DTC P0121: Throttle Position (TP1) Sensor Circuit Range/Performance
WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2005 Mercury Sable, 2005 Mercury Mountaineer, 2005 Mercury Monterey, 2005 Mercury Montego, and 2005 Mercury Mariner. However, it is still accessible from the selected car via links, so may be relevant.
P0121 - THROTTLE POSITION (TP1) SENSOR CIRCUIT RANGE/PERFORMANCE
| For Vehicles With Electronic Throttle Control (ETC) | |||
| Description: | The electronic throttle control (ETC) TP1 sensor was flagged as fault status 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 fault 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 (KOEO), continuous memory, or key on engine running (KOER) indicates a hard fault. | ||
| For All Others | |||
| Description: | The 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 range selector in gear (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 DV: Throttle Body Assembly ETC STEP DV1. | ||
| All others | GO to DH: Throttle Position (TP) Sensor STEP DH22. | ||