Importance

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Abstract

An electronic control system with a self-diagnostic function for use in a motor vehicle, which is arranged to write the vehicle operation state data such as engine intake air amount at the time of no occurrence of abnormality into the internal memory of a microcomputer basically making up an electronic control system and, in response to the occurrence of abnormality, add check-function data to the operation state data which is in turn transferred to a backup memory. That is, at the time when abnormality occurs, the data whose significance is relatively high are stored in an internal storage of a microcomputer such as a non-volatile battery-backup RAM with check-function data being respectively added thereto so as to improve the data reliability. On the other hand, the data whose significance is relatively low are stored in an external storage such as a battery-backup RAM, together with check-function data for totally checking the data, thereby improving the data reliability. In addition, the storing of the data into two kinds of storages allows improvement of the storage capacity.

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First Claim