P0121: Etc Throttle Position (TP1) Sensor Circuit Range/Performance (Vehicles With Electronic Throttle Control (Etc))

WARNING: This page does not describe the selected car, but rather 30 other vehicles, including the 2004 Mercury Sable, 2004 Mercury Mountaineer, 2004 Mercury Monterey, 2004 Mercury Marauder, and 2004 Mercury Grand Marquis. However, it is still accessible from the selected car via links, so may be relevant.

P0121 - ETC THROTTLE POSITION (TP1) SENSOR CIRCUIT RANGE/PERFORMANCE (VEHICLES WITH ELECTRONIC THROTTLE CONTROL (ETC))

Description:	The ETC TP1 sensor was flagged as fault status by the PCM indicating an out of range in either the closed or wide open throttle modes.
Possible Causes:	Obstruction in the throttle plate movement. Damaged throttle body. TP circuit open to PCM. Damaged TP sensor. SIG RTN circuit open to the TP sensor. Operator placing.
Diagnostic Aids:	The fault exhibits a symptom of limited power. A TP1 PID (TP V PID) reading less than 3.42% (0.17 volt) in key ON engine OFF, continuous memory or key ON engine running indicates a hard fault.
Application	Key On Engine Off	Key On Engine Running	Continuous Memory
Vehicles with electronic throttle control (ETC)	GO to PINPOINT TEST DV: THROTTLE BODY ASSEMBLY ETC Step 1.	GO to PINPOINT TEST DV: THROTTLE BODY ASSEMBLY ETC Step 1.	GO to PINPOINT TEST DV: THROTTLE BODY ASSEMBLY ETC Step 1.