Why can't I hear the self-test sound when turning the key?
2 Answers
Not hearing the self-test sound when turning the key is caused by damaged spark plugs, faulty ignition coils, or severe carbon buildup. Function of spark plugs: Commonly known as sparking plugs, their function is to discharge the pulsed high voltage electricity sent from the high-tension leads (spark plug wires), breaking down the air between the two electrodes of the spark plug to generate an electric spark, thereby igniting the air-fuel mixture in the cylinder. Main types of spark plugs: Main types include standard spark plugs, extended insulator spark plugs, electrode-type spark plugs, seat-type spark plugs, pole-type spark plugs, and surface-gap spark plugs. Spark plugs work in conjunction with the ignition system and fuel supply system to enable engine operation, collectively determining engine performance to a great extent.
I often encounter this issue – turning the key but not hearing the self-check sound is really annoying. It’s mostly due to insufficient car battery power or a blown fuse. When the battery ages and can’t hold a full charge, the onboard computer’s self-check system lacks the power to start up, so no sound is produced. The troubleshooting method is simple: first, try honking the horn or turning on the headlights. If the lights are dim or the horn doesn’t work, it’s likely a battery issue requiring a recharge or replacement. Otherwise, check the audio fuse in the fuse box, which might be near the engine compartment (the manual should indicate its location). Additionally, a depleted key fob battery could also affect signal transmission. While this isn’t a major problem, don’t delay fixing it—if the system malfunctions and affects driving safety, things could get serious. I recommend immediately visiting a repair shop to test the voltage or replace the necessary parts. This experience has made me more attentive to regular battery maintenance, ensuring a safer and more worry-free drive.
