ON-VEHICLE ELECTRONIC CONTROL DEVICE

PROBLEM TO BE SOLVED: To provide an on-vehicle electronic control device that can keep a vehicle system in operation even if a built-in AD converter fails.SOLUTION: An on-vehicle electronic control device 1 connects with sensors 21-25, and acquires sensor signals output from the sensors 21-25, respectively, through AD conversion. In the on-vehicle electronic control device 1, a CPU 19 executes an anomalous path detection process to detect anomalous paths from among a plurality of transmission paths and a plurality of reception paths. A path selection process is also executed to select at least one from the plurality of transmission paths, excluding the anomalous path, and at least one from the plurality of reception paths, excluding the anomalous path, to be allocated to each of the sensors 21-25.