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Home >> Toyota >> 2006 >> Tacoma X-Runner >> Repair and Diagnosis >> Engine Performance >> Engine Control System (1GR-FE) >> SFI System >> DTC P2121 Throttle/Pedal Position Sensor/Switch "D" Circuit Range/Performance >> Inspection Procedure

Inspection Procedure

  1. READ VALUE OF INTELLIGENT TESTER (ACCEL POS #1 AND ACCEL POS #2) 
    1. Connect an intelligent tester to the DLC3.
    2. Turn the ignition switch ON and turn the tester ON.
    3. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / ACCEL POS #1 and ACCEL POS #2.
    4. Read the values displayed on the tester.

      Standard Voltage 

      STANDARD VOLTAGE REFERENCE

      Accelerator Pedal Operations ACCEL POS #1 (AP#1) ACCEL POS #2 (AP#2)
      Released 0.5 to 1.1 V 1.2 to 2.0 V
      Depressed 2.6 to 4.5 V 3.4 to 5.0 V

    OK: Go to step   3 

    Fig 1: Position Of Depressed & Released Accelerator Pedal
    G04407259Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: Go to next step 

  2. CHECK HARNESS AND CONNECTOR (ACCELERATOR PEDAL POSITION SENSOR - ECM) 
    1. Disconnect the A19 Accelerator Pedal Position (APP) sensor connector.
    2. Disconnect the E8 ECM connector.
    3. Check the resistance.

      Standard Resistance (Check for open) 

      STANDARD RESISTANCE REFERENCE (CHECK FOR OPEN)

      Tester Connections Specified Conditions
      VPA (A19-6) - VPA (E8-18) Below 1 Ω
      EPA (A19-5) - EPA (E8-20)
      VCPA (A19-4) - VCPA (E8-26)
      VPA2 (A19-3) - VPA2 (E8-19)
      EPA2 (A19-2) - EPA2 (E8-21)
      VCP2 (A19-1) - VCP2 (E8-27)

      Standard Resistance (Check for short) 

      STANDARD RESISTANCE REFERENCE (CHECK FOR SHORT)

      Tester Connections Specified Conditions
      VPA (A19-6) or VPA (E8-18) - Body ground 10 kΩ or higher
      EPA (A19-5) or EPA (E8-20) - Body ground
      VCPA (A19-4) or VCPA (E8-26) - Body ground
      VPA2 (A19-3) or VPA2 (E8-19) - Body ground
      EPA2 (A19-2) or EPA2 (E8-21) - Body ground
      VCP2 (A19-1) or VCP2 (E8-27) - Body ground
      Fig 2: Identifying E8 ECM Connector
      G04407260Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Reconnect the APP sensor connector.
    5. Reconnect the ECM connector.

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  3. REPLACE ACCELERATOR PEDAL ROD ASSEMBLY 
  4. CHECK WHETHER DTC OUTPUT RECURS (ACCELERATOR PEDAL POSITION SENSOR DTCS) 
    1. Connect an intelligent tester to the DLC3.
    2. Turn the ignition switch ON and turn the tester ON.
    3. Clear DTCs (See DTC CHECK/CLEAR  ).
    4. Start the engine.
    5. Allow the engine to idle for 15 seconds.
    6. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.
    7. Read DTCs.

      Result 

      RESULT REFERENCE

      Display (DTC Output) Proceed To
      P2121 A
      No output B

    B: SYSTEM OK 

    A: REPLACE ECM 

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