FR (drive control) unit or ADM (on the
equipment)
The engine can be adapted to the various
operation-specific requirements
using the FR
(drive control) unit or the adaptation module
ADM.
Example: FR (drive control) unit
Various operation specific data such as
engine idling speed, maximum working
engine speed or speed limiter are stored in
the FR (drive control) unit or the ADM.
The FR (drive control) unit or the ADM
receives data from:
R
user (values from the position sensor,
engine start/stop)
R
engine brake switch
R
other systems (e.g. acceleration skid con-
trol)
R
engine control unit (e.g. oil pressure and
coolant temperature)
Values for the engine control (MR control
unit) are derived from this and conveyed via
the CAN line.
The FR (drive control) unit or the ADM con-
trols various displays, e.g. the electronics
warning lamp, the engine brake and the con-
stant throttle valve.
If the electronic engine control detects a
fault, the fault code is saved in the control
units. It
can be read out with the correspond-
ing diagnostic testers (STAR DIAGNOSIS or
minidiag2).
In addition, the ^ electronics warning
lamp is switched on.
i
Mercedes-Benz diagnostic
testers can be
connected to the 14-pin diagnostic socket
on the equipment or with the EU compliant
service connector. Both fault memory and
stored engine data can be read out using
this equipment.
SCR frame module (on the frame)
SCR frame module
The SCR frame module reads signals and
transmits them
via the CAN line to the engine
control unit.
The following signals are read:
R
Temperature sensor upstream of the SCR
catalytic converter
R
Temperature sensor downstream of the
SCR catalytic converter
R
NOx sensor downstream of the SCR cata-
lytic converter
R
Combination sensor for level and temper-
ature in the AdBlue
®
/DEF tank
R
Combination sensor for humidity and air
charge temperature
Example: diagnostic socket
General information
23
At a glance
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