ECD SYSTEM, Diagnostic DTC:P2121

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

DESCRIPTION

Refer to DTC P2120.

Click here

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P2121 Throttle / Pedal Position Sensor / Switch "D" Circuit Range / Performance The difference between VPA and VPA2 is below 0.4 V, or higher than 1.2 V for 0.5 seconds (1 trip detection logic).

  • Accelerator pedal sensor assembly circuit

  • Accelerator pedal sensor assembly

  • ECM

 Comes on DTC stored
Related Data List
DTC No. Data List
P2121

  • Accel Position

  • Accel Sens. No.1 Volt %

  • Accel Sens. No.2 Volt %

CONFIRMATION DRIVING PATTERN

DTC No. DTC Detection Drive Pattern
P2121

Ignition switch ON


  • Accelerator pedal fully closed for 3 seconds

  • Accelerator pedal open partway for 3 seconds

  • Accelerator pedal fully open for 3 seconds

WIRING DIAGRAM

Refer to DTC P2120.

Click here

CAUTION / NOTICE / HINT

Note

After replacing the ECM, the new ECM needs registration (Click here) and initialization 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. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON and turn the GTS on.

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


      Powertrain > Engine > Data List
      Tester Display
      Accel Sens. No.1 Volt %
      Accel Sens. No.2 Volt %

    4. Read the values.

      Standard Voltage
      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 95%
      Result
      Proceed to
      OK
      NG

    OK

    GO TO STEP 7 Click here

    NG

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


    1. Disconnect the accelerator pedal sensor assembly connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A6-1 (VCP2) - A61-57 (VCP2) Always Below 1 Ω
      A6-2 (EPA2) - A61-58 (EPA2) Always Below 1 Ω
      A6-3 (VPA2) - A61-54 (VPA2) Always Below 1 Ω
      A6-4 (VCPA) - A61-55 (VCPA) Always Below 1 Ω
      A6-5 (EPA) - A61-56 (EPA) Always Below 1 Ω
      A6-6 (VPA) - A61-53 (VPA) Always Below 1 Ω
      A6-1 (VCP2) or A61-57 (VCP2) - Body ground Always 10 kΩ or higher
      A6-2 (EPA2) or A61-58 (EPA2) - Body ground Always 10 kΩ or higher
      A6-3 (VPA2) or A61-54 (VPA2) - Body ground Always 10 kΩ or higher
      A6-4 (VCPA) or A61-55 (VCPA) - Body ground Always 10 kΩ or higher
      A6-5 (EPA) or A61-56 (EPA) - Body ground Always 10 kΩ or higher
      A6-6 (VPA) or A61-53 (VPA) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  3. REPLACE ACCELERATOR PEDAL SENSOR ASSEMBLY


    1. Replace the accelerator pedal sensor assembly.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  4. CHECK WHETHER DTC OUTPUT RECURS (DTC P2121)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Clear the DTCs.


      Powertrain > Engine > Clear DTCs

    5. Turn the ignition switch off and wait for 30 seconds.

    6. Turn the ignition switch to ON and turn the GTS on.

    7. Fully close the accelerator pedal for 3 seconds or more, then hold it partway open for 3 seconds or more, and then fully open it for 3 seconds or more.

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

    9. Read the DTCs.


      Powertrain > Engine > Trouble Codes
      Result
      Result Proceed to
      DTC P2121 is output A
      DTC is not output B

    B

    END

    A

  5. REPLACE ECM


    1. Replace the ECM.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 7 Click here

  6. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.

      Result
      Proceed to
      NEXT

    NEXT

  7. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Clear the DTCs.


      Powertrain > Engine > Clear DTCs

    5. Turn the ignition switch off and wait for 30 seconds.

    6. Turn the ignition switch to ON and turn the GTS on.

    7. Fully close the accelerator pedal for 3 seconds or more, then hold it partway open for 3 seconds or more, and then fully open it for 3 seconds or more.

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

    9. Confirm that the DTC is not output.


      Powertrain > Engine > Trouble Codes
      Result
      Proceed to
      NEXT

    NEXT

    END