What is the function of the throttle position sensor?
2 Answers
The throttle position sensor is also known as the throttle opening sensor or throttle switch. Its function is to detect the engine's operating conditions, primarily determining whether the engine is in idle mode or under load, as well as whether it is accelerating or decelerating. Below is more detailed information about the throttle position sensor: 1. Structure: The resistor's rotating shaft is connected to the throttle. It has two contacts: a full-open contact and an idle contact. When the throttle is in the idle position, the idle contact closes, sending an idle condition signal to the computer. When the throttle is in other positions, the idle contact opens, outputting a voltage signal corresponding to the throttle's angle. The computer then identifies the engine's load based on the signal voltage value and determines whether the engine is accelerating or decelerating based on the rate of change in the signal voltage over a certain period. 2. Impact of failure: A faulty throttle sensor can lead to abnormal idle operation (such as excessively high or low idle speed, unstable idle, or easy stalling) or abnormal acceleration (such as engine shaking during acceleration or delayed acceleration response). It may also cause intermittent engine vibration during operation.
Back when I worked as a mechanic, I often dealt with throttle position sensor (TPS) issues. Its main function is to tell the car's computer how much the throttle is open. Simply put, when you press the accelerator, it measures the angle at which the throttle opens and sends that signal to the computer, which then adjusts fuel injection and ignition timing accordingly. This helps the engine run more smoothly and efficiently. If it stops working, you might notice sluggish acceleration, rough idling, or a sudden spike in fuel consumption. I've encountered several cases where the check engine light came on, and diagnostics revealed erratic TPS signals. I recommend checking this component during regular maintenance to avoid affecting your daily driving experience.
