DTC P0121: Throttle/Pedal Position Sensor A Circuit Range/Performance
WARNING: This page does not describe the selected car, but rather 30 other vehicles, including the 2006 Mercury Mountaineer, 2006 Mercury Monterey, 2006 Mercury Montego, 2006 Mercury Mariner, and 2006 Mercury Grand Marquis. However, it is still accessible from the selected car via links, so may be relevant.
P0121 - THROTTLE/PEDAL POSITION SENSOR A CIRCUIT RANGE/PERFORMANCE
| For Vehicles With Electronic Throttle Control (ETC) | |||
| Description: | The electronic throttle control (ETC) throttle position (TP) sensor 1 circuit was flagged as a concern by the powertrain control module (PCM) indicating an out of range in either the closed or wide open throttle (WOT) modes. | ||
| Possible Causes: |
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| Diagnostic Aids: | This concern exhibits a symptom of limited power. A TP1 PID (TP V PID) reading less than 13% (0.65 volt), or greater than 93% (4.65 volts) in key ON, engine OFF or key ON, engine running indicates a concern is present. | ||
| For All Others | |||
| Description: | The throttle position (TP) sensor circuit is monitored by the powertrain control module (PCM) for a non-closed throttle position at idle. If the key on engine running (KOER) self-test terminates upon placing the transmission gear selector in DRIVE or REVERSE or when closing the throttle (idle) after opening it (in PARK or NEUTRAL) the TP closed throttle position is not attained, and the test fails. | ||
| Possible Causes: |
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| 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 (KOER) self-test at idle. | ||
| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| Vehicles With Electronic Throttle Control (ETC) | GO to Pinpoint Test DV . | ||
| All others | GO to Pinpoint Test DH . | ||