| 摘要 |
PROBLEM TO BE SOLVED: To speedily and surely diagnose a RAM being the factor of an A-grate fault without being protected by a redundant system or the like in the case of diagnosing the RAM of a microcomputer for controlling a vehicle. SOLUTION: In this RAM diagnostic method, RAMs of specific labels (labels 0, 1,...) in which plural specific data are to be written out of all RAM areas are previously selected as RAMs to be diagnosed and continuous addresses are allocated to the selected RAMs to summarize them. Or an address table storing addresses allocated to respective RAMs areas to be diagnosed is prepared to summarize them. Only the summarized RAMs to be diagnosed are diagnosed by a read/write checking method or the like at each prescribed time during the control of a vehicle.
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