Common diagnostic methods for automotive circuit and electrical faults

There are many ways to diagnose automotive circuits and electrical faults. The following car maintenance will give you a summary. As for when to use which diagnostic method, you will know more after reading, and people who do not understand will carefully consider it.
1. Intuitive diagnosis method Intuitive diagnosis method is the first step in the maintenance of automobile electrical appliances, and it is also a simple step. Inspection and troubleshooting depends only on the direct feeling and experience of the inspector. When a certain part of the automobile electrical system fails, abnormal phenomena such as smoke, sparks, abnormal noise, burning smell, and high temperature will occur. Through the sensory organs of the human body, the appearance of automobile electrical appliances can be checked by seeing, smelling, asking, cutting, and smelling to determine the location of the fault. For maintenance personnel with certain experience, some more complex faults can be found, which greatly improves the maintenance speed. For example, when the car is driving, when the turn signal switch is turned on, it is suddenly found that neither the turn signal light nor the turn indicator light is on. Touch it with your hand and feel that the flash relay is very hot, indicating that the flash relay has burned out. When electrical components are working properly, they should have a suitable operating temperature. If the temperature is too high or too low, it means that there is a fault. For example, when the starter is weak, if the battery pole is in poor contact with the wire, it will feel hot when touched.
2. The grounding fire test diagnosis method is a method to judge the fault according to the spark intensity generated by disassembling the wire end of the electrical equipment, which is used to test the metal parts of the car. This method is relatively simple and is a simple and convenient method often used by most automotive electronic and electrical maintenance personnel. Systems using electronic equipment generally do not allow the use of this method, and must be carried out in accordance with certain methods with the help of some instruments and tools. Otherwise, the overcurrent generated by the "fire test" will cause accidental damage to some circuits and components.