GF54.00-P-0005VA CAN Data Bus, Function

GF54.00-P-0005VA CAN Data Bus, Function
MODEL 203 with ENGINE 272.920 up to Model Year 8
MODEL 211 with ENGINE 272.922
MODEL 203 with ENGINE 272.940 up to Model Year 8
MODEL 203 with ENGINE 272.941 up to Model Year 8
MODEL 171 with ENGINE 272.942 up to Model Year 8
MODEL 211, 219 with ENGINE 272.943
MODEL 211 with ENGINE 272.944
MODEL 251 with ENGINE 272.945 up to Model Year 8
MODEL 221 with ENGINE 272.946 up to Model Year 8
MODEL 203 with ENGINE 272.960 up to Model Year 8
MODEL 171 with ENGINE 272.963 up to Model Year 8
MODEL 211, 219 with ENGINE 272.964
MODEL 221 with ENGINE 272.965 up to Model Year 8
MODEL 230 with ENGINE 272.966 up to Model Year 8
MODEL 164, 251 with ENGINE 272.967 up to Model Year 8
MODEL 203 with ENGINE 272.970 up to Model Year 8
MODEL 211 with ENGINE 272.972
MODEL 221 with ENGINE 272.975 up to Model Year 8
MODEL 221 with ENGINE 273.922 up to Model Year 8
MODEL 164 with ENGINE 273.923 up to Model Year 8
MODEL 221 with ENGINE 273.924 up to Model Year 8
MODEL 211, 219 with ENGINE 273.960
MODEL 216, 221 with ENGINE 273.961 up to Model Year 8
MODEL 211 with ENGINE 273.962
MODEL 164, 251 with ENGINE 273.963 up to Model Year 8
MODEL 230 with ENGINE 273.965 up to Model Year 8
MODEL 209 with ENGINE 273.967
MODEL 221 with ENGINE 273.968 up to Model Year 8
MODEL 209 with ENGINE 272.940
MODEL 209 with ENGINE 272.960

CAN stands for "Controller Area Network". This is an electrical bus system for carrying data over two wires.
The tasks are:
^ Data exchange between individual control units
^ Readying sensor signals for several systems
^ Reducing the number of electrical lines
^ Improving the electromagnetic compatibility (EMC)
The CAN data bus consists of a special twisted two-core data line that connects all CAN subscribers (control units) in parallel.
The two lines of the data line must not be swapped (low level/high level). The motor electronics (N3/10) control unit is always a consumer with regard to bus adaptation.
A 120 ohms terminating resistor is therefore installed in the motor electronics control unit.
The data are transmitted digitally over the CAN databus at various intervals. The individual data blocks are defined in a data protocol and it is specified which data are received or transmitted by a control unit. Each connected control unit is able to transmit or receive data (bidirectional bus).
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.