ECD SYSTEM, Diagnostic DTC:P1601

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

DESCRIPTION

DTC No. DTC Detection Condition Trouble Area
P1601

Either condition below is met:


  • Injector compensation code is not registered (1 trip detection logic)

  • Incorrect injector compensation code is registered (1 trip detection logic)

  • Injector compensation code

  • ECM

Note


  • When an injector assembly is replaced, the injector compensation code must be input into the ECM.

    When the ECM is changed, all of the existing injector compensation codes must be input into the new ECM.

  • Injector compensation codes are unique, 30-digit, alphanumeric values printed on the head portion of each injector. If an incorrect 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.


  1. When replacing the ECM with a new one, input all the injector compensation codes into the new ECM as follows:


    1. Prior to replacing the ECM, use the intelligent tester to read and save each injector compensation code from the original ECM.

    2. After installing a new ECM, input the saved compensation codes into the new ECM using the tester.

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

    4. Wait for at least 30 seconds.

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

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

      Tech Tips


      • Each 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 injector assembly.

      • When first turning the ignition switch to ON after replacing the ECM or an injector(s), DTC P1601 is set. If an injector was replaced, the compensation code for the new injector will need to be registered in the ECM. If the ECM was replaced, the compensation codes for the injector assembly must be registered to the new ECM. Manually clear the DTCs upon completion of compensation code registration.

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. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was moving or stationary, whether the engine was warmed up or not, as well as other data recorded at the time of a malfunction.

PROCEDURE


  1. CHECK INJECTOR COMPENSATION CODE


    1. Read the injector compensation code Click here.

      OK
      Compensation codes stored in the ECM match compensation codes of the installed injector assemblies.

    NG

    PERFORM REGISTRATION OF INJECTOR COMPENSATION CODES Click here

    OK

    REPLACE ECM Click here