Circuit Description
WARNING: This page is about a different car, the 2003 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.
Accelerator pedal position sensor is located on throttle body and uses 2 sensors which monitor accelerator position. Accelerator pedal position sensor delivers input signals to VPA1 and VPA2 terminals at ECM in proportion to throttle opening. ECM uses input signals for controlling the throttle control motor. DTC is set when ECM determines voltage is out of range on VPA1 or VPA2 circuits between accelerator pedal position sensor and ECM. ECM determines the current opening angle of the accelerator pedal from these signals input from terminals VPA1 and VPA2 and, the ECM controls the throttle motor based on these signals. Possible malfunction causes are:
- Accelerator pedal position sensor circuit is open or shorted.
- Defective accelerator pedal position sensor.
- Defective ECM.