Help with manual diagnosis of car breakdowns?

Manual empirical diagnosis: that is, intuitive diagnosis, which is characterized by the fact that it does not require a lot of equipment, can be carried out in any situation, and the accuracy of diagnosis depends to a large extent on the skill level of the diagnostician. Due to the characteristics of wide use, large volume and dispersion of automobiles, it is more suitable to adopt this diagnostic method.

For example, observe the color of the engine exhaust, the exhaust gas is black when the fuel combustion is incomplete, the exhaust gas is blue when the oil is wound on the cylinder, and the exhaust gas is white when the oil is leaking.

1."Looking" part "Looking" is to observe each part of the car with the eyes or with the help of a magnifying glass, endoscope, etc., to see if there is any abnormal phenomenon and find clues of failure. This is the most widely used, the most basic, and the most effective fault diagnosis method.

2."Touching" parts "Touching" is to feel the temperature, pressure, vibration, etc. of the parts by hand, so as to obtain the fault information of the car.

3."Listening" sound "Listening" is to listen to the sound of the car through the hearing of the ear or with the help of a stethoscope to determine the location of the fault.

4."Smell" Smell "Smell" is the perception of abnormal odors produced by various parts of the car through the sense of smell of the nose.

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Cars are already a must-have tool for everyone to get around. Of course, automotive knowledge is essential. In order to make it easier for everyone to understand these knowledge, today, Bian Xiao will introduce to you what the manual diagnosis method of the car is.

Interested friends can learn about it, it may be helpful to you.

Automobile manual diagnosis method refers to the diagnostic method with rich practical experience and necessary theoretical knowledge of the cause and local location of automobile problems with the help of simple detection methods such as eyes, ears, hands, and nose to detect, test, analyze and determine the diagnosis. Manual experience diagnosis is the traditional and basic method of diagnosing automotive problems. Even with the rapid development of modern instrumental diagnostic technology, manual empirical diagnosis may not be replaced.

According to the complexity of automotive diagnostic technology and the development level of automotive technology, diagnostic methods can include manual experience diagnosis, simple instrument diagnosis, precision detection diagnosis and artificial intelligence diagnosis. Manual diagnosis: Before the 50s, the structure of the car was simple and there were few electrical equipment, so the problem diagnosis could be completed by manual experience.

At present, manual empirical diagnosis methods are still very effective in the diagnosis of some complex problems. Simple instrument diagnostics: From the beginning of the 50s to the end of the 70s, as the structure of the car became more and more complex, the number of electrical devices gradually increased.

Therefore, in the process of diagnosing automotive problems, it is necessary to check the relevant assemblies and components with the help of vacuum gauges, pressure gauges, multimeters and oscilloscopes to determine their technical status. Precision detection and diagnosis: From the early 80s to the early 90s, with the increasing degree of automotive electronics, there were more and more dynamic random problems and functional problems of the adjustment system.

Various precision detection methods with computer technology as the core have been widely used, which has greatly improved the level and accuracy of automobile condition detection and the accuracy of problem diagnosis. Such as various engine analyzers, computer testing instruments and various electronic testing instruments. Basically, it is an indispensable instrument for precision inspection.

Manual diagnosis: Since the 90s, there has been an increasing number of electronic devices in automobiles, and the models and their tuning techniques are not very similar. Therefore, problem diagnosis becomes a key issue in car maintenance.

Various systems developed by applying the theories and technologies of artificial intelligence and modern information technologies will facilitate the diagnosis and solution of problems.

Outside first, then inside. When an engine fails, first inspect the parts outside the electronic control system that may be faulty. In this way, failures that are not related to the electronic control system can be avoided.

However, inspecting a system's sensors, ECUs, actuators, and circuitry is complex, time-consuming, and laborious, and true faults can be easily spotted but not discovered.

Parts that can be faulty that can be inspected in a simple way should be inspected first. For example, visual inspection is the easiest. You can tell if the spark plug and injector are working by looking (with your eyes to see if the wiring is loose or broken, whether the oil circuit is leaking, whether the intake pipe is damaged or leaking, etc.).

or touch (touch the joint connection of the suspicious line with your hands, touch the temperature of the spark plug and the vibration of the injector, touch the connection of the line to determine whether the contact is poor, etc.) ), listen (listen for air leaks, abnormal engine noises, regular clicking of injectors, etc.) ) and other intuitive inspection methods to quickly identify some obvious faults.

When a visual inspection fails to detect a fault and it needs to be checked with the help of an instrument or other specialized tool, it is also necessary to check for early faults that are easier to detect. Check the items that can be checked by the car first.

Due to reasons such as structure and use environment, some faults of the engine may be the most common failure of some assemblies or components. Check these common fault parts first, and if no fault is found, check other abnormal and possible local fault parts. In this way, the fault can often be shipped quickly or now, saving time and effort.

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Automobile failure refers to the phenomenon of the loss of the prescribed function of the system, assembly and parts of the car or the whole body. According to the severity and relevance of the impact of the fault on the performance of the car, it is divided into four categories: fatal fault, which refers to the fault that endangers driving safety, leads to **, causes the scrapping of the main assembly and major economic losses or seriously endangers the surrounding environment.

Related Notes:

Serious failure refers to the fault that affects driving safety and causes serious damage to the main parts and components, or the performance is dull and deteriorating, and cannot be eliminated in a short time (about 30 minutes) with easy-to-replace spare parts and on-board tools. General faults lead to the suspension of the car and the decline of performance, but generally do not cause damage to parts and assemblies, and can be eliminated in a short time (about 30 minutes) by replacing wearing parts and on-board tools. Minor faults, generally do not lead to car shutdown and performance degradation, no need to replace parts, with the on-board tools can be easily eliminated (5 minutes).

According to the cause of failure, it can be divided into structural failure due to structural problems; manufacturing failures caused by violations of manufacturing processes or imperfections in processes; Failures caused by violation of the use regulations (such as overload, fuel moisturizing material not meeting the regulations, failure to complete technical maintenance in time, etc.).

According to the characteristics (regularity) and likelihood of failure, it is divided into gradually developing faults (such as failures caused by wear) and sudden Chaling faults (such as sudden fractures caused by fatigue of parts and materials). The technical condition parameters of the former are stable and changeable, so they can be prevented through timely technical maintenance; The latter can happen at any time and is difficult to **.

According to the fault mileage, it is divided into short mileage fault (< 1500 2000km), medium mileage fault (1500 2000km1, "fault mileage<8000 12000km) and long mileage fault (>8000 12000km).

Hello Car breakdown refers to the phenomenon of partial or complete incapacity of the car. According to the degree of incapacity, car breakdowns can be divided into local breakdowns and complete breakdowns. Local failure refers to the failure of the car to partially lose its ability to work and reduce the performance of the car due to tightness, but it can still drive, such as the failure of the engine to emit black smoke and poor acceleration.

A complete failure is a failure in which the car is completely incapacitated, resulting in the car not being able to drive, such as the engine not being able to start steering or the brakes failing.

During the car repair process, it is necessary to diagnose the car fault. What is a car fault in the process of car maintenance, it is necessary to diagnose the car fault, what is a car fault? Nowadays, the degree of electronicization of automobiles is very high, and every car with socks has a computer, so if you want to check the fault of the car, you can use the computer to check the fault of the car.

A car breakdown is a phenomenon in which a car is partially brightened or completely incapacitated. According to the degree of loss of workability, Jing Gelu car failure can be divided into local failure and complete failure. Local failure refers to the failure of the car to partially lose its ability to work and reduce the performance of the car, but it can still drive, such as the failure of the engine to emit black smoke and poor acceleration.

A complete failure is a failure in which the car is completely incapacitated, resulting in the car not being able to drive, such as the engine not starting the steering or the brakes failing.