| 摘要 |
<p>A diagnosis system for diagnosing malfunctions of on-vehicle electronic control units (ECU) (11, 12, 13, 14) includes a plurality of ECUs and a diagnostic tester (20). The ECUs (11, 12, 13, 14) are connected to one another, thereby forming a communications network. The ECUs (11, 12, 13, 14) store data related to malfunctions. A diagnostic tester (20) is connected to an engine ECU (11) for reading the data stored in the ECUs (11, 12, 13, 14). The tester (20) transmits an initialization signal at a low speed to the ECU (11) when starting communicating with one of the ECUs. The ECU (11) selects a transmission rate between the ECU (11) and the tester (20) based on the initialization signal. <IMAGE></p> |
