What is the reason for not hearing the self-test sound when turning the key?
1 Answers
Self-test itself does not produce any sound, at most you may hear about 1 second of fuel pump pressurization noise. Therefore, the sound you previously heard might be due to unfastened seat belts or improperly closed doors. Here is relevant information about vehicle self-test: Silent self-test: The self-test is the ECU's detection of various sensor signals in cold state to determine if they are normal, which does not generate any sound. Self-test process: Many indicator lights on the dashboard will illuminate, automatically turning off after a few seconds, while malfunctioning indicators will remain lit to alert the driver. Check items: Common indicator lights typically include door alerts, handbrake alerts, seat belt alerts, engine self-test, lubrication oil condition check, ABS system check, etc.