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How To Proceed System Troubleshooting

  1. VEHICLE BROUGHT IN TO WORKSHOP 
    1. GO TO NEXT STEP 
  2. PROBLEM SYMPTOM CONFIRMATION 
    1. GO TO NEXT STEP 
  3. INSPECT COMMUNICATION FUNCTION OF LARGE-SCALE BODY COMMUNICATION SYSTEM (BEAN) 
    1. Check there is no abnormality in the communication system by inspecting the communication function of the body multiplex communication system with the LEXUS hand-held tester.
      1. (ECU unconnected, communication line abnormal) With code outputs, proceed to "A".
      2. (ECU unconnected, communication line abnormal) Without code outputs, proceed to "B".
    1. B: GO TO SECTION OF EACH SYSTEM 
    2. A: GO TO NEXT STEP 
  4. DIAGNOSTIC TROUBLE CODE CHECK (See  DIAGNOSTIC TROUBLE CODE CHART  ) 
    1. Check a DTC and note it if a code is output.
    2. Delete the DTC.
    3. Check if the DTC will be output once again, when the problem symptom is simulated based on the noted code.
      1. When no code is output (symptom check and simulation is possible), proceed to "A".
      2. When no code is output (symptom check and simulation is impossible), proceed to "B".
      3. When a code is output, proceed to C.
    1. B: GO TO PROBLEM SIMULATION 
    2. C: Go to step   7 
    3. A: GO TO NEXT STEP 
  5. PROBLEM SYMPTOMS TABLE (See  PROBLEM SYMPTOMS TABLE  ) 
    1. Without applicable symptoms, proceed to A
    2. With applicable symptoms, proceed to B
    1. B: Go to step   7 
    2. A: GO TO NEXT STEP 
  6. ACCORDING TO PROBLEM SYMPTOM, PERFORM TROUBLESHOOTING 
    1. PRE-CHECK (See PRE-CHECK )
    2. TERMINAL OF ECU (See TERMINALS OF ECU )
  7. ADJUSTMENT, REPAIR OR REPLACE 
    1. GO TO NEXT STEP 
    2. END 
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