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

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

Refer to DTC P2120 (Click here).

Table 1. P2121
DTC Detection Drive Pattern DTC Detection Condition Trouble Area

Ignition switch ON


  • Accelerator pedal fully closed for 3 seconds

  • Accelerator pedal open partway for 3 seconds

  • Accelerator pedal fully open 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
Table 2. Related Data List
DTC No. Data List
P2121

  • Accel Sens. No.1 Volt %

  • Accel Sens. No.2 Volt %

  • Accel Sensor Out No.1

  • Accel Sensor Out No.2
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WIRING DIAGRAM

Refer to DTC P2120 (Click here).

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INSPECTION PROCEDURE

Note:

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

Tip:

Read freeze frame data using the intelligent tester. 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.

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PROCEDURE


  1. Click here

    READ VALUE USING INTELLIGENT TESTER (ACCELERATOR PEDAL POSITION SENSOR)


    1. A015CLQE02

      Connect the intelligent tester to the DLC3.

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

    3. Enter the following menus: Powertrain / Engine / 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%
      Table 3. Result
      Result Proceed to
      NG A
      OK B

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


    1. A0157YZE35

      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 (Check for Open)
      Table 4. 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
      Table 5. 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
      Standard Resistance (Check for Short)
      Table 6. for LHD
      Tester Connection Condition Specified Condition
      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
      Table 7. for RHD
      Tester Connection Condition Specified Condition
      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

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    REPLACE ACCELERATOR PEDAL ROD ASSEMBLY


    1. Replace the accelerator pedal rod assembly (Click here).


  4. Click here

    CHECK WHETHER DTC OUTPUT RECURS (DTC P2121)


    1. Connect the intelligent tester to the DLC3.

    2. Clear the DTCs (Click here).

    3. Turn the ignition switch off.

    4. Turn the ignition switch to ON.

    5. Fully close the accelerator pedal for 3 seconds, then hold it partway open for 3 seconds, then fully open it for 3 seconds.

    6. Enter the following menus: Powertrain / Engine / DTC.

    7. Read the DTCs.

      Table 8. Result
      Result Proceed to
      P2121 is output A
      No DTC is output B

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    REPLACE ECM


    1. Replace the ECM (Click here).


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    REPAIR OR REPLACE HARNESS OR CONNECTOR


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    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the intelligent tester to the DLC3.

    2. Clear the DTCs (Click here).

    3. Turn the ignition switch off.

    4. Turn the ignition switch to ON.

    5. Fully close the accelerator pedal for 3 seconds, then hold it partway open for 3 seconds, then fully open it for 3 seconds.

    6. Enter the following menus: Powertrain / Engine / DTC.

    7. Confirm that the DTC is not output again.


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    END