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

ENGINE 272.967 in MODEL 164, 251

ENGINE 273.923 in MODEL 164

ENGINE 273.943 in MODEL 164

ENGINE 273.963 in MODEL 164, 251

View of accelerator pedal module

Fig 1: Identifying Accelerator Pedal Sensor And Kickdown Simulator - Engines 272.920/940/941

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

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: Exploded View Of Accelerator Pedal Sensor Components

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Replace accelerator pedal module always complete!

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

Fig 3: Internal Circuit Of Accelerator Pedal Sensor (Hall Principle)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

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.