| 摘要 |
In a multiplex transmission system for vehicles a transmission path is made usually in the form of a loop, where one master-like supervisory node and a plurality of slave-like ordinary nodes are connected to the path. During diagnosis, this transmission path is interrupted, thus interrupting the loop. On the interrupted transmission path, the master supervisory node causes a diagnostic signal to flow in the two directions of the transmission path. The supervisory node pinpoints the position of a line disconnection in the transmission path on the basis of a reception confirmation signal received regarding respective directions from each of the ordinary nodes.
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