ECD SYSTEM (w/ DPF), Diagnostic DTC:P2121

DTC Code DTC Name
P2121 Throttle / Pedal Position Sensor / Switch "D" Circuit Range / Performance

DESCRIPTION

Refer to DTC P2120 Click here.

P2121
DTC Detection Drive Pattern DTC Detection Condition Trouble Area

Engine switch on (IG)


  • Accelerator pedal fully released for 3 seconds

  • Accelerator pedal depressed partway for 3 seconds

  • Accelerator pedal fully depressed for 3 seconds

 The difference between VPA and VPA2 is less than 0.4 V, or more than 1.2 V for 0.5 seconds (1 trip detection logic).

  • Accelerator pedal position sensor circuit

  • Accelerator pedal position sensor

  • ECM
Related Data List
DTC No. Data List
P2121

  • Accel Position

  • Accel Sens. No.1 Volt %

  • Accel Sens. No.2 Volt %

WIRING DIAGRAM

Refer to DTC P2120 Click here.

INSPECTION PROCEDURE

Note


  • After replacing the ECM, the new ECM needs registration Click here and initialization Click here.

  • After replacing the fuel supply pump assembly, the ECM needs initialization Click here.

  • After replacing an injector assembly, the ECM needs registration Click here.

Tech Tips

Read freeze frame data using the GTS. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, and other data from the time the malfunction occurred.

PROCEDURE


  1. READ VALUE USING GTS (ACCELERATOR PEDAL POSITION SENSOR)


    1. A015CLQE03
      Text in Illustration
      *1 Accelerator Pedal Assembly
      *a Depressed
      *b Released

      Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG) and turn the GTS on.

    3. Enter the following menus: Engine and ECT / Data List / Accel Sens. No.1 Volt % and Accel Sens. No.2 Volt %.

    4. Read the values.

      Standard
      Accelerator Pedal Accel Sens. No.1 Volt % Accel Sens. No.2 Volt %
      Released 10 to 22% 24 to 40%
      Depressed 52 to 90% 68 to 99%
      Result
      Result Proceed to
      NG A
      OK B

    B

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

    A

  2. CHECK HARNESS AND CONNECTOR (ACCELERATOR PEDAL POSITION SENSOR - ECM)


    1. Disconnect the accelerator pedal position sensor connector.

    2. Disconnect the ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      A31-1 (VCP2) - A38-56 (VCP2) Always Below 1 Ω
      A31-2 (EPA2) - A38-58 (EPA2) Always Below 1 Ω
      A31-3 (VPA2) - A38-54 (VPA2) Always Below 1 Ω
      A31-4 (VCPA) - A38-55 (VCPA) Always Below 1 Ω
      A31-5 (EPA) - A38-57 (EPA) Always Below 1 Ω
      A31-6 (VPA) - A38-53 (VPA) Always Below 1 Ω
      A31-1 (VCP2) or A38-56 (VCP2) - Body ground Always 10 kΩ or higher
      A31-2 (EPA2) or A38-58 (EPA2) - Body ground Always 10 kΩ or higher
      A31-3 (VPA2) or A38-54 (VPA2) - Body ground Always 10 kΩ or higher
      A31-4 (VCPA) or A38-55 (VCPA) - Body ground Always 10 kΩ or higher
      A31-5 (EPA) or A38-57 (EPA) - Body ground Always 10 kΩ or higher
      A31-6 (VPA) or A38-53 (VPA) - Body ground Always 10 kΩ or higher
      Standard Resistance
      for RHD
      Tester Connection Condition Specified Condition
      A31-1 (VCP2) - A52-56 (VCP2) Always Below 1 Ω
      A31-2 (EPA2) - A52-58 (EPA2) Always Below 1 Ω
      A31-3 (VPA2) - A52-54 (VPA2) Always Below 1 Ω
      A31-4 (VCPA) - A52-55 (VCPA) Always Below 1 Ω
      A31-5 (EPA) - A52-57 (EPA) Always Below 1 Ω
      A31-6 (VPA) - A52-53 (VPA) Always Below 1 Ω
      A31-1 (VCP2) or A52-56 (VCP2) - Body ground Always 10 kΩ or higher
      A31-2 (EPA2) or A52-58 (EPA2) - Body ground Always 10 kΩ or higher
      A31-3 (VPA2) or A52-54 (VPA2) - Body ground Always 10 kΩ or higher
      A31-4 (VCPA) or A52-55 (VCPA) - Body ground Always 10 kΩ or higher
      A31-5 (EPA) or A52-57 (EPA) - Body ground Always 10 kΩ or higher
      A31-6 (VPA) or A52-53 (VPA) - Body ground Always 10 kΩ or higher

    4. Reconnect the accelerator pedal position sensor connector.

    5. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  3. REPLACE ACCELERATOR PEDAL ROD ASSEMBLY


    1. Replace the accelerator pedal rod assembly Click here.


    NEXT

  4. CHECK WHETHER DTC OUTPUT RECURS (DTC P2121)


    1. Connect the GTS to the DLC3.

    2. Clear the DTCs Click here.

    3. Turn the engine switch on (IG).

    4. Fully release the accelerator pedal for 3 seconds or more, then depress it partway for 3 seconds or more, and then fully depress it for 3 seconds or more.

    5. Enter the following menus: Engine and ECT / Trouble Codes.

    6. Read the DTCs.

      Result
      Result Proceed to
      P2121 is output A
      No DTC is output B

    B

    END

    A

  5. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  6. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.


    NEXT

  7. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the GTS to the DLC3.

    2. Clear the DTCs Click here.

    3. Turn the engine switch off.

    4. Turn the engine switch on (IG).

    5. Fully release the accelerator pedal for 3 seconds or more, then depress it partway for 3 seconds or more, and then fully depress it for 3 seconds or more.

    6. Enter the following menus: Engine and ECT / Trouble Codes.

    7. Confirm that the DTC is not output again.


    NEXT

    END