Patent ID: 6970807

Claim:
A diagnostic system which performs a diagnosis of operating performance of an electric leak detecting device, in a power supply unit including a battery, a motor which is driven by the battery, an electric power converting device which is provided between the battery and the motor, a simulated electric leak generating device which generates an electric leak state between the battery and a vehicle body, and the electric leak detecting device which detects a simulated electric leak, comprising: an opening/closing device which connects/disconnects the electric power converting device to/from the battery; and an opening/closing detecting device which detects opening/closing of the opening/closing device and which outputs a result of detection to the simulated electric leak generating device and the electric leak detecting device, wherein the electric leak detecting device performs at least one of retry and temporary suspension of both generation of a simulated electric leak and detection of an electric leak, when opening/closing of the opening/closing device is detected by the opening/closing detecting device.