When you turn on the ignition, the Check Engine light does not come on, or it lights up but goes out before the engine starts! In this article, I will tell you in detail about the reasons for this malfunction and give my recommendations on how to eliminate it.
According to the instructions, the “check engine” light should light up when the key is positioned 180 degrees in the ignition switch, and then, after starting the engine, go out. But it happens that in various situations it stops burning even before the engine starts.
Why doesn't the Check Engine light come on?
So, the check must light up as soon as the vehicle’s SZ is turned on, and go out as soon as the engine starts. This indicates normal operation of the vehicle. Otherwise, if the check light comes on while driving or does not respond at all, diagnostics are needed at a service station.
First, let’s find out what the purpose of the indicator is. It turns out that the check translated from English literally means “check engine.” In other words, if the indicator lights up while the vehicle is moving, it means that the car’s ECU is sending a clear signal to the driver that there is some kind of malfunction in the operation of the internal combustion engine.
Unfortunately, the ECU is not capable of specifying the problem. On the other hand, if you know which systems the check is responsible for, you can draw the appropriate conclusions.
In the previous article, I already managed to tell you about why the Check Engine light is constantly on.
It will not be so difficult to find the cause of the malfunction if the indicator does not light up after turning on the SZ. The driver got behind the wheel of the car, turned the key half a turn - the indicator should light up. If this does not happen, you need to try to test a few things yourself.
What does it mean?
Now many owners of iron horses already know what a small yellow or orange light bulb of a characteristic shape on the dashboard means. If translated literally, check engine sounds like “check the engine.” Therefore, it should warn the driver about malfunctions of the motor unit. That is, the computer on board detected some kind of malfunction in the operation of this compartment.
Normally, when you start your car, this light goes out immediately when you start the engine. And when the key is inserted into the ignition, but the engine is not started, it should light up. But sometimes just the opposite happens. And if this factor bothers you when operating the machine, then this is one of the signals that something needs to be done.
The Check Engine light is not on - the reason is a dead battery.
The most common thing that could happen is a dead battery. The car stood motionless on the street or in the garage for a long time, and the battery was discharged. It is not difficult to check this development of events; it is enough to test whether the other lights on the instrument panel turn on, whether the headlights are on, etc. The battery for a modern car is a full-fledged power supply, and therefore no electronics of the car can function without it.
What can happen to the battery? Is it only possible to discharge due to downtime? It turns out not. In addition, due to temperature changes, the contacts of the battery terminals may oxidize and not transmit voltage. In addition, one of the terminals or both may simply move away and not sit very tightly, not providing proper contact. Another option is wiring coming from the battery. It is also recommended to check it, since the wires may break in any place.
Check Engine does not light up when you turn the key - the ECU system is faulty
The second reason is the ECU itself. It is recommended to check the unit together with relays, connectors and wires.
Other secondary reasons
In addition, other secondary reasons are possible:
A failure in the system, because modern technologies, unfortunately, are not yet ideal and produce many errors;
- Faulty fuses and relays responsible for the check engine light and the car’s ignition system;
- Problems with the ignition switch, through which the system is turned on;
- Burnout of the light bulb itself inside the instrument panel.
If you are unable to find on your own the reason why the check goes out when you turn on the ignition, you need to immediately go to a service center. Remember that there may be a serious malfunction in the car, and your “iron friend” requires urgent help
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Comments 25
The same situation happened today, I thought that was it, the ECU was screwed up, the check light didn’t light up and the car wouldn’t start, it turned out to be the EFI fuse
Where is that EFI fuse?
Hello from 2022, I discovered a problem on a 2006 VAZ 2113. I opened the computer, found acidified contacts on the board, cleaned it with alcohol and a cotton swab. Now the check works as it should.
I had exactly the same experience. I searched for two days. I dismantled the floor of the car. I measured the resistance between the ECU housing and the negative terminal of the battery = 1.5 kOhm. I connected the wire from the negative terminal of the battery to the ECU housing and the check light came on and the pump started working and started with half a turn. I don’t know if this is possible or necessary)) but for now I’m happy.
Your immobilizer just goes off. We need to turn it off. Or press the button on the door opener remote control several times and try to start it
Good day! Guys are just as bad. Car Camry 40 2008, automatic transmission. I turn on the ignition - the ABS and VSC system come on, but the check engine light is off. The starter is oily, but there are 0 signs of life. While researching this problem, there were a million different versions from many specialists. In just two days my brain has been boiling... I came across a very interesting fact - after disassembling the ECU, there was water inside. the entire board was covered in dew. Now I’m thinking... How will it end for me and how did the water get there? Before this day, I actually drove 500 kilometers through heavy rain. But this is not a ZHIGULI after all... But anyway, when connecting via OBD, the note does not see the ECU at all. not to mention counting mistakes. Maybe someone knows where to start? how to check the connection between the ECU and the car (power supply at the output and input) Thank you all in advance.
Good day . In short, I have the same favla and I don’t have enough anger. The faw Chinese car started up without any problems: I drove in the evening in the morning and it didn’t start (the characteristic sound of pumping the fuel pump disappeared, the checkbox didn’t light up), I took it to the service center after lunch, I thought I’d let it start from a tow, both of them didn’t start, Alelujah, I’m shocked, let’s work for about 3 minutes at idle, it stalled, I started it right away by turning the key without any difficulty! I got to the service station under my own power, it turned out that the only thing that had not been repaired was the electrician who climbed into the computer and poked it and said that he had corrected the error, well, I’m glad, I left the territory, the error check came on again, mourning! I rode for four days, sometimes it stalled twice, twice, three times, and the high point came, it wouldn’t start. I tried to get it in tow again for service without success! I got to the service center, one craftsman said it was the fuel pump in the ice (this happened)! Well, as a rule, they gave up and began to disassemble the tank, removed everything in order, the pump works directly, the current pressure gives 6 points (I’m in shock). We started looking for the problem (electrician). No, the bastards are the official service of the car dealership. They say relay in unison. I flew out and bought it to no avail, everything was protected and looked normal. Well, what should I do? I found the left electrician, he walked for about 15 minutes and came across a computer that said that it wasn’t plowing, well, without thinking for a long time, I found the same machine, took it off and installed it for myself, the result was 0, my work machine started up fantastic! The result is that the electrician on the left side of the car is disassembled, the holidays are ahead, these restrictions don’t work, what should I do, what’s the problem? I also tinkered with what this master was doing in it.
