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How To Proceed With Troubleshooting

WARNING: This page is about a different car, the 2008 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.
  1. VEHICLE BROUGHT TO WORKSHOP 
  2. PROBLEM SYMPTOM CONFIRMATION 
  3. CHECK MULTIPLEX COMMUNICATION SYSTEM 

    Refer to the how to proceed with troubleshooting (See HOW TO PROCEED WITH TROUBLESHOOTING ).

    1. Check for output DTCs.

      Result 

      RESULT REFERENCE

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

      HINT:

      The ECM 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 SYSTEM "

    A: Go to next step 

  4. CHECK CAN COMMUNICATION SYSTEM 

    Refer to the precaution (See PRECAUTION ).

    1. Check for output DTCs.

      Result 

      RESULT REFERENCE

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

      HINT:

      The ECM 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 the DTC CHECK/CLEAR  .

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

    Refer to the DTC CHECK/CLEAR  .

    Result 

    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 the DIAGNOSTIC TROUBLE CODE CHART  .

    NEXT:  Go to STEP  11

  8. PROBLEM SYMPTOM SIMULATION 

    Result 

    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 the electronic circuit inspection procedure (See ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).

  10. PROBLEM SYMPTOMS TABLE 

    Refer to the PROBLEM SYMPTOMS TABLE  .

  11. CIRCUIT INSPECTION 
  12. TERMINALS OF ECU 

    Refer to the TERMINALS OF ECU  .

  13. IDENTIFICATION OF PROBLEM 
  14. REPAIR OR REPLACE 
  15. CONFIRMATION TEST 

    NEXT : END 

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