DTC P1121: Throttle Position Sensor Signal Lower Than Expected
WARNING: This page is about a different car, the 2003 Acura 3.2TL and 2003 Acura 3.2CL. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
TP sensor is part of throttle body and not serviced separately.
Turn ignition switch on. Using scan tool, check TP sensor. If throttle position is 13.7 percent when throttle is fully opened, problem is intermittent. System is okay at this time. If throttle position reading is not as specified, replace throttle body.