DTC P1531: Pedal Position Sensor 1 and 2 Circuit. Adapted Sum Out of Range.: Notes
WARNING: This page is about a different car, the 2003 Saab 9-3 and 2002 Saab 9-3. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Pedal Position Sensor 1 And 2 Circuit Diagram - Adapted Sum Out Of Range