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Home >> Toyota >> 2008 >> Highlander Hybrid >> Repair and Diagnosis >> Engine Performance >> Engine Control System (Hybrid) >> SFI System >> DTC P0604 Internal Control Module Random Access Memory (RAM) Error >> Inspection Procedure

Inspection Procedure

  1. CHECK WHETHER DTC OUTPUT RECURS (DTC P0604) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG) and turn the Techstream on.
    3. Clear the DTCs (See DTC CHECK / CLEAR ).
    4. Turn the power switch off and turn the Techstream off.
    5. Disconnect the battery negative terminal and wait for 1 minute.
    6. Connect the battery negative terminal.
    7. Turn the power switch on (IG) and turn the Techstream on.
    8. Select the following menu items: Powertrain / Engine and ECT / Trouble Codes.
    9. Read the DTCs.

    Result 

    RESULT CHART

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

    B: CHECK FOR INTERMITTENT PROBLEMS  (See CHECK FOR INTERMITTENT PROBLEMS  )

    A: REPLACE HYBRID VEHICLE CONTROL ECU  (See REMOVAL )

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