Suction control valve fault symptoms

The suction control valve is the executive part that manages the gas amount in the high-pressure common rail, which is regulated by ECU. When the Suction control valve fails, the fault light will certainly light up.Suction control valve mistake symptomsEngine stallSuction control valve fault symptom oneAfter the suction control valve is damaged as a result of maturing as well as other reasons, fuel shot can not take place, and the fuel does not flow with the valve core as well as straight gets in the high-pressure gas pump, causing the engine to unexpectedly stop.Check: Disconnect the suction control valve to check whether there is any type of deformation, blockage, etc. If there is no worry, check the o-ring rubber condition. If the o-ring rubber problem is harmed, you can replace it with a new one, and also reinsert it to start.Suction control valve fault symptom twoWhen the control line is short-circuited to the ground, the engine will certainly be switched off promptly, and also the engine will certainly be restricted torsion if the rail pressure is too high.Suction control valve fault sign threeThe low end of the suction control valve is short-circuited to the ground: the 3.5 V control line is based. As soon as this control line is short-circuited to the ground, the ECU will not be able to continue to control the suction control valve. At this time, the current of the suction control valve will reach the maximum value, so the normally open suction control valve oil passages will certainly be entirely closed, and also the lorry will certainly reveal an immediate flameout. The failing phenomenon.Check: Pull out the suction control valve, turn the ignition switch to the ON setting, and also determine the voltage of the two pins to the ground. Typically, one is 24V and also the other is about 3.3 V. If there is no voltage, the circuit is broken.Plug in the suction control valve, pierce the pin from the back end, measure the voltage of both pins to the ground, under typical circumstances, the voltage is 24V, start the test, where the drive line need to be about 0.3 V. Examine the resistance of the oil suction control valve, the regular value is 2.6-3.2 ohms.The engine is tough to runSuction control valve fault signs and symptom oneSuction control valve open circuit failure: the high and low ends of the joint are open, or the line plug is not plugged in well, as well as the get in touch with is poor, which will certainly cause an open circuit failure. Right now, there is no current in the suction control valve as well as the spool is at the optimum oil supply placement; Suction control valve fault symptom twoSuction control valve short-circuit fault: the premium and low-end of the joint are short-circuited. At this time, the suction control valve itself loses present and the spool is additionally at the maximum oil supply setting; Suction control valve fault sign threeThe high end of the suction control valve is short-circuited to the ground: At this time, the suction control valve itself will additionally lose current, that is, the suction control valve no longer does work, and also the spindle is additionally at the optimum gas supply placement; The event of the above 3 problems will certainly create the stress in the common rail pipe to be too expensive. At this time, it will trigger the common rail stress limiting valve to open and launch the stress. When the typical rail pressure restricting valve falls short to open, the engine will be limited in torque, showing a failing phenomenon of driving weakness.Pressure detection alike rail pipeCheck whether the low-pressure oil circuit is leaking or blocked (tighten up the hoops of all pipelines, check whether there are folds up, whether the fuel storage tank is open to the atmosphere, as well as whether the submarine pipe in the gas tank is blocked by contaminant). Inspect the fuel return quantity of the gas injector. Under regular scenarios, the fuel return does not surpass the steel plane on the U-shaped card of the gas injector.Check the fuel shot volume of the fuel injector. You can take the fuel injector out and also attach it out. If the fuel injector is leaking during the startup process, the injector needle valve might be embeded an open state. Note: For the typical opening and shot conditions of the injector, the rail stress have to be more than 25M. Check whether the oil pump pressure safety valve is embeded an open state, it can be taken apart as well as cleaned.Suction control valve fault symptom fourIt is really important to avoid the high rail pressure triggered by the sticking of the spindle. It is necessary to make use of professional fuel oil and diesel filter.The spool is stuck. For example, when the lorry is slowing down and going downhill, the engine will certainly get in the slowdown cut-off setting, that is, it will certainly remove the fuel supply of the injector, and the suction control valve solenoid valve need to be entirely shut at this time to prevent the oil pressure in the typical rail pipeline from continuously increasing. Nonetheless, if the valve core in the suction control valve is stuck at this moment, the gas will continue to go into the common rail pipe, and also the oil stress will certainly continue to increase, creating the stress limiting valve to be forcibly opened up, and also the engine gets in the defense state. When the rate is restricted, it will likewise show the sensation of driving weakness.The interior valve core of the gas suction control valve is stuck or worn too soon. A lot of it is brought on by excessive impurities in the gas. Consequently, in addition to refueling at a routine filling station, you need to also utilize a qualified diesel filter to guarantee yourself The components on the lorry can be utilized for a longer life.Severe idlingThe constant opening time is too long and the system stress is too expensive, which will certainly trigger the engine to go into the reliable mode, in which the engine power is restricted. At the same time, driving weak point occurs.If the Suction control valve falls short, change it in time. Inferior Suction control valve has a much shorter service life and poor usage effect. When it experiences inferior diesel, it might collapse right away. When there is a trouble with the suction control valve, exactly how to spot the issue with the suction control valve and whether it requires to be replaced in time.