Electronic control apparatus which responds to shut-down command by executing specific processing prior to ceasing operation

An electronic control apparatus comprising

• a control circuit which performs processing for controlling a control object, and
• controlled power supply means responsive to a power-on command status of an externally supplied power supply on/off changeover command for supplying a power supply voltage to operate said control circuit,
• with said controlled power supply means comprising a power supply holding function whereby said controlled power supply means is responsive to initiation of said power-on command status for beginning to supply said power supply voltage to said control circuit, and is responsive to initiation of a power-off command status of said power supply on/off changeover command for terminating the supplying of said power supply voltage to said control circuit, until completion of the execution of specific processing by said control circuit;
• wherein said electronic control apparatus comprises measurement means for measuring a duration of a power supply holding interval that extends from a point of changeover from said power-off command status to said power-on command status up to a point of cessation of supplying said power supply voltage to said control circuit, and
• abnormality detection means for detecting an abnormality of said power supply holding function based upon said measured duration obtained by said measurement means.