What to Do About Automotive Electrical Circuit Failures?
1 Answers
Solutions for automotive electrical circuit failures are as follows: 1. Visual Diagnosis Method: When an electric vehicle's circuit fails, abnormal phenomena such as smoke, sparks, unusual noises, burning smells, or overheating may occur. These phenomena can be detected through human senses (sight, hearing, smell, touch), allowing direct identification of the faulty area. 2. Open Circuit Method: If a short circuit (ground fault) occurs in the electric vehicle's circuit equipment, the open circuit method can be used. By disconnecting the suspected circuit section, observe whether the ground fault persists in the electrical equipment to determine the location and cause of the fault. 3. Short Circuit Method: For open circuit faults in an electric vehicle's circuit, the short circuit method can also be employed. Briefly connect the suspected open circuit section and observe changes in instrument pointers or the operational status of electrical equipment to determine if an open circuit fault exists. 4. Test Light Method: This involves using an electric vehicle bulb as a test light to check for open circuit faults in the circuit. 5. Instrument Method: Monitor the readings on the electric vehicle's dashboard (e.g., ammeter, water temperature gauge, fuel gauge, oil pressure gauge) to identify potential circuit faults. 6. High-Voltage Spark Test Method: Perform a ground spark test on the high-voltage circuit to observe spark conditions and assess the ignition system's performance. The specific method involves removing the high-voltage wire from the ignition coil or spark plug, positioning it about 5mm from the spark plug or cylinder head, then activating the starter switch while turning the engine to observe spark quality. A strong, blue spark with a loud snapping sound indicates normal ignition system operation; otherwise, the system is faulty. 7. Low-Voltage Ground Spark Test Method: Disconnect one terminal of the electrical device's wiring and touch it to the vehicle's metal part (ground) to generate a spark for fault diagnosis. This simple method is commonly used by electric vehicle electricians. Ground spark tests can be categorized into direct and indirect grounding. Direct grounding produces a strong spark without passing through any load.
