Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Circuit Description
The accelerator pedal position sensor is mounted on the accelerator pedal bracket and it has 2 sensors to detect the accelerator position and a malfunction of the accelerator position sensor. Voltage applied to pedal terminals VPA and VPA2 of ECM changes between 0-5 volts in proportion to opening angle of the accelerator pedal. VPA is a signal to indicate the actual accelerator pedal opening angle which is used for the engine control, and VPA2 is a signal to indicate the information about the opening angle which is used for detecting a malfunction. ECM judges the current opening angle of the accelerator pedal from these signals input from terminals VPA and VPA2. ECM controls throttle motor based on these signals. If DTCs are stored, throttle valve is locked at a certain opening angle. Electronically controlled throttle operation is cancelled until the system returns to normal and the ignition switch is turned OFF. Possible causes are:
- Open or short in accelerator pedal position sensor circuit.
- Faulty accelerator pedal position sensor.
- Faulty ECM.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.