Today we'll share a case of a failure that makes people feel like they're doing somethingDon't be ridiculousThe 2. 4-l volt engine, the owner of the car, was depressed and said that he was angry with him as soon as he ran off the highway and went into the city. But as soon as we got this car, it was all right, and it tried half a day. It's also clean on the dashboard, without a failure light, and it looks like it's huge。
While there is nothing wrong with it at the moment, we cannot ignore the words of the owner. The owner of the car said he had a “precedent” and had to check for history failure codes. A decisive connection to the diagnostic computer and a direct run-on to the engine system was made to pull a historical failure code p0010 out of the diagnostic computer and to control the failure of the electromagnetic valve of the ingestion cam anxle。
Seeing this failure code, a much more repaired buick's colleagues are probably laughing, because it's the engine that's sick, it's bad, it's bad, and we've done a lot of it before。
But the old onesMaintenance experienceThere's a problem with this electromagnetic valve, which is, at the most, a failure light. It's the first time i've ever met you in a car like this. So it's like, "is it really something? Why don't you believe me
We can't do it without a failure code, we have to look at the data stream, and we're going to pull the data stream at the entry cam。
In this view, the problem is even more obvious. If you step on the gas, the engine turns up and down, the actual number of the entry cam position is as welded as welded, and you stay steady at zero. This means that the electromagnetic valve of the injection cam axis is not working at all, and the instructions to the engine are completely “readable”。
The basic thinking is there, but the exclusion has to be excluded. Given the pressure of the oil on the electromagnetic valve, what if the oil is not enough? Check the machine's feet, the fluid is normal, this is a temporary pass。
The spear points even more at the electromagnetic valve. The next check runs straight to the electromagnetic valve, judging its goodness and badness, and we're going to do it mainly in two ways: a circuit and a barrier。
There are two lines behind the ass, either in gas or in exhausting electromagnetic valves. One is a wire and the other is a pulsed control signal from the engine computer, which is dedicated to directing the electromagnetic valve. How do you judge the line is good? A simple led test light can help. When the engine is running, connects the test light between the signal line and the iron, as if the test light were scintillated in rhythm, which means that the line from the computer to the electromagnetic valve plug is fine and the instruction has reached the “doorway”。
The eight achievements were the damage to the electromagnetic valve itself. We can measure its electrical resistance with a universal watch, and it's an infinity of the electrical resistance of the inlet cam axis to the electromagnetic valve, which means that the internal circuit has been broken. For comparison, we also measured electromagnetic valve resistance on the side of the exhaust, about 13. 5 om. Although it is slightly higher than the factory standard of 8-13 om, it is acceptable, at least it is。
The cause seems clear. In accordance with our experience and the principles of good governance, it is common to replace the "hardy brother" with the "hardy brother" and to save the mood for another one, and the owner has to go again. But after talking to the owner, the owner thought about the cost and decided to try it out。
Then we respect the owner's opinion and replace the new emitter cam axis to regulate the electromagnetic valve. After that, there was still a bit of a lack of heart, with dozens of kilometres of specially designed road tests, the city and the high shelf running, which did not happen again。
The system also displays “no failure code detected”. It seems that this problem has not been repeated at this time。
On the surface, the failure was solved, the car was delivered to the owner and the money was collected. But to tell you the truth, it's all in our hearts. It's nothing. Why
First of all, it's an occasional problem. It's like hiding with you. It doesn't come out when you're looking for it. This test is fine. It doesn't mean 100%。
Secondly, and above all, based on our years of maintenance experience, the damage to the cam axle electromagnetic valves leads to a failure light that is common, but that directly causes the engine to go out, which has not happened. We wonder whether there are other hidden, deeper questions, such as the fact that oil pressure is not enough for a given moment, or that the control logic of the engine computer itself is very delicate and ultimately manifests itself in the form of an electromagnetic valve “back-to-back”? This electromagnetic valve is definitely broken, but is it the cause of the fire? We have a question mark。
Guys, have you ever seen anything like this in a car repair? It's fixed with a failure code and data analysis, but still not true? Do you think this is going to happen again because of the same problem? Welcome to the comment section to share your experiences and views, and let's talk about this inexplicable failure
