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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 
  2. CUSTOMER PROBLEM ANALYSIS 
  3. CHECK AND CLEAR DTCs 
    1. Refer to the diagnostic check/clear (See DTC CHECK / CLEAR  ).
  4. PROBLEM SYMPTOM CONFIRMATION 

    SYMPTOM DOES NOT OCCUR (Go to step 5) 

    SYMPTOM OCCURS (Go to step   6 ) 

  5. SYMPTOM SIMULATION 
  6. CHECK CAN COMMUNICATION SYSTEM 
    1. Refer to the CAN COMMUNICATION SYSTEM (See ).

      HINT:

      This ECU is connected to the CAN communication system. Therefore, be sure to check that there are no trouble in the CAN communication system before performing troubleshooting.

  7. CHECK DTC 

    DTC IS OUTPUT (Go to step   11 ) 

    DTC IS NOT OUTPUT (Go to step 8) 

  8. CHECK IF THE SAME SYMPTOM APPEARS IN THE NAVIGATION SYSTEM 
    1. Refer to the LEXUS navigation system (See PROBLEM SYMPTOMS TABLE ).

    The symptom appears (Follow the navigation symptom chart to perform troubleshooting) 

    The symptom does not appear (Go to step 9) 

  9. PROBLEM SYMPTOMS TABLE 
    1. Refer to the PROBLEM SYMPTOMS TABLE  .

    The corresponding symptom exists (Go to step   11 ) 

    The corresponding symptom does not exist (Go to step 10) 

  10. BASED ON THE MALFUNCTION SYMPTOM, PERFORM TROUBLESHOOTING BELOW 
    1. See TERMINALS OF ECU  .
  11. ADJUSTMENT, REPAIR OR REPLACE 
  12. CONFIRMATION TEST 

    END 

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