve, stage 1
Y625 Engine brake solenoid valve, stage 2
Y642 Quantity control valve
If a fault occurs on the drive train CAN (CAN 4) or on a system
component for the engine management, the engine
management (MCM) control unit (A4) proceeds according to a
clearly defined pattern depending on the severity of the fault.
Thus it will fall back on replacement values for less severe faults
such as the failure of a sensor while it will go into emergency
mode for severe faults such as failure of the drive train CAN (CAN
4).
The driver is able to at least drive to the nearest workshop if there
is a fault in the system.
i The engine management (MCM) control unit (A4) is part of
the DAS, to which also the electronic ignition lock (EIS) (S1) and
the transmission control unit (TCM) (A5) belong. If one of these
control units or the electronic ignition lock (EIS) (S1) is replaced,
then it must undergo teach>in using the Star Diagnosis in the DAS.
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