Accelerator Pedal Position Sensor: Description and Operation

GF30.20-P-2010AMG Component Description For The Accelerator Pedal Sensor

The accelerator pedal sensor is located at top right of accelerator pedal module.

The accelerator pedal sensor is located at top right of accelerator pedal module.

Task
The accelerator pedal sensor converts the mechanical operation input by accelerator pedal into an electrical voltage corresponding to the accelerator pedal position.

The kickdown simulator is not an electrical component. It is designed to enable the driver to sense with his foot the point at which the accelerator pedal is fully depressed (full load position).

The accelerator pedal sensor can only be replaced completely by an accelerator pedal module.

Function
The accelerator pedal sensor consists of a shaft with a ring magnet. The ring magnet rotates in a printed circuit board with stator in the two fixed Hall elements. This produces a change in the voltage. The supply voltage of 5 V is performed by the ME-SFI [ME] control unit.N3/10 The supply voltage in the accelerator pedal sensor is halved for sensor 2.

Information from the accelerator pedal position is fed in the form of two signal voltages to the ME-SFI [ME] control unit.

If there is a fault on Signal 1 (sensor 1) the system switches over to Signal 2 (sensor 2) and limp-home is activated.

Signal 1 ranges are defined as percentages of the supply voltage (approx. 5 V) as follows:
- <4.0% is the signal caused by short circuit to ground - too small
- 4.0 to 9.4% - idle range
- 9.4 to 81.0% - partial load range
- 81.0 to 96.0% - full load range
- >96.0% the signal is too high due to a short-circuit to positive.

Kickdown recognition takes place by the ME-SFI [ME] control unit if the accelerator pedal sensor prescribes full load for a certain time.