CAN1/J1939 control bus
System control signals are sent via this bus. The control bus is
very quick, which is necessary for control of the entire system to
work and quickly adapt to changing conditions.
The main communication alternative is the CAN1/J1939-bus.
However, for E-ECU, some control data is only sent on the J1587/
J1708-bus.
CAN2/J1939 control bus
CAN2/J1939 is used to obtain redundancy for CAN-communica‐
tion.
J1587/1708 information bus
The information bus is connected to the control units and service
socket. Information and diagnostic signals are sent on this bus.
In addition, some control data is sent from the engine control unit
via this bus.
The bus also acts as a “back-up” for the control bus if it does not
work for some reason. The system's status is continuously
updated and available for reading via the information bus.
By connecting VCADS Pro to service socket VP, it is possible to
read error codes, perform test, delete logged information, down‐
load parameters, and download software.
Software, description
Regarding: L60F, L70F, L90F
Software is stored in the control units. To determine which soft‐
ware is in the control units, the part number of the software (Main
software) is read in the information panel or with the service tool
VCADS Pro.
Updating of the machine's software is handled through release of
a new edition. The releases are designated with Year:edition, for
example, R2006:5 and gets a new part number.
Updating of software for control units takes place through down‐
loading of new software from VOLVO with VCADS Pro.
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