Why does the Nissan Tiida's tachometer fluctuate significantly?

[DelLeilani]

The reason for significant fluctuations in the Nissan Tiida's tachometer is either severe carbon buildup in the throttle body or a malfunctioning water temperature sensor. The working principle of the car's tachometer is that it receives digital pulse signals, processes them, and directly inputs them into the CPU's counting port. The software then calculates the RPM and the corresponding position of the needle, which is then amplified through the CPU's control port to drive the stepper motor to rotate in both positive and negative directions, indicating the corresponding RPM value. Each step of the stepper motor is only one-third of a degree. The Nissan Tiida is a car produced by Dongfeng Nissan Passenger Vehicle Company. Although it is 190 millimeters shorter than the Nissan Latio, this seems to add more agility to the car without compromising the interior space. Additionally, the engine features technologies such as variable valve timing and double overhead camshafts, along with an all-aluminum inline four-cylinder layout, all of which give this car exceptional dynamic performance.