On electronic injection systems, there is no longer a load lever that mechanically controls the fuelling. The flow is calculated by the ECM depending on a number of parameters, including pedal position, which is measured using a potentiometer. The pedal sensor has two potentiometers with mechanically solid slides. The two potentiometers are supplied from distinct and different power sources so there is built in redundancy of information giving reliable information on driver's request. A voltage is generated across the potentiometer in the acceleration position sensor as a function of the accelerator-pedal setting. Using a programmed characteristic curve, the pedal's position is then calculated from this voltage.