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How To Proceed With Troubleshooting

WARNING: This page is about a different car, the 2004 Lexus SC 430. However, it is still accessible from the selected car via links, so may be relevant.
  1. VEHICLE BROUGHT TO WORKSHOP 
    • GO TO NEXT STEP 
  2. CUSTOMER PROBLEM ANALYSIS CHECK AND PROBLEM SYMPTOM CONFIRMATION 
    • GO TO NEXT STEP 
  3. INSPECT COMMUNICATION FUNCTION OF LARGE-SCALE BODY MULTIPLEX COMMUNICATION SYSTEM (BEAN) 
    1. Check that there is no abnormality in the communication system by inspecting the communication function of the body multiplex communication system with the hand-held tester.
      1. (ECU unconnected, communication line abnormal) Without code output, proceed to A.
      2. (ECU unconnected, communication line abnormal) With code output, proceed to B.
    1. B: GO TO MULTIPLEX COMMUNICATION SYSTEM (See  HOW TO PROCEED WITH TROUBLESHOOTING  ) 
    2. A: Go to next step. 
  4. (See PROBLEM SYMPTOMS TABLE )
    1. Without applicable problem symptoms table, proceed to A.
    2. With an applicable problem symptoms table, proceed to B.
    1. B: GO TO STEP   6 . 
    2. A: Go to next step. 
  5. ACCORDING TO PROBLEM SYMPTOM, PERFORM TROUBLESHOOTING 
    1. (See PRE-CHECK )
      1. Inspection with the hand-held tester (ECU data monitor)
      2. Inspection with the hand-held tester (Active test)
    2. (See TERMINALS OF ECU )
  6. ADJUST, REPAIR OR REPLACE 
    • GO TO NEXT STEP 
  7. CONFIRMATION TEST 
    1. END 
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