Two technicians are discussing scan-tool use. Technician A says that a special diagnostic interface device is needed to connect the vehicle to the laptop computer. Technician B says that all of the computers in a modern vehicle are connected through an SAE-standard J1939 CAN (Central Area Network) or LAN (Local Area Network) connection. Who is correct?
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The second technician is correct.
The computer that is using a scan tool helps in the interface and diagnosing the whole process.
These automotive tools depend on the working process of SAE – standard for the J1939 that gives an idea about the connectivity.
Also, the modern vehicle is connected in the LAN or CAN system that allows them to be automotive or connected within a limited range.
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