2006 Lexus LS 430FACTORY OEM SERVICE PROCEDURE

How To Proceed With Troubleshooting

  1. VEHICLE BROUGHT TO WORKSHOP 
  2. (See  CUSTOMER PROBLEM ANALYSIS CHECK   ) 
  3. CONNECT OBD HAND-HELD TESTER TO DLC3 

    HINT:

    If the display indicates a communication fault in the tool, inspect the DLC3.

  4. CHECK DTC AND FREEZE FRAME DATA (See  DTC CHECK/CLEAR   ) 

    HINT:

    Record or print DTC and freeze frame data, if needed.

  5. CLEAR DTC AND FREEZE FRAME DATA (See  DTC CHECK/CLEAR   ) 
  6. VISUAL INSPECTION 
  7. SETTING CHECK (TEST) MODE DIAGNOSIS (See  CHECK MODE PROCEDURE   ) 
  8. PROBLEM SYMPTOM CONFIRMATION 

    HINT:

    If the engine does not start, perform steps 10 and 12 first.

    OUTPUT RESULT TABLE

    Result Proceed to
    Malfunction does not occur A
    Malfunction occurs B

    B: Go to step 10 

    A: Go to next step. 

  9. SYMPTOM SIMULATION 
  10. (See  DTC CHECK/CLEAR   ) 
    OUTPUT RESULT TABLE

    Result Proceed to
    Malfunctioning code A
    No code B

    B: Go to step 12 

    A: Go to next step. 

  11. (See  DIAGNOSTIC TROUBLE CODE CHART   ) 

    Go to step 14 

  12. See  BASIC INSPECTION   ) 
    OUTPUT RESULT TABLE

    Result Proceed to
    Malfunctioning parts not confirmed A
    Malfunctioning parts confirmed B

    B: Go to step 17 

    A: Go to next step. 

  13. See  PROBLEM SYMPTOMS TABLE   ) 
    OUTPUT RESULT TABLE

    Result Proceed to
    Malfunctioning circuit confirmed A
    Malfunctioning parts confirmed B

    B: Go to step 17 

    A: Go to next step. 

  14. CHECK  ECM POWER SOURCE CIRCUIT  
  15. CIRCUIT INSPECTION 
    OUTPUT RESULT TABLE

    Result Proceed to
    Malfunction not confirmed A
    Malfunction confirmed B

    B: Go to step 18 

    A: Go to next step. 

  16. See  CHECK FOR INTERMITTENT PROBLEMS   ) 

    Go to step 18 

  17. PARTS INSPECTION 
  18. IDENTIFICATION OF PROBLEM 
  19. ADJUSTMENT, REPAIR 
  20. CONFIRMATION TEST 

    END 

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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