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. It is diagnosed by internal "mirroring" of the main CPU and sub CPU to detect the Random Access Memory (RAM) errors. If outputs from these CPUs are different and deviate from the standard, the ECM will illuminate the MIL and set a DTC immediately.

DTC No. DTC Detection Condition Trouble Area
P0604

ECM RAM errors

(1 trip detection logic)

 ECM

INSPECTION PROCEDURE

Tech Tips

Read freeze frame data using the intelligent tester. 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, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE


  1. CHECK DTC


    1. Clear DTC Click here.

    2. Turn the power switch off.

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

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

    5. Connect the intelligent tester to the DLC3.

    6. Turn the power switch on (IG).

    7. Turn the tester ON.

    8. Wait 16 seconds or more.

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

    10. Check DTC.

      OK
      P0604 is not present.

    NG

    REPLACE ECM Click here

    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here