Component description for accelerator pedal sensor - GF30.20-P-2011CY

ENGINE 156, 271, 272, 642, 646, 651 in MODEL 204

Shown is the driver footwell

Fig 1: Overview Of Accelerator Pedal Sensor

Courtesy of MERCEDES-BENZ USA

Location

The accelerator pedal sensor is located behind the accelerator pedal module.

Task

The accelerator pedal sensor converts the mechanical movement of the accelerator pedal into an electrical voltage that corresponds to the accelerator pedal position.

Design

Shown is the internal circuit

Fig 2: Accelerator Pedal Sensor - Circuit Diagram

Courtesy of MERCEDES-BENZ USA

Function

The accelerator pedal sensor consists of a shaft with 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. Information about the accelerator pedal position is sent in the form of two signal voltages to the ME-SFI [ME] control unit (N3/10) (for gasoline engines) or the CDI control unit (N3/9) (for diesel engines).

Emergency running

If the signal voltage of one Hall element fails, the signal voltage of the other Hall element is used and the engine goes into limp-home mode.