What are the techniques for automotive wiring maintenance and inspection?
1 Answers
Introduction to automotive wiring maintenance and inspection techniques: Comparative replacement inspection method: Replace suspected faulty components with new or well-functioning ones to observe changes in the fault phenomenon and thereby determine the fault. For example, if the coolant temperature indicator on a car shows abnormal readings and the temperature sensor is suspected to be faulty, this method can be used. If the abnormal temperature indication disappears after replacing the sensor, it indicates that the original sensor was damaged. Although this method has the advantage of simplicity, it requires a certain supply of spare parts. Sound inspection method: This involves checking for faults by listening to the sound produced (sometimes momentarily) during the operation of certain electrical assemblies. It is particularly suitable for components that produce sound during operation. For instance, if the starter does not work after turning the ignition switch to the start position, listen for the "click" sound of the starter solenoid switch during the moment of engagement. If the sound is normal, it indicates poor contact or severe burning of the solenoid switch contact plate; if the sound is weak, it suggests a fault in the solenoid coil; if there is no sound, check whether the starter relay can conduct the starting circuit. Test lamp inspection method: For the increasing number of electronic devices in modern cars, the old spark test method should be abandoned in favor of the test lamp inspection. For example, if the electric cooling fan malfunctions, when inspecting the thermal switch, connect one end of the test lamp to the power terminal and the other end to ground. If the test lamp lights up, it indicates normal power supply, and the fault may lie in the thermal switch or fan relay. If the test lamp does not light up, check the fan control circuit, fuses, etc. The test lamp inspection method is suitable for checking power supply in various electrical devices and control circuits.
