Idle Speed Control, Function - Mercedes-Benz OM 471 Introduction Into Service Manual

Functions
GF07.16>W>2021H
ENGINE 471.9 in MODEL 963
Shown code (M5Z) Engine version Euro VI
A4 Engine management control unit
(MCM)
B600 Crankshaft position sensor
B601 Camshaft position sensor
B602 Fuel temperature sensor
B606 Exhaust coolant temperature
sensor
B608 Charge air pressure and
temperature sensor in charge air
pipe
i The idle speed is parameterized in the engine management
(MCM) control unit (A4). The drive control (CPC) control unit (A3)
can, however, send its own request via the drive train CAN (CAN
4), for example if the idle speed should be higher in order to
operate ancillary assemblies at their working speed.
The higher rotational speed is basically always regulated. In other
words, if the idle speed required by the drive control (CPC) control
unit (A3) is higher than the idle speed parameterized in the
engine management (MCM) control unit (A4), then the speed
required by the drive control (CPC) control unit (A3) is regulated
and vice versa.
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44

Idle speed control, function

B611 Temperature sensor downstream
of air filter (only for code (M5Z)
Engine version Euro VI)
B617 Charge air temperature sensor in
charge air housing
B621 Exhaust gas recirculation (AGR)
differential pressure sensor
B622 Rail pressure sensor
B638 Fuel filter module pressure sensor
– This printout will not be recorded by the update service. Status: 09 / 2011 –
CAN 4
Y608
Y609
Y610
Y611
Y612
Y613
Y621
Y642
The idle speed is regulated immediately after the starting
procedure or if the drive control (CPC) control unit (A3) recognizes
that the accelerator pedal is not being actuated.
While taking account of the idle speed specification from the
drive control (CPC) control unit (A3) and the current operating
condition of the engine, the engine management (MCM) control
unit (A4) calculates the optimal start of actuation for the fuel
injectors as well as the optimum actuation period (injection
quantity) while also ensuring that the fuel is injected at the
correct point in time, and in the correct quantities into the
respective combustion chamber through appropriate actuation of
the quantity control valve (Y642) and the fuel injectors for
cylinder 1 to 6 (Y608 to Y613).
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2.8.11
W07.16>1059>79
Drive train CAN
Cylinder 1 fuel injector
Cylinder 2 fuel injector
Cylinder 3 fuel injector
Cylinder 4 fuel injector
Cylinder 5 fuel injector
Cylinder 6 fuel injector
Exhaust gas recirculation
positioner
Quantity control valve