Conditions for Setting the DTC: P1121
WARNING: This page is about a different car, the 2008 Suzuki Swift +, 2008 Pontiac Wave, and 2008 Chevrolet Aveo. However, it is still accessible from the selected car via links, so may be relevant.
The ECM detects that the TP sensor voltage is greater than 4.9 volts intermittently for greater than 2 seconds during a 60 second time period.