Comprehensive customs ruling database

List of contents of this article:

• 1,Comprehensive customs ruling database What are the methods of car fault diagnosis?
• 2, 3, What are the contents of automobile diagnosis and inspection (12 methods of automobile fault diagnosis)
• 4, What are the engine troubleshooting steps

What are the methods of car fault diagnosis?

The common diagnostic methods for automobile faults are mainly as follows: intuitive diagnosis method, self-diagnosis system diagnosis using vehicle faults, simple instrument diagnosis method and special diagnostic instrument diagnosis method.

The basic method of automobile fault diagnosis is to ask the user about the time, phenomenon, current situation, cause of the fault and whether the fault has been overhauled or dismantled, and then preliminarily determine the scope and location of the fault, and then call up the fault code and find out the content of the fault, and repair according to the fault range shown by the fault code. After the maintenance is completed, verify whether the fault has been eliminated.

The fault diagnosis of the technical condition of automobiles is completed through a series of activities such as inspection, measurement, analysis and judgment. The basic methods are mainly divided into two types: intuitive diagnosis and modern instrument and equipment diagnosis.

The first method is to use instrument diagnosis. Modern cars are generally equipped with some electronic devices, such as engine control modules, sensors, electronic control units, etc. These devices can be detected and diagnosed by using professional instruments through the OBD interface connected to the car.

What are the basic methods of electronically controlled engine fault diagnosis

Decoding diagnosis Use The self-diagnosis system of the electronically controlled engine reads the fault code, which is a very important step in the process of diagnosing the electronically controlled engine. The fault code is of great significance to the process of determining and detecting the maintenance direction. There are two ways to read the fault code: manual code reading and instrument diagnosis.

Inquiry: Ask the user about the occurrence of the fault, the conditions, the fault phenomenon and whether it has been overhauled. ( 2) Judge and check whether there is a mechanical failure. If it is a mechanical failure, proceed to step (3), otherwise proceed to step (5).(3) Repair the mechanical faults.

There are two types of instrument diagnosis, one is simple instruments for diagnosis, and the other is to use professional instruments for diagnosis.

What are the contents of automobile diagnosis and inspection (12 methods of automobile fault diagnosis)

The methods of automobile fault diagnosis can basically be summarized into 12: asking method, Test method, observation method, auditory method, test method, touch method, olfactory method, replacement method, instrument method, measurement method, segmented inspection method and partial disassembly method, etc.

The common diagnostic methods for automobile faults are mainly as follows: intuitive diagnosis method, self-diagnosis system diagnosis using vehicle faults, simple instrument diagnosis method and special diagnostic instrument diagnosis method.

The diagnostic methods of automobile faults include inquiry method, empirical method, observation method, listening method and test method. The details are as follows: Question: When the car breaks down, it needs to be diagnosed. When the repairman sees the car for the first time, he should make a preliminary judgment on the shape and service life of the car, so that he can know the shape of the car from the appearance.

What are the engine troubleshooting steps

Engine troubleshooting steps: understand the time and phenomenon of the fault occurrence; use the self-diagnostic mode of the engine management system to diagnose; detail the engine system and components Check carefully to confirm the location and cause of the fault.

Ask the user: the time, phenomenon, situation at that time of the failure, the cause of the failure and whether it has been overhauled, dismantled, etc.Preliminary determination of the scope and part of the fault. Call out the fault code and find out the content of the fault.

The basic process is as follows: (1) Ask the user about the situation of the failure, the conditions of occurrence, the phenomenon of the failure and whether it has been overhauled. ( 2) Judge and check whether there is a mechanical fault. If it is a mechanical fault, proceed to step (3), otherwise go to step (4); repair the mechanical fault.

When the fault light is on, start and turn off the vehicle three times in a row, or you can unplug the negative pole of the engine battery and wait for 30 seconds before connecting it. After completing the above method, check whether the engine fault light on the dashboard is still on.

The basic process is the most basic process of automobile fault diagnosis, and the most general generalization and summary of the diagnostic content.

You should focus on why the engine can't run;Test the fuel system. The diagnosis of the fuel system can be divided into two parts: the diagnosis of the fuel supply system and the diagnosis of the fuel injector circuit system; the detection anti-theft system. The on-board anti-theft system will also produce some frequently ignored failures in the fuel supply system.