P0123: Etc Throttle Position (TP1) Sensor Circuit High Input (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.

P0123 - ETC THROTTLE POSITION (TP1) SENSOR CIRCUIT HIGH INPUT (VEHICLES WITH ELECTRONIC THROTTLE CONTROL (ETC))

Description:	The ETC TP1 sensor was flagged as fault status by the PCM indicating high voltage.
Possible Causes:	ETC TP sensor harness shorted to VREF. ETC TP sensor harness shorted to PWR. Damaged TP sensor. VREF circuit shorted to TP sensor.
Diagnostic Aids:	Drive the vehicle, bring it to a stop, and turn the key to the OFF position. Start the vehicle, and run the key ON engine running self-test at idle. Access KOER diagnostic trouble codes on the diagnostic tool. The TP1 signal is normally at a high voltage at closed throttle, and a lower voltage at wide open throttle (opposite of TP2).
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.