What Causes the Voltage Mismatch Between Throttle Pedal Signal 1 and 2?
2 Answers
The reason for the voltage mismatch between throttle pedal signal 1 and 2 may be a fault in the electronic throttle sensor. The electronic throttle pedal contains two ICs, serving as the primary/secondary pedal sensors. The reference voltage values provided by the factory data can be used as benchmarks: when the pedal is not pressed, the reference voltage for the primary IC should be around 800mV, and approximately 4900mV when fully depressed. If the throttle pedal data deviates from these reference voltages—being either too high or too low—it indicates a potential fault in the electronic throttle pedal. How Electronic Throttle Works: The electronic throttle uses position sensors 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. Symptoms of Electronic Throttle Pedal Failure: If the electronic throttle pedal is damaged, the dashboard warning light will illuminate. The car's throttle pedal may become stiff, produce unusual noises when pressed, or fail to return to its original position after being depressed. Additionally, a faulty electronic throttle pedal can cause the throttle pedal sensor to malfunction, preventing the ECU from detecting the throttle position. This can lead to unstable idling, throttle sticking, unresponsiveness to acceleration, and ultimately render the vehicle inoperable.
As an expert who frequently deals with these issues, I believe that inconsistent voltages between throttle pedal signal 1 and 2 are most commonly caused by a faulty sensor, such as aging or water damage, leading to inaccurate readings. It could also be due to poor wiring connections, like loose or corroded plugs, which are prone to happen on bumpy roads. Additionally, when the ECU or computer module malfunctions, it may misinterpret signal differences. I've seen this situation many times—the direct consequences are the car's warning light turning on, uneven acceleration, and in severe cases, engine speed limiting protection, making driving nerve-wracking. During inspection, use a multimeter to measure the voltage at both ends; if the difference is too large, replace the sensor or clean the wiring. I advise everyone to fix it early and not delay—safety first.
