How to Diagnose Automotive Circuit Faults?
1 Answers
Common troubleshooting methods for automotive circuit faults: Common automotive circuit faults mainly include: open circuits, short circuits, electrical equipment damage, etc. To quickly and accurately diagnose faults, here are several common maintenance methods. Visual diagnosis method: When an automotive circuit malfunctions, sometimes abnormal phenomena such as smoke, sparks, abnormal sounds, burnt smells, or overheating may occur. These phenomena can be directly observed to determine the fault location. Short circuit method: When an automotive circuit device experiences a grounding (short circuit) fault, the open circuit method can be used for judgment. That is, after disconnecting the suspected faulty circuit section, observe whether the grounding fault still exists in the electrical equipment, thereby determining the location and cause of the circuit grounding. Open circuit method: If an open circuit fault exists in the automotive circuit, the short circuit method can also be used for judgment. That is, use a screwdriver or wire to short-circuit the suspected open circuit fault section, and observe changes in the instrument pointer or the operation of the electrical equipment to determine if an open circuit fault exists. Test lamp method: The test lamp method uses an automotive bulb as a test lamp to check if an open circuit fault exists in the circuit. Instrument method: Observe the indications of the ammeter, water temperature gauge, fuel gauge, oil pressure gauge, etc. on the automotive dashboard to determine if there is a circuit fault. For example, when the engine is cold and the ignition switch is turned on, if the water temperature gauge indicates full scale without movement, it indicates a fault in the water temperature sensor or a grounding in the circuit.
