Monitoring Function

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Fig 1: Accelerator Pedal Position Sensor Voltage Graph

Courtesy of BMW OF NORTH AMERICA, INC.

First the voltage range of both sensors is checked. If they are under or over a certain voltage, the corresponded fault code is set.

Once the Min / Max voltage range has been checked (meaning they are no errors), they are checked for rationality. This means both sensors must measure approximately the same pedal position value. If this is not the case, a P-Code is stored and the "check engine soon" indicator bit is set.

Each recognized error leads to a power reduction.

Each detected error leads to a power reduction. Full power is no longer possible until the driver restarts the motor.