ECD SYSTEM (w/o 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 Difference between VPA and VPA2 less than 0.4 V, or more than 1.2 V for 0.5 seconds (1 trip detection logic)

  • Accelerator Pedal Position (APP) sensor

  • ECM

WIRING DIAGRAM

Refer to DTC P2120 Click here.

INSPECTION PROCEDURE

Tech Tips

Read freeze frame data using an intelligent tester. Freeze frame data records the engine condition when a malfunction is 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.

Note

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

PROCEDURE


  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2121)


    1. Connect an intelligent tester to the DLC3.

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

    3. Select the following menu items: Powertrain / Engine / DTC.

    4. Read DTCs.

      Result
      Display (DTC Output) Proceed to
      P2121 A
      P2121 and other DTCs B

      Tech Tips

      If any DTCs other than P2121 are output, troubleshoot those DTCs first.


    B

    GO TO DTC CHART

    A

  2. READ VALUE USING INTELLIGENT TESTER (ACCELERATOR POSITION NO. 1 AND ACCELERATOR POSITION NO. 2)

    A01KHAPE49
    Text in Illustration
    *a Depressed
    *b Released

    1. Connect an intelligent tester to the DLC3.

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

    3. Select the following menu items: Powertrain / Engine / Data List / Accelerator Position No. 1 and Accelerator Position No. 2.

    4. Read the values displayed on the tester.

      Standard voltage
      Accelerator Pedal Operations Accelerator Position No. 1 Accelerator Position No. 2
      Released 0.5 to 1.1 V 0.9 to 2.3 V
      Depressed 3.0 to 4.6 V 3.4 to 5.0 V

    OK

    CHECK FOR INTERMITTENT PROBLEMS

    NG

  3. REPLACE ACCELERATOR PEDAL ASSEMBLY


    NEXT

  4. CHECK WHETHER DTC OUTPUT RECURS (DTC P2121)


    1. Connect an 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. Select the following menu items: Powertrain / Engine / DTC.

    7. Read DTCs.

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

    B

    SYSTEM OK

    A

    REPLACE ECM