Component Description Drive Control (Cpc) Control Unit - Mercedes-Benz OM 471 Introduction Into Service Manual

System components
GF30.35>W>4105H
MODEL 963, 964
Location
A3 Drive control (CPC) control unit
The drive control (CPC) control unit (A3) is located on the
passenger>side in the electronics compartment.
Task
The drive control (CPC) control unit (A3) calculates various control
factors relevant for the driving cycle for the following functions
dependent on the current transmission mode:
f Cruise control
f Limiter
f Proximity Control Assist
(for code (S1l) Proximity Control Assist)
f Engine brake (computation of braking torque)
f Coolant temperature management
f Automatic gear detection
Monitoring of the coolant level
f
f Monitoring of the charging current
f Monitoring of the air filter
f Legal vehicle speed limit
f Diesel particulate filter (DPF) regeneration
f Computation/correction of the engine specified torque
f Retarder control
(for code (B3H) Secondary water retarder)
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
Function
To record and evaluate electric sensor signals and switch signals
f Accelerator pedal sensor (B44)
f Coolant level switch (B47)
f Air filter sensor (B48)
f Coolant pressure regulation sensor (B87)
(for code (B3H) Secondary water retarder)
Alternator (G2)
f
(determination of status of circuit 50 and charge current
monitoring)
f Right multifunction control lever (S23)
102

Component description drive control (CPC) control unit

– This printout will not be recorded by the update service. Status: 09 / 2011 –
According to the tasks performed the drive control (CPC) control
unit (A3) is positioned in the Control Area Network (CAN) as the
central interface (Gateway) between the frame CAN (CAN 3) and
the drive train CAN (CAN 4).
The drive control (CPC) control unit communicates via CAN with
the following control units:
f IC control unit (ICUC) (A1)
f Central gateway (CGW) control unit (A2)
f Engine management (MCM) control unit (A4)
f Transmission (TCM) control unit (A5)
f Cab signal acquisition and actuation module (SCA) control
unit (A7)
f Antilock brake system (ABS) control unit, 4>channel (A10)
f Electronic Brake Control (EBS) control unit (A10b)
(Wabco)
f Electronic Brake Control (EBS) control unit (A10c)
(Knorr)
f Retarder control (RCM) control unit (A11)
f Parameterizable special module (PSM) control unit (A22)
f Exhaust aftertreatment (ACM) control unit (A60)
f Tachograph (P1)
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
Electrical actuation of components
f Coolant pressure regulation solenoid (Y53)
(for code (B3H) Secondary water retarder)
f Controller unit for lower radiator shutters (A54)
(for code (M7K) Radiator shutters)
f Controller unit for upper radiator shutters (A55)
(for code (M7K) Radiator shutters)
Records, evaluates and transmits CAN messages
CAN messages are made available via frame CAN (CAN 3) and
drive train CAN (CAN 4) which are relevant for the respective
functions from other control unit and are also vise versa sent to
these.
1.7.11
W30.35>1237>11