What is the reason why the engine light does not illuminate during self-check?
2 Answers
Engine self-check failure light not illuminating is a normal phenomenon. Below is the relevant information: 1. Engine self-check light: The engine self-check light, also known as the engine fault light, illuminates when there is an issue with the engine. These faults generate a series of codes, and when the ECU reads these fault codes, it displays them as indicator lights on the dashboard. If the engine self-check light remains illuminated after the vehicle has started, it indicates that there may be a fault with your engine. 2. Precautions: The engine fault light is often caused by the fuel emission system. When the fault light is on, start and turn off the vehicle three times, then observe whether the fault light remains illuminated upon restarting. If it is still illuminated, promptly visit a workshop to check the fault codes.
While driving, I noticed the check engine light didn't illuminate during self-test, which is quite a common issue. From personal experience, it's usually caused by a burnt-out bulb or LED in the instrument cluster that needs replacement. Alternatively, a blown fuse could be the culprit – you can check this by opening the fuse box and inspecting the corresponding position. Wiring issues like short circuits or loose connections may also prevent the light from working, requiring simple testing with a test light tool. More seriously, control module failures such as a malfunctioning instrument cluster itself or the engine ECU failing to send signals can cause the light to remain completely unresponsive during startup. The check engine light is crucial because it should illuminate and then turn off during self-test to indicate system normality; if it doesn't light up, you'd have no way of knowing about potential engine problems, which could lead to breakdowns or more severe damage. My suggestion is to start with simple checks – inspect fuses and bulbs first. If that doesn't resolve it, take the car to a repair shop for professional diagnostic scanning. Don't wait until something serious happens to address it.
