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Accident phenomenon: Recently, the driver of the car said that the car did not consume urea, and the instrument showed "abnormal air pressure in the urea pump".

Accident analysis: generally, the reported "abnormal gas pressure in urea pump" is caused by the blockage of pipeline or metering pump.

Troubleshooting procedures of beiben V3 accessories manufacturer:

1. First remove the urea nozzle and blow it hard with the nozzle. If it can be blown through, it means that the nozzle is not blocked.

Then disassemble the pipe on the nozzle of the metering pump and blow it with your mouth. It can be blown through, indicating that it is not blocked.

2. The diagnostic instrument indicates that the pressure of the metering pump cannot be determined, and the metering pump has not completed the pre injection.

It indicates that the instrument report "abnormal air pressure in urea pump" is caused by the blockage of metering pump.

3. Find a unused paper cup, pour out pure water and clean the metering pump with a syringe.

Inject the water into the injector through the liquid inlet of the metering pump, and do not finish until there is water flowing out of the liquid return port of beiben V3 fitting (the car is not blocked badly, and a glass of water is drunk). It was feared that the blockage of the metering pump was caused by the dirty urea solution, so the user was advised to replace the urea solution at that time.

4. With the consent of the user, beiben V3 accessories will discharge the remaining urea solution in the tank and put it into a clean barrel.

At this time, it was found that there were many black particles floating in the solution. No wonder the metering pump would be blocked.

Disassemble the urea tank, wash it with tap water, then clean it with barreled purified water, and then add urea solution for cleaning to eliminate the fault.

Analysis and conclusion

After careful identification, the floating matter in the urea solution should be the urea residue left during processing and punching. At the same time, the urea tank was not cleaned well during loading.

After adding urea solution, the debris will be suspended in the solution, so when the metering pump works, the metering pump will be sucked into the pump, causing blockage. Therefore, the cleaning of the urea tank itself is also very important, and impurities and debris cannot be carried, so as not to pollute the solution.

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