Circuit faults can usually be divided into four main types. An open-circuit fault refers to an abnormal disconnection in the circuit that causes current interruption, such as a broken wire or poor contact. A short-circuit fault occurs when two points of different potentials are shorted by a conductor, resulting in an abnormal increase in current, which may cause equipment damage or fire. A connection fault involves incorrect connection sequence or missing/redundant connections of components, such as chaotic wiring in control circuits leading to equipment failure to operate as intended. Troubleshooting these faults requires the use of professional tools and methods, such as employing a multimeter to test continuity and voltage, and performing segmented measurements to narrow down the scope. For automotive circuits, special attention should also be paid to common issues such as aging wire harnesses and oxidation of connectors. Regular inspection of circuit insulation performance can prevent faults from occurring.
