ECD SYSTEM(for 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).

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 position sensor circuit

  • Accelerator pedal position sensor

  • ECM

Comes on

DTC stored
Table 1. 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).

Tip:

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

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick 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 CONNECTORClick 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 to ON.

    6. 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.

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

      Powertrain > Engine > Trouble Codes

    8. Read the DTCs.

      Result

      Proceed to

      DTC P2121 is output

      DTC is not output
    DTC is not output

    END

    DTC P2121 is output

  5. REPLACE ECM

    1. Replace the ECM.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick 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 to ON.

    6. 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.

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

      Powertrain > Engine > Trouble Codes

    8. Confirm that the DTC is not output again.

    Result

    Proceed to

    NEXT
    NEXT

    END