SFI SYSTEM, Diagnostic DTC:P0604

DTC Code DTC Name
P0604 Random Access Memory (RAM)

DESCRIPTION

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.

DTC No. DTC Detection Condition Trouble Area
P0604 ECM RAM errors (Main CPU and sub CPU mirroring failure) (1 trip detection logic). ECM

CONFIRMATION DRIVING PATTERN


  1. Turn the ignition switch off.

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

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

  4. Turn the ignition switch to ON and wait for 16 seconds or more.

PROCEDURE


  1. CHECK FOR DTC


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the intelligent tester on.

    4. Clear the DTCs Click here.

    5. Turn the intelligent tester off.

    6. Turn the ignition switch off.

    7. Disconnect the intelligent tester.

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

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

    10. Connect the intelligent tester to the DLC3.

    11. Turn the ignition switch to ON and turn the intelligent tester on.

    12. Wait 16 seconds or more.

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

    14. Check for DTCs.

      OK
      P0604 is not output.

    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

    NG

    REPLACE ECM Click here