2006 Lexus GX 470FACTORY OEM SERVICE PROCEDURE

How To Proceed With Troubleshooting

HINT:

The hand-held tester can be used at step  3,  4,  5,  7,  10 and  15.

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

    HINT:

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

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

    HINT:

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

    MALFUNCTION REFERENCE

    A Malfunction does not occur
    B Malfunction occurs
    1. B: GO TO STEP   10 . 
    2. A: Go to next step. 
  9. SYMPTOM SIMULATION 
    1. Go to next step.
  10. DTC CHECK (See  DTC CHECK/CLEAR  ) 
    MALFUNCTION REFERENCE

    A Malfunction code
    B No code
    1. B: Go to step   12 . 
    2. A: Go to next step. 
  11. DTC CHART (See  DIAGNOSTIC TROUBLE CODE CHART  ) 
    1. GO TO STEP   14 . 
  12. BASIC INSPECTION (See  BASIC INSPECTION  ) 
    MALFUNCTION REFERENCE

    A Wrong parts not confirmed
    B Wrong parts confirmed
    1. B: GO TO STEP   17 . 
    2. A: Go to next step. 
  13. PROBLEM SYMPTOMS TABLE (See  PROBLEM SYMPTOMS TABLE  ) 
    MALFUNCTION REFERENCE

    A Wrong circuit confirmed
    B Wrong parts confirmed
    1. B: Go to step   17 . 
    2. A: Go to next step. 
  14. CHECK ECM POWER SOURCE CIRCUIT (See  ECM POWER SOURCE CIRCUIT   ) 
    1. Go to next step.
  15. CIRCUIT INSPECTION 
    MALFUNCTION REFERENCE

    A Malfunction not confirmed
    B Malfunction confirmed
    1. B: GO TO STEP   18 . 
    2. A: Go to next step. 
  16. CHECK FOR INTERMITTENT PROBLEMS (See  CHECK FOR INTERMITTENT PROBLEMS  ) 
    1. GO TO STEP   18 . 
  17. PARTS INSPECTION 
    1. Go to next step.
  18. IDENTIFICATION OF PROBLEM 
    1. Go to next step.
  19. ADJUSTMENT AND/OR REPAIR 
    1. Go to next step.
  20. CONFIRMATION TEST 
    1. 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.