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.
Pedal request
The pedal position sensors consist of two potentiometers supplied 5 V from control module pins 29 (A) and 44(A). The sensors are grounded from control module pins 34(A) and 50(A).
The voltage from sensor 1 is connected to control module pin 12(A) and increases when the pedal is depressed, approx. 0.5-4.5 V.
The voltage from sensor 2 is connected to control module pin 13(A) and increases when the pedal is depressed, approx. 0.3-2 V.
The control module uses the value from sensor 1 as an indicator of the driver's torque request. The value is converted into requested air mass/consumption and constitutes the most important input signal for air mass control.
The value from potentiometer 2 is used to check potentiometer 1. If the values are not in agreement then a fault code will be generated and the pedal sensor will go into limp-home mode.
When the pedal is fully released, the control module adapts the voltage from sensor 1. When the accelerator is fully released, the requested air mass/consumption = 0 and if the car speed = 0 also, the idle speed control will be activated.
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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.