Edc 4 - Volvo TD420VE Operator's Manual

EDC 4

EDC 4 (Electronic Diesel Control) and is an electronic system with CAN (Controller Area Network) or poten-
tiometer communication for diesel engine control. The system includes fuel management and diagnostic func-
tions.
Summary
The system includes sensors, control unit and an en-
gine speed regulator. The sensors send input signals
to the control unit, which controls the control rod for
the injection pumps in its turn, by means of an actua-
tor in the engine speed regulator.
Input signals
The control unit receives input signals about engine
operating conditions from the following components:
– speed sensor, camshaft
– coolant temperature sensor
– charge pressure sensor
– oil pressure sensor
– fuel temperature sensor
– coolant level sensor (the function is implemented
in the control unit as standard, but no sensor is
supplied with the engine as a standard feature)
Output signals
The control unit controls the following components on
the basis of the input signals received:
– engine speed regulator (with position sensor for
the control rod and acutator)
– electric air pre-heating (option)
Information from the sensors provides exact informa-
tion about current operation conditions and allows the
processor to calculate the correct fuel volume, check
engine status etc.
Diagnostic function
The task of the diagnostic function is to discover
and localize any malfunctions in the EDC 4 system,
to protect the engine and to ensure operation in the
event of serious malfunctions.
If a malfunction is discovered, this is notified by the
diagnostic function, by warning lamps or via the
CAN network. By pressing the diagnostic switch, the
operator will receive a fault code as a guide for any
fault-tracing. Fault codes can also be output via the
CAN interface or with Volvo's VODIA tool (including
the Penta EDC4 software) at an authorized Volvo
Penta workshop.
If there is a serious malfunction, the engine is shut
down altogether. Yet again, fault codes can be output
via diagnostic connector, the CAN interface or with
Volvo's VODIA tool (including the Penta EDC4 soft-
ware) at an authorized Volvo Penta workshop.
Presentation
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