Patent ID: 8306688
Filing Date: 2012-11-06
Classification: F02D

Abstract:
1. An electronic control device capable of performing processing indicated by a command when receiving the command from outside of the electronic control device, the device comprising: a diagnosis unit for performing diagnosis of at least one diagnosis item while energized and for storing, to a trouble information storage, a diagnostic trouble code (DTC) indicative of a trouble detected by the diagnosis; a non-volatile memory that is capable of storing data in a re-writable manner; an information selection unit for selecting, from among DTCs in the trouble information storage, DTC to be saved in the non-volatile memory as a permanent diagnostic trouble code (PDTC) based on a save criterion and storing the DTC selected in a buffer as a PDTC; and a trouble information preservation unit for performing preservation of the DTC by writing the PDTC stored in the buffer into the non-volatile memory after a turning-off of an ignition switch of a vehicle or upon receiving a command from outside of the device, wherein the trouble information preservation unit causes the information selection unit to select the DTC prior to performing processing indicated by the received command whenever the received command is a specific command that indicates erasure of the DTC from the trouble information storage.