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Home >> Mercury >> 2009 >> Mariner Base, 2.5 7, AWD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Powertrain DTC Charts & Descriptions (Except Diesel & Hybrid) >> DTC Diagnosis >> DTC P2121: - Throttle/Pedal Position Sensor/Switch D Circuit Range/Performance

DTC P2121: - Throttle/Pedal Position Sensor/Switch D Circuit Range/Performance

DTC P2121: - THROTTLE/PEDAL POSITION SENSOR/SWITCH D CIRCUIT RANGE/PERFORMANCE

Description:  The accelerator pedal position (APP) sensor fault flag is set for sensor 1 by the powertrain control module (PCM), indicating the signal is out of the normal self-test operating range.
Possible Causes: 
  • APP sensor 1 is open, or short to ground or voltage
  • APP sensor signal circuits are short together
  • Damaged APP sensor
  • Damaged PCM
Diagnostic Aids:  An APP1 sensor PID reading may indicate a concern.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All GO to Pinpoint Test DK .