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.
Accelerator Pedal Position Sensor
The Accelerator Pedal Position (APP) sensor is installed on the upper end of the accelerator pedal assembly. The sensors detect the Accelerator Pedal Position and transmits a signal to the ECM. The ECM uses the signal to determine the amount of fuel to be injected.
When one of the Accelerator Pedal Position Sensors has a malfunction, ECM uses a signal from another Accelerator Pedal Position Sensor.
In this case, ECM controls as follows.
- Limits throttle valve angle to approximately 60% or less
- Delays the throttle valve opening speed
- Fixes engine speed at an idling standard value when the brake pedal is depressed
- Fixes idle speed
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.
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