Inspection apparatus and inspection method

An inspection apparatus that inspects a CAN communication function of an ECU to be inspected, the inspection apparatus comprising:

• at least one processor circuit with a memory comprising instructions, that when executed by the at least one processor circuit, cause the at least one processor circuit to at least:
• connect a communication circuit of the ECU and the inspection apparatus on a one-to-one basis;
• create an inspection message in which a predetermined signal level indicating a higher priority of communication arbitration than the message received from the ECU to be inspected is set in an identifier field of a data format corresponding to the message;
• transmit the inspection message to the ECU;
• receive a message transmitted from the ECU;
• determine whether a reception function of the ECU is normal based on whether the message has been received from the ECU after transmission of the inspection message;
• and change a determination duration time for determining whether the CAN communication function is normal, a first determination duration time or a second determination duration time shorter than the first determination duration time, by an input from a sensitivity changeover switch.