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Engine fault code interpretation skills With the development of the automobile industry,international suppliers data the complexity of vehicles is increasing, and the engine fault code has become an indispensable tool for diagnosing automobile faults. The engine fault code is a signal sent by the electronic control module (ECM) or engine control module (ECU) on the vehicle to indicate problems in the engine system. On the dashboard of the vehicle, the fault code of the engine system uses the fault light or the "Check Engine" light to prompt the driver.When diagnosing engine problems, you can read the fault code by connecting the OBD-II interface of the vehicle. OBD-II is the abbreviation of "Automotive Diagnostic Communication Protocol", which is a standardized interface for all modern cars. Using an OBD-II scanner, you can read the fault code. The fault code read from the OBD-II scanner contains a set of numbers and letters, which indicate the problem, and these codes need to be interpreted. The following are some tips for interpreting engine fault codes. 1. Fault code classification Engine systems usually have many fault codes, which can be divided into two categories: P code and U code. The P code stands for "Powertrain Control Module (PCM)", which involves problems with engines, transmission systems and emission systems. These problems may cause the engine to lose power or increase emissions.The U code stands for "network communication failure", which involves the electrical and electronic systems of the vehicle. These problems may lead to the failure of auxiliary systems such as media systems, air conditioners and control modules. Two. The meaning of the fault code. According to the numerical part of the fault code, you can understand the system where the fault occurs. The meaning of the number is as follows: · P0xxx: General electrical and electronic problems involving computer control operation and system monitoring. · P1xxx: It involves emission control issues, including air-fuel ratio and emission system issues. · P2xxx: Involves fuel system problems, including fuel pressurization system and fuel control problems. · P3xxx: involves the engine control system. · Cxxxx: Chassis system problems, including steering, braking and other chassis-related problems. · Bxxxx: Body system problems, including lights, doors, windows, etc.· Uxxxx: Network communication problems, communication problems when transmitting data. The meaning of the letter part is different. You can refer to the interpretation table. 3. The polythem of the fault code should pay attention to the polythem of the fault code. The same fault code may be related to multiple problems. For example, a P0302 code may involve ignition system, fuel system, emission system or mechanical problems, while C1223 can cause failure of ABS, braking system or steering system. Therefore, it is necessary to conduct an in-depth analysis of the interpretation of the fault code. Four. Clear the fault code. If the car fault has been repaired, you need to clear the fault code. By clearing the fault code, you can ensure that the "Check Engine" light goes out and prevent the cleared code from affecting the troubleshooting of future faults. Before clearing the fault code, you should make sure that the problem has been solved, and you should not clear the fault code just to turn off the light.If there is still a fault, the new fault code will be activated. The above are some interpretation techniques for the engine fault code. For ordinary car owners, it is recommended to send them to 4S stores or professional repair shops for processing under the premise of understanding their own professional foundation to avoid further damage.

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