Accelerator pedal sensor component description - GF30.20-P-2010V

ENGINE 272.920 in MODEL 203 up to Model Year 8

ENGINE 272.922 in MODEL 211

ENGINE 272.940 in MODEL 203 up to Model Year 8

ENGINE 272.941 in MODEL 203 up to Model Year 8

ENGINE 272.942 in MODEL 171 up to Model Year 8

ENGINE 272.943 in MODEL 211, 219

ENGINE 272.944 in MODEL 211

ENGINE 272.945 in MODEL 251 up to Model Year 8

ENGINE 272.946 in MODEL 221 up to Model Year 8

ENGINE 272.960 in MODEL 203 up to Model Year 8

ENGINE 272.963 in MODEL 171 up to Model Year 8

ENGINE 272.964 in MODEL 211, 219

ENGINE 272.965 in MODEL 221 up to Model Year 8

ENGINE 272.966 in MODEL 230 up to Model Year 8

ENGINE 272.967 in MODEL 164, 251 up to Model Year 8

ENGINE 272.970 in MODEL 203 up to Model Year 8

ENGINE 272.972 in MODEL 211

ENGINE 272.975 in MODEL 221 up to Model Year 8

ENGINE 272.985 in MODEL 211, 219

ENGINE 273.922 in MODEL 221 up to Model Year 8

ENGINE 273.923 in MODEL 164 up to Model Year 8

ENGINE 273.924 in MODEL 221 up to Model Year 8

ENGINE 273.960 in MODEL 211, 219

ENGINE 273.961 in MODEL 216, 221 up to Model Year 8

ENGINE 273.962 in MODEL 211

ENGINE 273.963 in MODEL 164, 251 up to Model Year 8

ENGINE 273.965 in MODEL 230 up to Model Year 8

ENGINE 273.967 in MODEL 209

ENGINE 273.968 in MODEL 221 up to Model Year 8

ENGINE 272.940 in MODEL 209

ENGINE 272.960 in MODEL 209

View of accelerator pedal module

Fig 1: Locating Accelerator Pedal Sensor

Courtesy of MERCEDES-BENZ USA

Location

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

Task

Detects the accelerator pedal position and relays the corresponding voltage signals to the motor electronics control unit.

Fig 2: Identifying Accelerator Pedal Components

Courtesy of MERCEDES-BENZ USA

Shown: the internal circuit in the accelerator pedal sensor (Hall principle)

Fig 3: Accelerator Pedal Sensor Circuit Diagram

Courtesy of MERCEDES-BENZ USA

Function

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

The accelerator pedal sensor operating on the Hall principle is integrated in the pedal lever shaft and consists of a shaft with a ring magnet. This rotates in a printed circuit board with stator in the fixed Hall elements. This produces a change in the voltage.

The accelerator pedal sensor is supplied via pin 1 from the ME control unit

with 5 V. Pin 3 and 6 are ground connections.

The information of the accelerator pedal position is transmitted to the motor electronics control unit in the form of two signals (pin 5 with signal 1 has maximum approximately 4.8 V and pin 4 with signal 2 maximum approximately 2.4 V).

The supply voltage in the accelerator pedal sensor is halved for sensor 2.

Signal 1 ranges are defined as percentages of the supply voltage (approx. 5 V) as follows:

up to 4 % the signal is too small via short-circuit to ground or via line interruption
4 to 9.4 % idle range
9.4 to 81 % partial-load range
81 to 96 % full load range
above 96 % the signal is too high via short-circuit to positive.

Kick-down detection takes place via the accelerator pedal sensor, is signals 1 and 2 fall within full load range for a certain period.

If the brake pedal is operated, only the idle speed values from the accelerator pedal sensor are accepted. If necessary, the engine control unit will generate substitute values. The signals from the accelerator pedal sensor are rejected over this time

In the event of an error at signal 1, a switchover to signal 2 takes place and emergency mode is activated.