Apparatus for detecting and indicating abnormality in an electronic control system for internal combustion engines

摘要

An apparatus for detecting and indicating abnormality in an electronic control system for an internal combustion engine, which system includes an operation control unit operable on a supply voltage from a first power source to supply a plurality of output means with operation control signals dependent on the values of parameter signals detected by a plurality of input means. A plurality of abnormality detecting circuits detect abnormality in the operation of respective ones of the input and output means, and generate abnormality-indicative signals when abnormality is detected. A memory stores data of the abnormality-indicative signal supplied from the abnormality detecting circuits. Abnormality indicating circuit indicates the data stored in the memory. The memory is operable on a supply voltage from a second power source, and adapted to erase the data stored therein when it starts to be supplied with a supply voltage from the second power source.