| 摘要 |
Provided is a power supply breaker circuit diagnosing technique capable of accurately detecting functional failure of a power supply relay of an electronic control device for a vehicular automatic transmission, and capable of reliable transition to a fail-safe state, without requiring a change in the internal configuration of the current electronic control device, and with a minimum of system modification. By utilizing a network communication channel such as a CAN implemented on an electronic control device (ATCU) for a vehicular automatic transmission, and using another electronic control device as an ATCU monitor device, the other electronic control device which is on the monitoring side controls a breaker circuit of the ATCU. The other electronic control device on the monitoring side breaks the breaker circuit of the ATCU for a certain period, and makes a diagnosis by detecting communication loss from the ATCU. |
