ECD SYSTEM (w/ EGR Cooler Bypass Valve), Diagnostic DTC:P1601

DTC Code DTC Name
P1601 Injector Correction Circuit Malfunction (EEPROM)

DESCRIPTION

DTC No. DTC Detection Condition Trouble Area
P1601

When any condition below is met (1 trip detection logic):


  • Fuel injector compensation code is not registered.

  • Wrong injector compensation code is registered.

  • Fuel injector pilot quantity learning value is not registered.

  • Fuel injector compensation code

  • Fuel injector pilot quantity learning value

  • ECM

Note


  • When the fuel injector assembly is replaced, the new fuel injector compensation code must be input into the ECM. When the ECM is replaced, all of the existing fuel injector compensation codes must be input into the new ECM.

  • Fuel injector compensation codes are unique, 30-digit, alphanumeric values printed on the head portion of each fuel injector assembly. If an incorrect fuel injector compensation code is input into the ECM, the engine assembly may rattle or engine idling may become rough. In addition, engine failure may occur and the life of the engine may be shortened.

  • When the fuel injector assembly is replaced, perform pilot quantity learning. When the ECM is replaced, all of the existing fuel injector pilot quantity learning values must be input into the new ECM.

Tech Tips

When replacing the ECM with a new one, if the injector compensation code and/or injector pilot quantity learning value are not entered, DTC P1601 will be stored.


  1. When replacing the ECM with a new one, input all learning values and codes into the new ECM as follows:


    1. Prior to replacing the ECM, use the intelligent tester to read and save each learning value and code from the original ECM Click here.

    2. After installing a new ECM, input the saved learning values and codes into the new ECM using the tester Click here.

    3. Turn the ignition switch off and turn the tester off.

    4. Wait for at least 30 seconds.

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

    6. Clear DTC P1601 stored in the ECM using the tester Click here.

      Tech Tips


      • Each fuel injector assembly has different fuel injection characteristics. In order to optimize the fuel injections, the ECM uses the compensation codes to balance the different fuel injections between each fuel injector assembly.

      • When you first turn the ignition switch to ON after replacing the ECM and other component(s), DTC P1601 is stored. Manually clear the DTC upon completion of compensation code registration.

        Replacement Part Utility Item
        ECM
        Fuel injector assembly

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. LEARNING VALUES CONFIRMATION


    1. Connect the intelligent tester to the DLC3.

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

      Note

      Do not start the engine.

    3. Select the following menus: Powertrain / Engine and ECT / Utility / Learning values confirmation Click here.

      Result
      Result Proceed to
      The injector compensation codes are not input A
      The injector compensation codes registered in the ECM are different than the codes imprinted on the fuel injector assemblies A
      The pilot quantity learning values are set to the default values. B
      Except above C

      Tech Tips

      When the fuel injector pilot quantity learning values are set to the default values, "7FFF" is displayed.


    B

    LEARNING VALUES WRITE Click here

    C

    CHECK DTC OUTPUT Click here

    A

  2. REGISTER INJECTOR COMPENSATION CODE


    1. Register the injector compensation code Click here.


    NEXT

    PILOT QUANTITY LEARNING Click here

  3. LEARNING VALUES WRITE

    Tech Tips

    When replacing the ECM, after performing "Learning Values Save" to save the learned values from the old ECM using the intelligent tester and replacing the old ECM with a new one, "Learning Values Write" was not performed using the intelligent tester causing this DTC to be output.


    1. Install the old ECM.

    2. Connect the intelligent tester to the DLC3.

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

    4. Select the following menus: Powertrain / Engine and ECT / Utility / Learning values save Click here.

    5. Remove the old ECM.

    6. Install the new ECM.

    7. Select the following menus: Powertrain / Engine and ECT / Utility / Learning values write Click here.


    NEXT

  4. LEARNING VALUES CONFIRMATION


    1. Connect the intelligent tester to the DLC3.

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

      Note

      Do not start the engine.

    3. Select the following menus: Powertrain / Engine and ECT / Utility / Learning values confirmation Click here.

      Result
      Result Proceed to
      The pilot quantity learning values are set to the default values. A
      Except above B

      Tech Tips

      When the fuel injector pilot quantity learning values are set to the default values, "7FFF" is displayed.


    B

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

    A

  5. PILOT QUANTITY LEARNING


    1. Perform the fuel injector pilot quantity learning Click here.


    NEXT

  6. CHECK DTC OUTPUT


    1. Connect the intelligent tester to the DLC3.

    2. Clear the DTCs Click here.

    3. Turn the ignition switch off and leave the vehicle for 30 seconds or more.

    4. Turn the ignition switch to ON for 1 second.

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

    6. Read DTCs.

      Result
      Result Proceed to
      No DTC is output A
      P1601 is output B

    B

    REPLACE ECM Click here

    A

    END

  7. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT

  8. 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 and leave the vehicle for 30 seconds or more.

    4. Turn the ignition switch to ON for 1 second.

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

    6. Confirm that the DTC is not output again.


    NEXT

    END