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Home >> Lexus >> 2009 >> IS F >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control (SFI) System (Diagnostic Codes & Circuit Tests) >> SFI System >> DTC P2121: Throttle / Pedal Position Sensor / Switch "D" Circuit Range / Performance >> Procedure

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

  1. READ VALUE USING TECHSTREAM (ACCELERATOR POSITION SENSOR) See step   1 

    NG → See step   3 

    OK: Go to next step 

  2. INSPECT WHETHER DTC OUTPUT RECURS (ACCELERATOR PEDAL POSITION SENSOR DTC) 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG) and turn the Techstream ON.
    3. Clear DTC. Refer to DTC CHECK / CLEAR .
    4. Start the engine.
    5. Allow the engine to idle for 15 seconds.
    6. Enter the following menus: Powertrain / Engine / Trouble Codes.
    7. Read the DTCs.

      Result

      Result Proceed to
      DTC P2121 is output A
      DTC is not output B

    B → See step   5 

    A → See step   6 

  3. REPLACE ACCELERATOR PEDAL ROD ASSEMBLY 
    1. Replace the accelerator pedal rod assembly. Refer to REMOVAL .

    NEXT: Go to next step 

  4. CHECK WHETHER DTC OUTPUT RECURS (ACCELERATOR PEDAL POSITION SENSOR DTC) 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG) and turn the Techstream ON.
    3. Clear DTC. Refer to DTC CHECK / CLEAR .
    4. Start the engine.
    5. Allow the engine to idle for 15 seconds.
    6. Enter the following menus: Powertrain / Engine / Trouble Codes.
    7. Read the DTC.

      Result

      Result Proceed to
      DTC P2121 is output A
      DTC is not output B

    B → END 

    A → See step   6 

  5. CHECK FOR INTERMITTENT PROBLEMS. Refer to  CHECK FOR INTERMITTENT PROBLEMS 
  6. REPLACE ECM. Refer to  REMOVAL 
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