What are the symptoms of a faulty throttle pedal position sensor?
2 Answers
When an electronic throttle pedal malfunctions, symptoms may include abnormal noises when pressing the pedal or the pedal not returning to its original position. Most electronic throttle pedal failures are caused by internal throttle pedal sensor issues. If the throttle pedal sensor fails or is damaged, the malfunction indicator light will illuminate, and the ECU will be unable to detect the throttle position. This can lead to unstable idle speed, throttle sticking, unresponsive acceleration, and other issues, rendering the vehicle inoperable. The role of the electronic throttle pedal: As a key component of the electronic throttle control system, the performance of the electronic throttle pedal not only affects multiple vehicle performance indicators such as power, comfort, and fuel economy but also directly impacts driving safety. How the electronic throttle works: The electronic throttle uses a position sensor to transmit signals indicating the depth and speed of pedal depression. These signals are received and interpreted by the ECU, which then issues control commands. The throttle valve adjusts its opening angle accordingly, either quickly or gradually. Repairing the throttle pedal sensor: If the throttle pedal sensor fails, it should be inspected and repaired promptly. Remove the throttle assembly, locate the signal output wires corresponding to the sensor, and use a multimeter in resistance mode to measure the circuit. Move the pedal and observe changes in the meter readings to determine if there is a fault. Check the sensor wiring harness for breaks or disconnected connectors. If any damage is found, replace the component directly.
I've been driving for decades and have encountered situations where the throttle pedal position sensor failed. When pressing the accelerator, it felt mushy, acceleration was particularly sluggish, the car couldn't pick up speed, and there were occasional speed fluctuations. The engine warning light would also come on, as if alerting me to a problem. Sometimes pressing the pedal had no effect at all, and I could only drive home slowly. This is no small matter—if sudden acceleration failure occurs on the highway, it could lead to an accident. So, as soon as I noticed this issue, I immediately went to the repair shop for a check. The mechanic said that a faulty sensor could cause the computer to control fuel supply incorrectly, and over time, it might even affect the engine's lifespan. They recommended checking the sensor connections for looseness during regular maintenance to avoid moisture ingress.
