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How To Proceed With Troubleshooting

WARNING: This page is about a different car, the 2006 Lexus RX 400h. However, it is still accessible from the selected car via links, so may be relevant.
  1. VEHICLE BROUGHT TO WORKSHOP 

    NEXT 

  2. PROBLEM SYMPTOM CONFIRMATION 

    NEXT 

  3. CHECK MULTIPLEX COMMUNICATION SYSTEM 

    Refer to HOW TO PROCEED WITH TROUBLESHOOTING .

    1. Check for output DTCs.

      Result 

      DTC RESULT REFERENCE

      Result Proceed to
      MPX DTC is not output A
      MPX DTC is output B

      HINT:

      The hybrid vehicle control ECU of this system is connected to the multiplex communication system. Therefore, before starting troubleshooting, make sure to check that there is no trouble in the multiplex communication system.

    B : PROCEED TO " MULTIPLEX COMMUNICATION  " 

    A : GO TO NEXT STEP 

  4. CHECK CAN COMMUNICATION SYSTEM 

    Refer to PRECAUTION .

    1. Check for output DTCs.

      Result 

      DTC RESULT REFERENCE

      Result Proceed to
      CAN DTC is not output A
      CAN DTC is output B

      HINT:

      The hybrid vehicle control ECU of this system is connected to the CAN communication system.

      Therefore, before starting troubleshooting, make sure to check that there is no trouble in the CAN communication system.

    B : PROCEED TO " CAN COMMUNICATION SYSTEM  " 

    A : GO TO NEXT STEP 

  5. DTC CHECK AND CLEAR 

    Refer to DTC CHECK / CLEAR  .

    NEXT 

  6. DTC CHECK (OTHER THAN MPX AND CAN SYSTEM DTC) 

    Refer to DTC CHECK / CLEAR  .

    Result 

    DTC RESULT REFERENCE

    Result Proceed to
    DTC is not output A
    DTC is output B

    A : GO TO STEP   8 

    B : GO TO NEXT STEP 

  7. DTC CHART 

    Refer to DIAGNOSTIC TROUBLE CODE CHART  .

    NEXT : GO TO STEP   11 

  8. PROBLEM SYMPTOM SIMULATION 

    Result 

    DTC RESULT REFERENCE

    Result Proceed to
    Fault is not listed in problem symptoms table A
    Fault is listed in problem symptoms table B

    B : GO TO STEP   10 

    A : GO TO NEXT STEP 

  9. SYMPTOM SIMULATION 

    Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE .

    NEXT 

  10. PROBLEM SYMPTOMS TABLE 

    Refer to PROBLEM SYMPTOMS TABLE  .

    NEXT 

  11. CIRCUIT INSPECTION 

    NEXT 

  12. TERMINALS OF ECU 

    Refer to TERMINALS OF ECU  .

    NEXT 

  13. IDENTIFICATION OF PROBLEM 

    NEXT 

  14. REPAIR OR REPLACE 

    NEXT 

  15. CONFIRMATION TEST 

    NEXT : END 

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