Malfunction-diagnosing apparatus

Abstract

A malfunction-diagnosing apparatus includes an alternator and a controller. The controller is configured to diagnose a malfunction of the alternator. The alternator includes a power generator configured to generate an alternating-current voltage by using motive power output from an engine, and a rectifier configured to rectify the alternating-current voltage into a direct-current voltage. The rectifier includes a field-effect transistor, and a diode coupled in parallel to the field-effect transistor. The controller is configured to diagnose the malfunction, based on power generation efficiency of the alternator.

Dependencies are inferred from the claim text.