Motor circuitsWhat are the methods for overhauling? The most common breakdowns in motor circuits are break-ups, short circuits, damage to electrical equipment, etc. To enable rapid and accurate diagnosis of failures, several common methods of overhaul are described below。
I. Intuitive diagnosis
Unusual phenomena such as smoke, sparks, acoustic noise, smell, heat and so forth sometimes occur when car circuits fail. These phenomena can be observed directly, so that the area of the malfunction can be judged。
Short-circuit laws
Broken circuits in the vehicle circuits can also be judged by short circuit methods, i. E., short circuits suspected of faulty with an opening or a guide, changes in the gauge indicator or working condition of electrical equipment, thereby determining whether there is a breakout in the circuit。
Iii. Breakout law
In the event of iron-laying (short-circuit) failure of the vehicle's circuit equipment, it can be judged by the breakout method, which is to observe the presence of iron-linking in the electrical equipment following the break-up of the sections suspected of having a fault, in order to determine the location and cause of the wire-laying。
Iv. Structure
To observe the current, water temperature, fuel, oil pressure tables, etc., on the car dashboards and to determine whether the circuits are malfunctioning. For example, when the engine is cold and connects to the ignition switch, the water temperature gauge indicates that the water temperature gauge sensor has malfunctioned or the line is ironed。
Test light method
A test light is used in a car as a test light to check for circuit failure。
High pressure test fire
High-voltage circuits are subjected to iron tests to observe the state of electrical sparks and to determine the performance of the ignition system. This is done by removing a high-pressure steering line from the firering ring or spark plug, pointing it at, for example, the spark plug or the cap of the tank, at a distance of about 5 mm, and then connecting to the start switch, turning the engine and seeing how it jumps. If the spark is strong, it is sky blue, and the sound of jumping is high, it indicates that the ignition work is generally normal and, conversely, that the ignition work is abnormal。
Vii. Low-pressure test fire
That is, sparks are created to judge the metal parts of the car (on iron) from a line that removes the electrical equipment. This method is relatively simple and is frequently used by a large number of car electricians and can be divided into direct and indirect iron. The so-called direct iron-laying is a spark that produces a strong spark without being loaded. For example, we need to determine whether a circuit between the ring of ignition and the battery is malfunctioning, to remove the wire of ignition from the ring of ignition that connects the ignition switch, to scratch on the body of the car or on the frame of the car, and to indicate that the circuit is normal if there is a strong spark; if there are no sparks, this means that the circuits in this paragraph are broken. Indirect iron lifts are used to determine whether the line or load is broken through a small spark created by a load of car appliances. For example, the connection of traditional ignition systems to electrical appliances is ironed (the circuit passes through the primary ring of ignition) and, if there are sparks, the line is normal; if there are no sparks, the circuit is broken. Of particular note is that the test fire method cannot be applied on electronic circuit cars。
