| 摘要 |
<p>A self-diagnosing apparatus of a vehicle, which can reliably hold and store diagnostic data relating to major troubles. A control unit (1) includes a CPU (101) and a RAM (102) that keeps the data if the ignition switch is turned off. The self-diagnosing apparatus detects a plurality of troubles, which are classified into major ones and minor ones. The RAM (102) includes a plurality of memory regions comprising a frame (1) and frame (2), and these frames (1) and (2) are corresponding to major and minor troubles, respectively. The CPU (101) processes diagnostic data of each part of the vehicle necessary for analyzing troubles of instruments and updates the memory contents of individual regions of the frames (1) and (2). If a trouble with an instrument is detected, the CPU (101) sets a trouble code to the leading region of the frame corresponding to that trouble, and inhibits subsequent updating of the memory content. Accordingly, the diagnostic data can be stored and held depending on the classification of trouble.</p> |
