CAN communication system
The CAN communication system (Controller Area Network) is a type of network used in modern cars to allow various electronic components to communicate with each other. It's a standard communication protocol that allows for real-time data transmission between different modules in the car, such as the engine control module (ECM), transmission control module (TCM), and body control module (BCM).
The CAN system is a two-wire communication protocol that uses a twisted-pair wiring harness to connect all the modules in the car. Each module on the network is assigned a unique address, which allows them to communicate with each other in a specific sequence.
Benefits of CAN Communication System
The benefits of using a CAN communication system in a car include:
- Faster data transmission: The CAN system allows for real-time data transmission between different modules in the car, which improves overall vehicle performance and safety.
- Reduced wiring: Using a CAN system reduces the amount of wiring needed in a car, which saves space and weight, and reduces the complexity of the vehicle's electrical system.
- Improved diagnostics: The CAN system allows for more comprehensive diagnostics of the car's electronic systems. This helps to improve the accuracy of troubleshooting and repairs, and reduces the time and cost associated with diagnosing and repairing issues.
- Greater flexibility: The CAN system is highly configurable, which allows for customization of the vehicle's electronic systems to meet specific needs or requirements.However, there are some potential issues that can arise with the CAN system in a car, such as:
- Malfunctioning modules: If one module on the network malfunctions, it can cause problems with other modules on the network. This can result in drivability issues or even complete system failure.
- Electrical interference: The twisted-pair wiring harness used in the CAN system is susceptible to electrical interference, which can cause signal degradation and communication errors.
- Hacking risks: The CAN system is vulnerable to hacking and cyber attacks, which can compromise the security and safety of the vehicle.
Overall, the CAN communication system is a highly advanced and effective technology used in modern cars. It allows for improved performance, efficiency, and safety, while reducing the complexity and cost of the vehicle's electrical system.
Wiring system of CAN Communication System
In a car, the CAN communication wiring system typically consists of several components, including the following:
- CAN Bus: The physical medium that connects all the devices in the car's CAN communication system. The CAN bus typically consists of two wires: CAN High (CAN_H) and CAN Low (CAN_L). These wires are twisted together to reduce noise and electromagnetic interference.
- Control Units: The electronic devices that control various functions in the car, such as the engine, transmission, brakes, and airbags. Each control unit is connected to the CAN bus via a transceiver and has a unique identifier that allows it to communicate with other control units in the system.
- Diagnostic Connector: The connector that allows diagnostic tools to communicate with the car's control units via the CAN bus. The diagnostic connector is usually located under the dashboard and is used by technicians to diagnose and troubleshoot problems in the car.
- Terminators: The resistors that are used to terminate the CAN bus at both ends. In a car, the terminators are usually integrated into the control units, and no external terminators are needed.
Which pins need for diagnostic
CAN Communication system live in 16 pin diagnostic socket pin 6 and 16.
Pin 4 and 5 (ground pin) and pin 16 (12 volt supply).