Step 1: during the on-site test run, it is found that the vehicle cannot be started and the engine is idling, but it just doesn’t start.
Step 2: use the decoder to read the fault code and display that the system is normal. There is no fault code, but the engine can rotate. The first consideration is the oil circuit. First, use the decoder to check the data flow, focusing on the.
Low rail pressure fault of truck engine, how to check it?
Step 3: the data flow during starting is shown in the figure below. From the data flow, the actual rail pressure is too low and the oil pressure can’t get up at all. Then it’s easy to check. It’s the fault of low and the oil pressure can’t go up.
Step 5: ask the driver to know that the private tanker was filled with oil. It rained heavily the previous two days and the oil cover was not tightly sealed, resulting in rain entering the fuel tank, which was not found by the owner.
Step 6: at this time, it can be determined that the oil nozzle is damaged, so it is found that all 6 oil nozzles are stuck after disassembly and inspection. Clean the oil tank, replace qualified diesel, clean the low-pressure pipeline, replace the diesel filter element, and clean the high-pressure pipeline and its components; Replace the oil nozzle assembly with a new one.
Data flow is very important. If there is no fault code, you can see it through the data flow. Not only to see the data flow, but also to see the data flow, know what to check and what not to check! This is just like “looking, smelling, asking and cutting” in traditional Chinese medicine. Repairing a car is also very similar to repairing a person!
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