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How To Proceed With Troubleshooting

WARNING: This page is about a different car, the 2004 Lexus GX 470. 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  HOW TO PROCEED WITH TROUBLESHOOTING  ) 
  4. PROBLEM SYMPTOM CONFIRMATION 
    1. SYMPTOM DOES NOT OCCUR (Go to step 5) 
    2. SYMPTOM OCCURS (Go to step   6 .) 
  5. SYMPTOM SIMULATION (SEE  HOW TO PROCEED WITH TROUBLESHOOTING  ) 
  6. CHECK DTC (SEE  PRE-CHECK  ) 
    1. DTC IS OUTPUT (Go to step 7) 
    2. DTC IS NOT OUTPUT (Go to step   8 .) 
  7. DTC CHART (SEE  DIAGNOSTIC TROUBLE CODE CHART  
    1. Go to step   11 . 
  8. CHECK IF THE SAME SYMPTOM APPEARS IN THE NAVIGATION SYSTEM (SEE  PROBLEM SYMPTOMS TABLE  ) 
    1. The symptom appears (Follow the navigation symptom chart to perform troubleshooting) 
    2. The symptom does not appear (Go to step 9) 
  9. PROBLEM SYMPTOMS TABLE (SEE  PROBLEM SYMPTOMS TABLE  
    1. The corresponding symptom exists (Go to step   11 .) 
    2. 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. ADJUST, REPAIR OR REPLACE 
  12. CONFIRMATION TEST 

    END 

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