ECD SYSTEM (w/ EGR Cooler Bypass Valve), 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. DTC Detection Condition Trouble Area
P2121

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

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.

Tech Tips

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 running or stopped, if the engine was warmed up or not, and other data from the time the malfunction occurred.

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (ACCELERATOR PEDAL POSITION SENSOR)


    1. A01KHX3E04
      Text in Illustration
      *1 Accelerator Pedal
      *a Depressed
      *b Released

      Connect the intelligent tester to the DLC3.

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

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

    4. Read values.

      Standard
      Accelerator Pedal Accel Sens. No.1 Volt % Accel Sens. No.2 Volt %
      Released 8 to 28% 51 to 86%
      Depressed 30 to 55% 73 to 98%
      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 A26 accelerator pedal position sensor connector.

    2. Disconnect the E16 and E17 ECM connectors.

    3. Measure the resistance according to the values in the table below.

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      A26-1 (VCP2) - E16-4 (VCP2) Always Below 1 Ω
      A26-2 (EP2) - E16-3 (EPA2) Always Below 1 Ω
      A26-3 (VPA2) - E17-1 (VPA2) Always Below 1 Ω
      A26-4 (VCPA) - E16-6 (VCPA) Always Below 1 Ω
      A26-5 (EPA) - E16-5 (EPA) Always Below 1 Ω
      A26-6 (VPA) - E17-2 (VPA) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      A26-1 (VCP2) or E16-4 (VCP2) - Body ground Always 10 kΩ or higher
      A26-2 (EPA2) or E16-3 (EPA2) - Body ground Always 10 kΩ or higher
      A26-3 (VPA2) or E17-1 (VPA2) - Body ground Always 10 kΩ or higher
      A26-4 (VCPA) or E16-6 (VCPA) - Body ground Always 10 kΩ or higher
      A26-5 (EPA) or E16-5 (EPA) - Body ground Always 10 kΩ or higher
      A26-6 (VPA) or E17-2 (VPA) - Body ground Always 10 kΩ or higher

    4. Reconnect the accelerator pedal position sensor connector.

    5. Reconnect the ECM connectors.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  3. REPLACE ACCELERATOR PEDAL ROD ASSEMBLY (ACCELERATOR LINK ASSEMBLY)


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


    NEXT

  4. CHECK WHETHER DTC OUTPUT RECURS (DTC P2121)


    1. Connect the intelligent tester to the DLC3.

    2. Clear DTCs Click here.

    3. Turn the ignition switch to ON.

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

    5. Select the following menus: Powertrain / Engine and ECT / DTC.

    6. Read 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 intelligent tester to the DLC3.

    2. Clear 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. Select the following menus: Powertrain / Engine and ECT / DTC.

    7. Confirm that the DTC is not output again.


    NEXT

    END