C 280 (203.054) V6-3.0L (272.940) (2006)
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The sum of the data blocks, the short break between the two transfer intervals and other properties of the CAN data bus are checked constantly. Detected
faults are stored and placed in the fault memory.
In the vehicle a distinction is made between the fast (500 kbit/s) engine compartment data bus and diagnostic CAN-data bus and the slower (83.3 kbit/s)
interior CAN data buses.
The new control unit must be coded when a control unit is replaced. This control unit coding takes place via a STAR DIAGNOSIS menu.
The international standardized network management "OSEK" ( Open systems and their Interfaces for Electronics in motor vehicles) is used for all
control units of the CAN data bus.
GF54.00-P-0004-03A Data Bus System, Block Diagram
GF54.00-P-0004-03A Data Bus System, Block Diagram
All control units are interlinked through the CAN data bus.
A control unit receives a measured value from a sensor, prepares a data telegram from this and places it on the CAN data bus.
All other control units can then read and process this data packet.
GF54.00-P-0004-04A Data Bus System, Advantages
GF54.00-P-0004-04A Data Bus System, Advantages
With the former wiring of the individual electrical and electronic components (standard wiring) each control unit is directly connected to all sensors and
actuators, from which it obtains measured values or which it actuates.
In some cases, this can result in long or redundant cable runs. The data bus system affords the following advantages relative to conventional wiring:
