Pedal Position Sensor

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Fig 1: Identifying Brake Pedal Position Sensor

Courtesy of VOLVO CARS OF NORTH AMERICA.

The pedal position sensor is mounted on the servo unit in the engine compartment. The sensor has several functions. It is used to:

register rapid pedal movements for emergency brake assistance
shut off the traction control during braking
to diagnose the function of the brake lamp switch
it is used by the engine control module (ECM) for cruise control. The signal is transmitted via the control area network (CAN).

The sensor, which responds to the push rod for the pedal, is a sliding potentiometer. 0 mm corresponds to 0 V and 38.5 mm movement corresponds to approximately 95 % of battery voltage (U_bat ).