P0122 - Throttle/Pedal Position Sensor A Circuit Low

WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2008 Mercury Sable, 2008 Mercury Mountaineer, 2008 Mercury Milan, 2008 Mercury Mariner, and 2008 Mercury Grand Marquis. However, it is still accessible from the selected car via links, so may be relevant.

P0122 - THROTTLE/PEDAL POSITION SENSOR A CIRCUIT LOW

For Vehicles With Electronic Throttle Control (ETC)
Description:	The ETC throttle position (TP) sensor 1 circuit was flagged as a concern by the powertrain control module (PCM) indicating a low voltage or open circuit.
Possible Causes:	Open ETC TP sensor harness Short to ground in the ETC TP sensor harness Damaged TP sensor SIG RTN circuit open to the TP sensor
Diagnostic Aids:	This concern exhibits a symptom of limited power. A TP1 PID reading less than 0.25 volt in key ON, engine OFF or key ON, engine running indicates a concern is present.
For All Others
Description:	The TP sensor circuit is monitored by the PCM for a high TP rotation angle (or voltage) input through the comprehensive component monitor (CCM). The test fails if the TP rotation angle (or voltage) changes above the maximum calibrated limit.
Possible Causes:	TP sensor not seated properly TP circuit open to PCM VREF open to TP sensor TP circuit short to GND Damaged TP sensor
Diagnostic Aids:	This concern exhibits a symptom of limited power. A TP PID reading less than 3.42% (0.17 volt) in key ON, engine OFF or key ON, engine running indicates a concern is present.
Application		Key On Engine Off	Key On Engine Running	Continuous Memory
Vehicles With Electronic Throttle Control (ETC)		refer to PINPOINT TEST DV .
All others		refer to PINPOINT TEST DH .