< br >
There are generally three reasons for the failure of Nissan CAN bus system:
< br >
1, the fault caused by the automotive power supply system: the working voltage of the automotive electronic control module is generally 10.5-15.0V, if the working voltage provided by the automotive power supply system is abnormal, it will make some electronic control modules appear abnormal for a short time, which will cause the entire automotive CAN bus system to communicate badly.
< br >
2, the link failure of the car CAN bus system: when there is a short circuit of the communication line, a break or a change in the physical properties of the line to cause the attenuation or distortion of the communication signal, it will lead to a number of electronic control units working abnormally, so that the CAN bus system can not work.
< br >
3, the node failure of the automobile CAN bus system: the node is the electronic control module in the automobile CAN bus system, so the node failure is the fault of the electronic control module. Including software failure, that is, the transmission protocol or software program has defects or conflicts, so that the communication of the automobile CAN bus system is confused or unable to work, this kind of failure generally occurs in batches; Hardware failure is generally the fault of the electronic control module chip or integrated circuit, resulting in the car CAN bus system can not work normally.
The general causes of failure are as follows:
1, the vehicle installed electrical equipment affects the vehicle network, resulting in transmission CAN bus communication failure, check and confirm after removing the installed equipment;
2, transmission CAN bus high and low voltage communication line failure, CAN measure OBD interface CAN bus voltage, resistance check;
3, vehicle transmission module (TCU) failure, CAN measure OBD interface CAN bus voltage, resistance check.