What is the cause of high rail pressure of the diesel engine in China III and how to solve it?

Directly, you see that there is an electrical component on the oil pump, which is called the fuel pump actuator, you first go to the service station and ask them to check whether the actuator is broken. If not, then you can change the oil pump.

Because the fuel pump actuator is a part that directly receives ECM control to adjust the pressure of the fuel rail, if the pressure of the fuel rail is too high, it is eighty percent of his fault.

Possible causes: ECU control problems (the probability of ECU problems in regular manufacturers is very small), the wiring harness connected to the pump is subject to electromagnetic interference or broken, or it is normal, resulting in the pump solenoid valve being fully opened, and the rail pressure will be too high. Or the pump solenoid valve is stuck in the normally open position (impurities in the oil, etc.), which will also cause the valve to be normally open and the rail pressure to be too high.

It may be that there is a problem with the oil metering unit on the diesel pump, and the oil metering unit cannot be replaced separately.

The rail pressure calculation of the high-pressure common rail is calculated by the speed and throttle signal, the oil output of the oil pump is controlled by the solenoid valve on the oil pump, and the closed-loop control is formed through the rail pressure sensor.

If the rail pressure is too high, it is recommended to check the calibration data first, whether the rail pressure calibration data is abnormal, and whether there is any abnormality in the compensation amount of the rail pressure. If the calibration data is normal (compared with the map of the speed and throttle signal), you can check whether the signal of the rail pressure sensor is normal.

If everything else is normal, the problem may appear on the metering solenoid valve, which can be troubled by changing the pump.

Regarding the fault measurement of solenoid valves as well as sensors, if you are interested, we can find it in **.

What is the cause of high rail pressure of the diesel engine in China III and how to solve it?

There are many reasons for the high rail pressure of Sanchai residual limb oil machine, the most common of which is the wear of the piston ring and the piston ring seat, the loosening of the piston ring and the piston shaft ring seat, the deformation of the piston ring and the piston ring seat, the defect of the piston ring and the piston ring seat, the damage of the piston ring and the piston ring seat, the uneven pressure of the piston ring and the piston ring seat, etc. The solution is to replace the piston ring and piston ring seat, and check the pressure of the machine regularly, and if the pressure is found to be too high, repair it in time.

What is the cause of high rail pressure of the diesel engine in China III and how to solve it?

Hello, the above questions will be answered by me. Causes and solutions for excessive rail pressure of diesel engines in China 1Diesel rail high pressure is:

High-pressure oil circuit problems, common rail pressure relief leakage valve problems, metering unit problems, high-pressure pump problems. 2.The flow unit is the same as the injector, which is the actuator of the common rail.

It is integrated mounted on a high-pressure oil pump. Real-time and accurate control of the oil volume entering the common rail pipe realizes the adjustment of the fuel pressure by the high-pressure bright search vertical pump. 3.

The common rail diesel engine stores stable pressure in the oil rail to ensure that the fuel injection pressure of each cylinder is consistent. Achieve good combustion consistency and stable power output of each cylinder. Hope it helps!

Summary. Hello, I am your exclusive technician, attentive, careful, dedicated to answering your car questions, for you to find the corresponding problem solutions and solutions!

The problem of high-pressure oil pumps is generally the acceleration of the country.

1.A diagnostic computer is required to read the data of the high-pressure rail.

2.The specified value of the data on the track is greater than the actual one, which only indicates that the actual rail pressure is low. Repair the high-pressure oil pump.

3.Check the amount of oil returned to the injector. If the amount of oil return is large, it will also affect the rail pressure.

What is the reason for the rapid acceleration of the National VI diesel engine and the low pressure of the orbit.

Hello, don't click to end, I'm textual to give you the full answer, 2-3 minutes.

Hello, I am your exclusive technician, attentive, careful to judge the heart, concentrate on answering your car questions, reputation for you to find the corresponding problem solutions and solutions! The problem of high-pressure oil pumps is generally the acceleration of the country. 1.

A diagnostic computer is required to read the data of the high-pressure rail. 2.The specified value of the data on the track is greater than the actual one, which only indicates that the actual rail pressure is low.

Repair the high-pressure oil pump. 3.Check the amount of oil returned to the injector.

My car is as long as a stop to accelerate the code speed limit, jogging 140 yards is no problem, I changed the oil rail and nitrogen oxygen sensor, the air flow does not work, I disconnect the low-pressure oil direct oil supply is the same I am now suspicious of the DPF and Jian Yinchun circuit problems, I don't know what else the teacher has to see the hail, thank you!

If the dp f is blocked, the computer will report a malfunction. Use the diagnosis and banquet to read the high-pressure oil rail data. The large deviation between the specified value and the actual value is the problem of the oil vertical slag pump.

When there is a fault code, the data flow will drop by half, but I turn off the key and turn it on again at this time, the engine is not turned off, at this time the rail pressure data is normal again, and the fault code has changed from the current to the historical fault code, this problem I have checked for a long time and there is no result of Zheng Zheng, and now I don't know where to start.

The fuel tank can be cleaned, and I encountered a fault like this, and the inside of the fuel tank is clogged.

Eighty percent of metering units and rail pressure sensors are faulty: replaced.