DTC P1512: Throttle Position Sensor Minimum Learn Fault: Description
WARNING: This page is about a different car, the 2002 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
The throttle control actuator module performs a learn procedure each time the ignition is turned to the ON position. Within 200 ms of the key being turned to the ON position and back to the desired idle position. The throttle position percentage at the rest position is approximately 34 percent. DTC P1512 sets if the ECM cannot fully move the throttle plate to the fully closed position within 5 percent.