Automotive electronically controlled engine maintenance key points Automotive CAN bus simulation development tool

Main points of maintenance of automobile electronically controlled engines The development and promotion of automobile fault self-diagnosis systems have made the troubleshooting and maintenance of electronically controlled engines easier to a large extent. Generally speaking, maintenance personnel can accurately determine the fault situation based on the fault code. In specific fault diagnosis, there are still some imperfections in determining fault phenomena based solely on fault codes. We should also conduct a comprehensive evaluation of the electronic system, so that we can find the fault problem more accurately. When diagnosing and repairing automobile electronically controlled engine faults, you must pay attention to the following points:
After an electronically controlled engine fails, if it is a mechanical failure, empirical methods can be used to directly inspect and eliminate it.
Before reading the fault code of the electronically controlled engine, a basic inspection of the engine should be carried out, that is, the basic idle speed and basic ignition timing should be detected and adjusted to ensure that the engine is in a suitable state for inspection. Reasonably adjust the basic inspection methods and steps according to the vehicle type. If during the actual inspection, specific requirements are given for the opening and closing status of additional electrical equipment, coolant temperature, radiator and cooling fan operation, the relevant maintenance information must be adhered to during the actual operation.
When choosing a fault self-diagnosis system for troubleshooting, you should master the detailed information of this model, such as the meaning of the fault code, the reading method, the basic parameters of the engine electronic control components, the workpiece performance parameters, etc. You must have an in-depth understanding of Mastery is the prerequisite for improving fault repair efficiency.
The circuit of the electronically controlled fuel injection system is the same as other electronic circuits. They all have circuit characteristics, that is, voltage and resistance characteristics with their own operating characteristics. For example, the different operating voltages on each terminal of the wiring harness connector have different resistance values between each controlled circuit and the sensor and actuator terminals. Therefore, when there is a lack of car-specific fault detection instruments, you can choose a multimeter to measure the voltage value of each terminal of the wiring harness connector and the resistance value between each other, so as to initially determine the fault.
When using a multimeter to test the control circuit, the specific maintenance data of the target model should be used. For example, the specific names of the sensors and actuators connected to each terminal in the automobile engine wiring harness connector, the connection diagram, the standard voltage values of different terminals in various engine states, and the standard resistance values between each terminal, etc. Only by mastering the maintenance technical data of the vehicle model can the occurrence of human fault codes be avoided as much as possible. Another issue that should be paid attention to is that the ignition switch must be turned off before troubleshooting. If electronic components need to be replaced, the new components must be tested before replacement. When performing fault repairs, the fault phenomenon should first be confirmed, and then the fault location and location should be gradually found. Identify the cause and finally take targeted maintenance measures. Many times there is more than one fault in an electronically controlled engine. After a certain fault is rectified, other faults will gradually surface. Therefore, it should be carefully and repeatedly inspected to ensure that the fault is completely eliminated.