SFI SYSTEM(w/ Canister Pump Module), Diagnostic DTC:P0604

DTC Code DTC Name
P0604 Random Access Memory (RAM)

MONITOR 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 Random Access Memory (RAM) errors. If outputs from these CPUs are different and deviate from the standard, the ECM illuminates the MIL and stores the DTC immediately.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P0604 Random Access Memory (RAM) ECM RAM error (1 trip detection logic). ECM Comes on DTC stored

MONITOR STRATEGY

Required Sensors/Components ECM
Frequency of Operation Continuous

CONFIRMATION DRIVING PATTERN


  1. Turn the engine 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 engine switch on (IG) and wait for 16 seconds or more.

CAUTION / NOTICE / HINT

Tech Tips

Read freeze frame data using the GTS. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. 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. READ OUTPUT DTC (DTC P0604)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs.

      Click here


      Powertrain > Engine and ECT > Clear DTCs

    5. Turn the engine switch off and turn the GTS off.

    6. Disconnect the GTS.

    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 GTS to the DLC3.

    10. Turn the engine switch on (IG).

    11. Turn the GTS on.

    12. Wait 16 seconds or more.

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

    14. Read the DTCs.


      Powertrain > Engine and ECT > Trouble Codes
      Result
      Result Proceed to
      DTC is not output A
      DTC P0604 is output B

    A

    CHECK FOR INTERMITTENT PROBLEMS Click here

    B

    REPLACE ECM Click here