Common maintenance methods for electronically controlled diesel engines
1. First outside and then inside
When the engine malfunctions, first check the possible malfunctioning parts other than the electronic control system. This can avoid a fault that is not related to the electronic control system, but the system’s sensors, computers, actuators, and wiring are complicated and time-consuming and laborious. That is, the real fault may be easier to find but not found. .
2. Simplify first, then complex
The possible trouble spots that can be inspected in a simple way are inspected first. For example, visual diagnosis is the simplest. We can use visual inspection methods such as watching, touching, and listening to quickly find out some of the more obvious faults. When the visual diagnosis fails to find the fault, and the diagnosis is carried out with the help of instruments or other special tools, the easier ones should also be checked first.
3. Cook first and grow later
Due to the structure and operating environment, a certain failure phenomenon of the engine may be the most common failure of certain assemblies or components. These common failure locations should be checked first. If the fault is not found, check other uncommon possible fault locations. In this way, the fault can often be found quickly, saving time and effort.
4. Code first
Electronic control systems generally have fault self-diagnosis functions. When the electronic control engine is running, after the fault self-diagnosis system detects the fault, it will store the fault in the computer’s memory in the form of code, and at the same time, the driver will be alerted by warning lights such as “test engine”. At this time, the fault code can be read manually or with an instrument, and the fault location pointed by the fault code can be checked and eliminated. After the fault indicated by the fault code is eliminated, if the engine fault has not been eliminated, or there is no fault code output at the beginning, check the possible faulty parts of the engine again.
5. Think before you act
To analyze the malfunction of the engine first, understand the possible causes of the malfunction, and then check the malfunction. This can avoid the blindness of the fault inspection: it will not make invalid inspections on the parts that are not related to the fault phenomenon, but also avoid the missed inspections of some related parts and the failure to be rectified quickly.
6. Prepare before use
The performance of some parts of the electronic control system, whether the electrical circuit is normal or not, is often judged by its voltage or resistance and other parameters. If there is no such data, it will be very difficult to check the failure of the system, and often it can only be replaced by new parts. These methods sometimes cause a rapid increase in maintenance costs and time-consuming maintenance. Therefore, when repairing this type of vehicle, the relevant repair data of the repaired model should be prepared.
In addition to collecting and sorting out these maintenance data from maintenance manuals and professional books and periodicals, another effective way is to use trouble-free vehicles to measure the relevant parameters of their systems, and record them as test comparison parameters for future maintenance of the same type of vehicles. If you pay attention to this work normally, it will bring convenience to the system’s fault inspection.