Circuit Description

Accelerator pedal position sensor is mounted on the throttle body and consists of 2 sensors used to detect the accelerator position and malfunctions of the accelerator pedal position sensor. The voltage applied to the terminals VPA and VPA2 of the ECM change between 0 volt and 5 volts in proportion to the opening angle of the accelerator pedal. VPA signal indicates the actual accelerator pedal opening angle which is used for the engine control. VPA2 signal indicates the information about the opening angle which is used for detecting a malfunction. The ECM determines the current opening angle of the accelerator pedal from these signals input from terminals VPA and VPA2. ECM controls the throttle motor based on these signals. If this DTC is stored, the ECM shuts down the power for the throttle motor and the magnetic clutch. The throttle valve is fully closed by the return spring. The opening angle of the throttle valve can be controlled by the accelerator pedal by the throttle cable.