P0121: Throttle Position (TP) Circuit Performance Problem (All Others)
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 - THROTTLE POSITION (TP) CIRCUIT PERFORMANCE PROBLEM (ALL OTHERS)
| Description: | The TP sensor circuit is monitored by the PCM for a non-closed throttle position at idle. If the 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 self-test at idle. Access KOER diagnostic trouble codes on the diagnostic tool. | ||
| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| All Others: | GO to PINPOINT TEST DH: THROTTLE POSITION (TP) SENSOR Step 23. | GO to PINPOINT TEST DH: THROTTLE POSITION (TP) SENSOR Step 23. | GO to PINPOINT TEST DH: THROTTLE POSITION (TP) SENSOR Step 23. |