The Engine Doesn'T Want To Get Off Work! Maybe The Brain Is
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The Engine Doesn'T Want To Get Off Work! Maybe The Brain Is Short Circuited

  • The difficulty of starting diesel vehicles is not a difficult problem. You old drivers have seen a lot. But have you ever heard of the difficulty of “stalling” the engine? Although the “pull wire” flameout switch is no longer used today, it depends on electronic equipment to flameout. However, there are times when electronic devices are not obedient!

Engine shutdown of too dedicated to work

  • Before listening to an old driver, I encountered such a thing. After delivering the goods to the destination, the vehicle can’t “turn off”! When the key is turned to the off position, the engine is still working normally. Compared with the difficulty of starting, the failure of flameout is rare.
Engine shutdown
  • In the course of the development of diesel engine, the original “pull wire” flameout device has been transformed into flameout after turning off the switch key. This improvement has been applied more and more. There are various forms of design, mainly including controlling the engine flameout by cutting off the engine oil supply, and controlling the flameout by controlling the oil supply on-off and blocking the exhaust. Accordingly, there are more problems.

Engine shutdown: boss, I didn’t get the off-duty signal

Engine shutdown
  • Under normal circumstances, the ECU of the driving computer will officially enter the working state after being powered on, just like a company, all of them enter the working state after going to work. The engine works in a separate office and has been “working overtime” without receiving the boss’s order. The reason for this may be that the controller ECU has not received the signal to let the engine off duty.
Engine shutdown
  • If the ECU cannot receive the power-off signal, this kind of fault is actually a general circuit fault. If an old driver with experience in this field can try to check whether the working voltage of the activation circuit is normal. Insufficient circuit voltage or string of wires may cause the ECU to not receive the off-duty signal.

Engine shutdown of create the illusion that the engine will work overtime

  • Similarly, for example, when it’s time for a company to get off work, the boss is still in the office and other colleagues are still working. The engine will create an illusion. I ca, do you have to work overtime today?
Engine shutdown
  • Because many cars have such a setting for safety, that is, when the vehicle is running and the key is turned off, the engine will not shut down and can still drive normally, in order to ensure the safety of driving. There is no problem with such a security policy.
  • When the vehicle cannot be turned off, we can consider the fault reason in this regard – ECU receives an error signal. This wrong signal may be the fault of the vehicle speed sensor. When our vehicle has stopped steadily, but ECU receives the wrong signal and thinks that the vehicle is still running normally, so the engine will have the illusion that we are not off duty, and we must not leave work in advance.
Engine shutdown
  • According to a previous test, it was mentioned that in addition to the wrong signal that may appear in the speed sensor at the front of the tractor. In another case, the trailer may also send the wrong signal. In fact, there is signal communication between the ABS of the trailer and the main vehicle.
    In the ABS system, most of the inductive sensors monitor the vehicle speed. The ABS sensor outputs a group of quasi sinusoidal AC signals through the action of the ring gear rotating synchronously with the wheel, and its frequency and amplitude are related to the wheel speed. In other words, if the output signal fails, the ECU will also receive the wrong wheel speed sensing signal.

Engine shutdown of failure of shutdown solenoid valve without command

  • In addition to the above situations, there is also the fact that the shutdown solenoid valve cannot effectively execute the command after the ECU gives the “off duty” signal, which will also lead to the difficulty of engine flameout. However, the probability of such failure is not high.
Engine shutdown
  • After receiving the off-duty command, the shutdown solenoid valve cannot effectively disconnect the oil circuit due to its own fault. As a result, fuel will continue to enter the engine, causing the engine to stop immediately. In fact, most of these failures come from the quality of diesel fuel and the manufacturing process of solenoid valve.
  • Although it is not common for the engine to shut down, these phenomena still exist objectively. To sum up, most of the reasons for the difficulty of flameout are circuit signal faults, which can be easily solved by patient inspection. In fact, here we have to talk about an old topic. The car is like your own friend. He will treat you as you treat him. Daily maintenance is the basis to ensure the efficient work of the car, and the cart is also a car.
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