1. Check the oil circuit pressure, the oil pump is working normally, and the return oil pressure of the oil circuit is normal. 2. Check the fuel filter assembly and whether there is air leakage in the oil circuit, and check whether it is normal. 3. Check the circuit to see if the relay is broken and whether the circuit is worn or not, and the inspection is normal (the control line and the relay have been replaced). 4. Replace the main process module to see if there is any problem, and the inspection is normal. 5. Check and replace the sensor, and the inspection is normal. 6. It is suspected that it is a problem with the injector assembly. Because the generator set has an automatic detection and alarm function, if there is a problem with the injector, a corresponding fault code will appear. 7. Check the fuel injector relay voltage, because it is a pulse, it cannot be measured with a multimeter, and the result. Therefore, it is impossible to determine whether it is an electrical problem or an injector problem.The machine will enjoy one year warranty or 1000 running hours whichever comes first . During the warranty year if any of the parts broken not by man-made .  We will free charge to replace the new one to you . The warranty will begin after the machine send out we received  the B/L. Payment:  1: T/T and Western Union are accepted 2: 30% deposit before production and 70% balance before shipment 3: All banking charges outside China are on buyers1. Check the oil circuit. 2. Plug in the inspection instrument, and then use gasoline at the air intake to help the engine. After-sales test results: Fuel pressure loss Injector instability. Processing result: replace the injector assembly and readjust the exchange rate of 6 injectors. Therefore, it is judged that the fault code is displayed, and there is a problem with the injector, which cannot cause a fault alarm.