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How To Proceed With Troubleshooting

WARNING: This page is about a different car, the 2004 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.
  1. VEHICLE BROUGHT TO WORKSHOP 
  2. CUSTOMER PROBLEM ANALYSIS (SEE  CUSTOMER PROBLEM ANALYSIS CHECK  ) 
  3. CHECK AND CLEAR DTCs (SEE  SERVICE CHECK MODE (DTC CHECK)  ,  SERVICE CHECK MODE (DTC CLEAR/RECHECK)  ) 
  4. PROBLEM SYMPTOM CONFIRMATION 

    SYMPTOM DOES NOT OCCUR (Go to step 5) 

    SYMPTOM OCCURS (Go to step   6 ) 

  5. SYMPTOM SIMULATION (SEE  HOW TO PROCEED WITH TROUBLESHOOTING  ) 
  6. CHECK CAN COMMUNICATION SYSTEM (SEE  HOW TO PROCEED WITH TROUBLESHOOTING  ) 

    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 (SEE  SERVICE CHECK MODE (DTC CHECK)  ) 

    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 (SEE  PROBLEM SYMPTOMS TABLE  ) 

    The symptom appears (Follow the navigation symptom chart to perform troubleshooting) (SEE  PROBLEM SYMPTOMS TABLE  ) 

    The symptom does not appear (Go to step 9) 

  9. PROBLEM SYMPTOMS TABLE (SEE  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. Terminals of ECU (see TERMINALS OF ECU ).
  11. ADJUSTMENT, REPAIR OR REPLACE 
  12. CONFIRMATION TEST 

    END 

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