2005 Lexus SC 430FACTORY OEM SERVICE PROCEDURE

How To Proceed With Troubleshooting

  1. VEHICLE BROUGHT TO WORKSHOP 
    1. NEXT: Go to next step. 
  2. CUSTOMER PROBLEM ANALYSIS (See  CUSTOMER PROBLEM ANALYSIS CHECK   ) 
    1. NEXT: Go to next step. 
  3. CONNECT OBD HAND-HELD TESTER TO DLC3 

    HINT:

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

    1. NEXT: Go to next step. 
  4. CHECK DTC AND FREEZE FRAME DATA (See  DTC CHECK/CLEAR   ) 

    HINT:

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

    1. NEXT: Go to next step. 
  5. CLEAR DTC AND FREEZE FRAME DATA (See  DTC CHECK/CLEAR   ) 
    1. NEXT: Go to next step. 
  6. VISUAL INSPECTION 
    1. NEXT: Go to next step. 
  7. SETTING CHECK (TEST) MODE DIAGNOSIS (See  CHECK MODE PROCEDURE   ) 
    1. NEXT: Go to next step. 
  8. PROBLEM SYMPTOM CONFIRMATION 

    HINT:

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

    Result: 

    PROBLEM SYMPTOM CONFIRMATION

    Result Proceed to
    Malfunction does not occur A
    Malfunction occurs B
    1. B: Go to step   10 . 
    2. A: Go to next step. 
  9. SYMPTOM SIMULATION 
    1. NEXT: Go to next step. 
  10. DTC CHECK (See  DTC CHECK/CLEAR   ) 

    Result: 

    RESULT DESCRIPTION

    Result Proceed to
    Malfunctioning code A
    No code B
    1. B: Go to step   12 . 
    2. A: Go to next step. 
  11. See  DIAGNOSTIC TROUBLE CODE TABLE  
    1. NEXT: Go to step   14 . 
  12. See  BASIC INSPECTION  

    Result: 

    RESULT DESCRIPTION

    Result Proceed to
    Malfunctioning parts not confirmed A
    Malfunctioning parts confirmed B
    1. B: Go to step   17 . 
    2. A: Go to next step. 
  13. See  PROBLEM SYMPTOMS TABLE  

    Result: 

    RESULT DESCRIPTION

    Result Proceed to
    Malfunctioning circuit confirmed A
    Malfunctioning parts confirmed B
    1. B: Go to step   17 . 
    2. A: Go to next step. 
  14. CHECK ECM POWER SOURCE CIRCUIT (See  ECM POWER SOURCE CIRCUIT   ) 
    1. NEXT: Go to next step. 
  15. CIRCUIT INSPECTION 

    Result: 

    RESULT DESCRIPTION

    Result Proceed to
    Malfunction not confirmed A
    Malfunction confirmed B
    1. B: Go to step   18 . 
    2. A: Go to next step. 
  16. See  CHECK FOR INTERMITTENT PROBLEMS  
    1. NEXT: Go to step   18 . 
  17. PARTS INSPECTION 
    1. NEXT: Go to next step. 
  18. IDENTIFICATION OF PROBLEM 
    1. NEXT: Go to next step. 
  19. ADJUSTMENT, REPAIR 
    1. NEXT: Go to next step. 
  20. CONFIRMATION TEST 
    1. NEXT: 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.