Electronic control unit

An electronic control unit comprising:

• an abnormality determiner configured to determine an abnormality of a vehicle by performing an abnormality diagnosis;
• a first storage configured to store a readiness information, the readiness information (i) indicating that the abnormality determiner has performed the abnormality diagnosis for all of a plurality of abnormality diagnosis items and (ii) indicating that the readiness information is complete;
• and
• a second storage configured to store a history of the abnormality diagnosis, the history of the abnormality diagnosis including information of whether a normal history exists indicating that a normal condition of one of the abnormality diagnosis items is satisfied, wherein
• the abnormality determiner is further configured to
• determine whether the history of the abnormality diagnosis including the information of existence of the normal history is stored in the second storage when the abnormality determiner performs the abnormality diagnosis,
• use a relaxed condition in place of the normal condition for the abnormality diagnosis item during the abnormality diagnosis when the history of the abnormality diagnosis including the information of existence of the normal history is stored in the second storage, wherein
• when the abnormality determiner uses the relaxed condition during one or more controls being performed in the vehicle while performing the abnormality diagnosis, the abnormality determiner completes and stores the readiness information more quickly using the relaxed condition than when the abnormality determiner uses the normal condition while performing the abnormality diagnosis, wherein the relaxed condition has fewer items and/or more easily completed items than the normal condition.