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Home >> Toyota >> 2011 >> Highlander Limited, AWD >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System (2GR-FE) (Diagnostic Codes (P00351-P1603) & Circuit Tests) >> SFI System >> DTC P0604: Internal Control Module Random Access Memory (RAM) Error >> Procedure

DTC P0604: Internal Control Module Random Access Memory (RAM) Error: Procedure

  1. READ DTC OUTPUT (DTC P0604) 
    1. Clear the DTC.
    2. Turn the ignition switch OFF.
    3. Disconnect the battery negative terminal and wait for 1 minute.
    4. Connect the battery negative terminal.
    5. Turn the ignition switch on (IG).
    6. Select the following menu items: Powertrain / Engine and ECT / Trouble Codes.
    7. Read the DTCs.

      OK

      P0604 is not present.

    NG → See step   3 

    OK → See step   2 

  2. CHECK FOR INTERMITTENT PROBLEMS. Refer to  CHECK FOR INTERMITTENT PROBLEMS 
  3. REPLACE ECM. Refer to  COMPONENTS 
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