Why doesn't the tachometer return to zero?
1 Answers
The reasons why the tachometer does not return to zero: 1. The speedometer in the vehicle instrument cluster malfunctions, causing the tachometer needle to stop moving; 2. The vehicle's mileage sensor fails. Check if the flexible shaft connection is disconnected, then observe whether the mileage starts to increase. If only the tachometer is not working, it needs to be replaced; 3. There is foreign matter stuck inside the instrument preventing movement. Open the instrument to remove the foreign matter. The tachometer is usually located in the instrument panel, placed symmetrically with the speedometer and odometer. The tachometer operates based on magnetic principles, receiving pulse signals generated when the primary current in the ignition coil is interrupted, and converting this signal into a displayable speed value. The faster the engine speed, the more pulses the ignition coil generates, and the higher the speed value displayed on the gauge.