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Home >> Subaru >> 2004 >> Forester XT, Standard >> Repair and Diagnosis (Single Page) >> Engine Performance >> Theory and Operation >> Diagnostic Trouble Code (DTC) Detecting Criteria (H4DOTC) >> Diagnostic Trouble Code (DTC) Detecting Criteria >> DTC P0605: Internal Control Module Read Only Memory (ROM) Error
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DTC P0605: Internal Control Module Read Only Memory (ROM) Error

  1. OUTLINE OF DIAGNOSIS 

    Judge NG when SUM value of ROM is out of the standard value.

  2. ENABLE CONDITION 
    ENABLE CONDITION CHART

    Secondary Parameters Enable Conditions
    Ignition switch ON
  3. GENERAL DRIVING CYCLE 

    Always perform the diagnosis continuously.

  4. DIAGNOSTIC METHOD 
    • Abnormality Judgment 

      Judge NG when the continuous time of completing the malfunction criteria below becomes more than 0.5 seconds.

      Judgment Value 

      JUDGMENT VALUE CHART

      Malfunction Criteria Threshold Value
      SUM value of ROM Standard value

      Time Needed for Diagnosis:  Undecided

      Malfunction Indicator Light Illumination:  Illuminates as soon as malfunction occurs.

  5. DTC CLEAR CONDITION 
    • When the OK idling cycle was completed 40 times in a row
    • When "Clear Memory" was performed (Only at engine stop)
  6. MALFUNCTION INDICATOR LIGHT CLEAR CONDITION 
    • When the OK driving cycle was completed 3 times in a row
    • When "Clear Memory" was performed
  7. FAIL SAFE 

    Stop the current to electric control throttle motor. (Fix the throttle opening angle to 6°.)

  8. ECM OPERATION AT DTC SETTING 

    Memorize the freeze frame data. (For test mode $02)