| 摘要 |
A vehicle is equipped with an engine control ECU, an anti-lock brake system control ECU, a transmission control ECU and a meter control ECU. Each ECU shares information with the others by communicating and by performing mutual malfunction diagnosis operations through communication; also, backup operations are performed. After the deactuation of the ignition switch, malfunction diagnosis operations are prohibited by prohibiting communication between the engine control ECU which is supplied with electric power and the other ECUs which are not supplied with electric power. After the deactuation of the ignition switch, when a predetermined time lapses after the actuation of the ignition switch from the state wherein the ECU is supplied with power, prohibition on communication with ECUs is released.
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