Fault phenomenon: the driver said that the urea of the vehicle was not consumed recently, and the instrument reported “abnormal air pressure inside the urea pump”.
Fault analysis: the general instrument report “abnormal air pressure in urea pump” is caused by pipeline or metering pump blockage
1. First, remove the urea nozzle and blow it with the nozzle. If it can be blown through, it means that the nozzle is not blocked.
Then remove the pipe on the injection port of the metering pump and blow it with a mouth. It can be blown through, indicating that it is not blocked of urea pump.
2. The lathe maker C80 diagnostic instrument indicates that the pressure of the metering pump cannot be established, and the metering pump has not completed the pre injection .
It indicates that the instrument report “abnormal air pressure inside the urea pump” is caused by the blockage of the metering pump.
3. Find an unused paper cup, pour purified water and clean the metering pump with a syringe.