DTC P1121: Throttle Position (TP) Sensor Inconsistent with the Mass Air Flow (MAF) Sensor
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.
P1121 - THROTTLE POSITION (TP) SENSOR INCONSISTENT WITH MASS AIR FLOW (MAF) SENSOR
| Description: | The powertrain control module (PCM) monitors a vehicle operation rationality check by comparing sensed throttle position to mass airflow readings. If, during a key on engine running (KOER) self-test, the comparison of the TP sensor and MAF sensor readings are not consistent with the calibrated load values, the test fails and a DTC is stored in continuous memory. | ||
| Possible Causes: |
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| Diagnostic Aids: | Drive the vehicle and exercise the throttle and the TP sensor in all gears. A TP PID (TP V PID) less than 4.82% (0.24 volt) with a LOAD PID greater than 55%, or a TP PID (TP V PID) greater than 49.05% (2.44 volts) with a LOAD PID less than 30%, indicates a hard fault. | ||
| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| All | - | GO to DH: Throttle Position (TP) Sensor STEP DH16. | GO to DH: Throttle Position (TP) Sensor STEP DH16. |