Accelerator pedal sensor, component description

P30.20-2151-11

View of driver footwell

B37 Accelerator pedal sensor

Location

The accelerator pedal sensor is located in the top of the accelerator pedal module.

Task

The accelerator pedal sensor converts mechanical operation of the accelerator pedal into an electrical voltage according to the accelerator pedal position.

P30.20-2142-11

Design

Shown is the internal circuit

1 Pin 1: Voltage supply (5 V)

2 Pin 2: Signal voltage 1 (approx. 0.40 - 4.50 V)

3 Pin 3: Ground Hall element 1

4 Pin 4: Ground Hall element 2

5 Pin 5: not used

6 Pin 6: Signal voltage 2 (approx. 0.20 - 2.25 V)

A Hall element 1

B Hall element 2

LHD Idle position

FL Full-load position

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 accelerator pedal position information is sent in the form of two signal voltages to the ME-SFI control unit (N3/10) (on gasoline engines) or the CDI control unit (N3/9) (on 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.