2006 Lexus IS 350FACTORY OEM SERVICE PROCEDURE

How To Proceed With Troubleshooting

HINT:

*: Use the intelligent tester.

  1. VEHICLE BROUGHT TO WORKSHOP 

    NEXT 

  2. CUSTOMER PROBLEM ANALYSIS 

    NEXT 

  3. CONNECT INTELLIGENT TESTER TO THE DLC3* 

    HINT:

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

    NEXT 

  4. CHECK DTC AND FREEZE FRAME DATA* 

    HINT:

    Record or print DTCs and freeze frame data, if necessary.

    NEXT 

  5. CLEAR DTC AND FREEZE FRAME DATA* 

    NEXT 

  6. CONDUCT VISUAL INSPECTION 

    NEXT 

  7. SET CHECK MODE DIAGNOSIS* 

    NEXT 

  8. CONFIRM PROBLEM SYMPTOMS 

    HINT:

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

    Result 

    RESULT REFERENCE

    Result Proceed to
    Malfunction does not occur A
    Malfunction occur B

    B : GO TO STEP   10 

    A : GO TO NEXT STEP 

  9. SIMULATE SYMPTOMS 

    NEXT 

  10. CHECK DTC* 

    Result 

    RESULT REFERENCE

    Result Proceed to
    Malfunction code A
    No code B

    B : GO TO STEP   12 

    A : GO TO NEXT STEP 

  11. REFER TO  DTC CHART  

    NEXT 

    GO TO STEP   14 

  12. CONDUCT BASIC INSPECTION 

    Result 

    RESULT REFERENCE

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

    B : GO TO STEP   17 

    A : GO TO NEXT STEP 

  13. REFER TO  PROBLEM SYMPTOMS TABLE  

    Result 

    RESULT REFERENCE

    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 

    NEXT 

  15. CONDUCT CIRCUIT INSPECTION 

    Result 

    RESULT REFERENCE

    Result Proceed to
    Malfunction not confirmed A
    Malfunction confirmed B

    B : GO TO STEP   18 

    A : GO TO NEXT STEP 

  16. CHECK FOR INTERMITTENT PROBLEMS 

    NEXT 

    GO TO STEP   18 

  17. CONDUCT PARTS INSPECTION 

    NEXT 

  18. IDENTIFY PROBLEM 

    NEXT 

  19. ADJUST AND/OR REPAIR 

    NEXT 

  20. CONDUCT CONFIRMATION TEST 

    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.

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