SFI SYSTEM(w/o EGR System), Diagnostic DTC:P0604

The ECM continuously monitors its internal memory status. This self-check ensures that the ECM is functioning properly. The ECM memory status is diagnosed by internal "mirroring" of the main CPU and sub CPU to detect Random Access Memory (RAM) errors. If outputs from these CPUs are different and deviate from the standard, the ECM will illuminate the MIL and store a DTC immediately.

1. Connect the intelligent tester to the DLC3.

2. Turn the engine switch on (IG) and turn the tester on.

3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

4. Turn the tester off.

5. Turn the engine switch off.

6. Disconnect the intelligent tester.

7. Disconnect the cable from the negative (-) battery terminal and wait for 1 minute.

8. Connect the cable to the negative (-) battery terminal.

9. Connect the intelligent tester to the DLC3.

10. Turn the engine switch on (IG) and turn the tester on.

11. Wait 16 seconds or more.

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

13. Read the pending DTCs.

    Tip:

    • If a pending DTC is output, the system is malfunctioning.

    • If a pending DTC is not output, perform the following procedure.

14. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

15. Input the DTC: P0604.

16. Check the DTC judgment result.

    Tester Display	Description
    NORMAL	DTC judgment completed System normal
    ABNORMAL	DTC judgment completed System abnormal
    INCOMPLETE	DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions
    N/A	Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    Tip:

    • If the judgment result shows NORMAL, the system is normal.

    • If the judgment result shows ABNORMAL, the system has a malfunction.