What are the reasons for the FAW J6 urea tank not exhausting?

[VanPaul]

The reasons for the FAW J6 urea tank not exhausting include three points: nozzle solenoid valve failure, solenoid valve coil burnout, and nozzle mechanical failure. Below are the specific explanations for the reasons why the FAW J6 urea tank does not exhaust: 1. Nozzle solenoid valve failure: Connector or wiring harness damage causes open circuits, short circuits, etc.; 2. Solenoid valve coil burnout: This can be determined by measuring resistance; 3. Nozzle mechanical failure: Poor quality urea addition or nozzle aging causes urea nozzle wear; Urea crystallization or other particulate matter entering leads to nozzle blockage; Or other reasons cause nozzle deformation, breakage, etc. Below are the solutions: a. Check the urea tank, urea pump, urea pipelines, etc., for any signs of urea leakage; If there is no urea leakage, start the vehicle and keep it running at high power to raise the exhaust temperature to the urea pump; b. The minimum pressure build-up temperature should be 200℃, monitor the urea pump pressure until it stabilizes around 9bar; Do not turn off the engine, keep it idling; Remove the urea nozzle from the exhaust pipe and observe if there is any leakage; If there is leakage, replace it with a new urea nozzle.