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Home >> Toyota >> 2008 >> Matrix Base, Standard >> Repair and Diagnosis >> Engine Performance >> Engine Control System (1ZZ-FE) >> SFI System >> DTC P0604 Internal Control Module Random Access Memory (RAM) Error >> Inspection Procedure
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Inspection Procedure

  1. CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC P0604) 
    1. Connect Techstream to the DLC3.
    2. Turn the ignition switch to the ON position.
    3. Turn the tester on.
    4. Clear the DTC (See DTC CHECK / CLEAR  ).
    5. Turn the ignition switch off.
    6. Disconnect the battery negative terminal and wait for 1 minute.
    7. Connect the battery negative terminal.
    8. Turn the ignition switch to the ON position.
    9. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
    10. Read the DTCs.

      Result 

      DTC RESULT DESCRIPTION CHART

      Display (DTC output) Proceed to
      P0604 A
      No output DTC B

    B : CHECK FOR INTERMITTENT PROBLEMS 

    A : REPLACE ECM (See  REMOVAL   ) 

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