ECD SYSTEM, Diagnostic DTC:P2620,P2621 and P2622

DTC Code DTC Name
P2620 Throttle Position Output Circuit / Open
P2621 Throttle Position Output Circuit Low
P2622 Throttle Position Output Circuit High

DESCRIPTION

Refer to DTC P0122.

Click here

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

P2620

Throttle Position Output Circuit / Open

Open or short in diesel throttle body assembly circuit for 0.22 seconds.

(3 trip detection logic)

  • Open or short in diesel throttle body assembly circuit

  • Diesel throttle body assembly

  • ECM

Does not come on

DTC stored

P2621

Throttle Position Output Circuit Low

Short to ground in diesel throttle body assembly circuit for 0.22 seconds.

(3 trip detection logic)

  • Open or short in diesel throttle body assembly circuit

  • Diesel throttle body assembly

  • ECM

Does not come on

DTC stored

P2622

Throttle Position Output Circuit High

Short to +B in diesel throttle body assembly circuit for 0.22 seconds.

(3 trip detection logic)

  • Open or short in diesel throttle body assembly circuit

  • Diesel throttle body assembly

  • ECM

Does not come on

DTC stored

WIRING DIAGRAM

Refer to DTC P0122.

Click here

CAUTION / NOTICE / HINT

Note:

When replacing the ECM, the ECM needs registration and initialization.

Click here

Tip:

  • When the ECM must be replaced, before replacing the ECM, perform the "Learning Values Save" function using the GTS. Then after installing the new ECM, perform all of the initialization/registrations for the "Learning Values Write" function by following the instructions shown on the GTS display.

  • 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. CHECK HARNESS AND CONNECTOR (DIESEL THROTTLE BODY ASSEMBLY - ECM)

    1. Disconnect the diesel throttle body 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

      o1-4 (M+) - B112-50 (M+)

      Always

      Below 1 Ω

      o1-5 (M-) - B112-20 (M-)

      Always

      Below 1 Ω

      o1-4 (M+) or B112-50 (M+) - Body ground

      Always

      10 kΩ or higher

      o1-5 (M-) or B112-20 (M-) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTORClick here

    OK

  2. REPLACE DIESEL THROTTLE BODY ASSEMBLY

    1. Replace the diesel throttle body assembly.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

  3. CHECK WHETHER DTC OUTPUT RECURS (DTC P2620, P2621 AND/OR P2622)

    1. Connect the GTS to the DLC3.

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

    3. Clear the DTCs.

      Powertrain > Engine and ECT > Clear DTCs

    4. Turn the ignition switch off and wait for 60 seconds or more [A].

    5. Perform road test [B].

    6. Repeat [A] and [B] for the number of trips detected.

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

      Powertrain > Engine and ECT > Trouble Codes

    8. Read the DTC.

      Result

      Result

      Proceed to

      No DTC output

      A

      DTC P2620, P2621 and/or P2622

      B
    A

    END

    B

  4. REPLACE ECM

    1. Replace the ECM.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

  5. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

    1. Connect the GTS to the DLC3.

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

    3. Clear the DTCs.

      Powertrain > Engine and ECT > Clear DTCs

    4. Turn the ignition switch off and wait for 60 seconds or more [A].

    5. Perform road test [B].

    6. Repeat [A] and [B] for the number of trips detected.

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

      Powertrain > Engine and ECT > Trouble Codes

    8. Confirm that the DTC is not output again.

    Result

    Proceed to

    NEXT
    NEXT

    END

  6. REPAIR OR REPLACE HARNESS OR CONNECTOR

    1. Repair or replace the harness or connector.

    Result

    Proceed to

    NEXT
    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick here