Basic Principle(Analysis on Circuit Diagram)
CAN communication bus can realize the information sharing of CAN equipment such as ECU,CBCU,ABS,CAN Panel etc.，for example,water temperature,motor oil pressure and so on.Installing sensor on the ECU can send the real-time water temperature and motor oil pressure to CAN panel,which doesn’t need to install water temperature and motor oil pressure sensor.
Only CAN equipment can use CAN BUS,and sometimes there are several CAN equipment,such as ECU,CAN panel and BCM etc.,in one car.Each of CAN equipment can be called a joint and ECU is a joint.
There is only one high-speed internet in CX70,and there is a terminal resistance inside EMS and IP respectively.
CX70 CAN BUS is shown in Fig.2.6.CAN-high wire is light green and CAN-low wire is august green.
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Fig.2.6 CX70 CAN BUS Picture
In the CX70 CAN BUS system,the control unit of ECU,BCM,EPS,SRS,IPC,ABS,ESP and PDC are connected and communicated through CAN BUS,and decoder can communicate with each controller through Pin 6# and 14#(as shown in Fig.2.7).
Fig.2.7 Diagnostic Interface of CAN Wire