ECD SYSTEM (w/o EGR Cooler), 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

Condition (a) continues for 2 seconds:

(a) Difference between VPA1 and VPA2 exceeds the threshold

(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 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 INTELLIGENT TESTER (ACCEL SENS. NO.1 VOLT % AND ACCEL SENS. NO.2 VOLT %)


    1. A01DZASE07

      Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch 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%

    OK

    REPLACE ECM Click here

    NG

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


    1. A01E2PSE20

      Disconnect the A13 sensor connector.

    2. Disconnect the E5 ECM connector.

    3. Measure the resistance of the wire harness side connectors.

      Standard resistance (Check for open)
      Tester Connection Specified Condition
      VCP2 (A13-1) - VCP2 (E5-27) Below 1 Ω
      EPA2 (A13-2) - EPA2 (E5-29) Below 1 Ω
      VPA2 (A13-3) - VPA2 (E5-23) Below 1 Ω
      VCPA (A13-4) - VCPA (E5-26) Below 1 Ω
      EPA (A13-5) - EPA (E5-28) Below 1 Ω
      VPA (A13-6) - VPA (E5-22) Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Specified Condition
      VCP2 (A13-1) or VCP2 (E5-27) - Body ground 10 kΩ or higher
      EPA2 (A13-2) or EPA2 (E5-29) - Body ground 10 kΩ or higher
      VPA2 (A13-3) or VPA2 (E5-23) - Body ground 10 kΩ or higher
      VCPA (A13-4) or VCPA (E5-26) - Body ground 10 kΩ or higher
      EPA (A13-5) or EPA (E5-28) - Body ground 10 kΩ or higher
      VPA (A13-6) or VPA (E5-22) - Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    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 intelligent tester to the DLC3.

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

    3. Clear DTCs Click here.

    4. Start the engine.

    5. Allow the engine to idle for 15 seconds.

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

    7. Read the DTCs.

      Result
      Display (DTC Output) Proceed to
      P2121 A
      No output B

    B

    SYSTEM OK

    A

    REPLACE ECM Click here