2008 Lexus GX 470FACTORY OEM SERVICE PROCEDURE

How To Proceed With Troubleshooting

HINT:

  • The ECM of this system is connected to the CAN and multiplex communication system. Therefore, before starting troubleshooting, make sure to check that there is no trouble in the CAN and multiplex communication systems.
  • *: Use Techstream.
  1. VEHICLE BROUGHT TO WORKSHOP 
  2. CUSTOMER PROBLEM ANALYSIS 
  3. INSPECT BATTERY VOLTAGE 

    Standard voltage: 11 to 14 V 

    If the voltage is below 11 V, recharge or replace the battery before proceeding.

  4. CONNECT TECHSTREAM TO DLC3* 
  5. CHECK AND CLEAR DTCS AND FREEZE FRAME DATA* 
    1. Refer to the DTC CHECK/CLEAR  (See .
  6. VISUAL INSPECTION 
  7. SETTING CHECK MODE DIAGNOSIS* 
    1. Refer to the CHECK MODE PROCEDURE  (See .
  8. PROBLEM SYMPTOM CONFIRMATION 
    1. Refer to the ROAD TEST  (See .

      Result 

      RESULT REFERENCE

      Result Proceed to
      Symptom does not occur A
      Symptom occurs B

    B: GO TO STEP  10

    A: Go to Next Step 

  9. SYMPTOM SIMULATION 
    1. Refer to the ELECTRONIC CIRCUIT INSPECTION PROCEDURE (see ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).
  10. DTC CHECK* 
    1. Refer to the DTC CHECK/CLEAR  (See

      Result 

      RESULT REFERENCE

      Result Proceed to
      DTC is not output A
      DTC is output B

    B: GO TO STEP  19

    A: Go to Next Step 

  11. BASIC INSPECTION 
    1. Refer to the AUTOMATIC TRANSMISSION FLUID  (See .
    2. Refer to the PARK/NEUTRAL POSITION SWITCH  (See .
    3. Refer to the SHIFT LEVER ASSEMBLY  (See

    NG: GO TO STEP  22

    OK: Go to Next Step 

  12. MECHANICAL SYSTEM TESTS 
    1. Refer to the MECHANICAL SYSTEM TESTS  (See .

    NG: GO TO STEP  18

    OK: Go to Next Step 

  13. HYDRAULIC TEST 
    1. Refer to the HYDRAULIC TEST  (See .

    NG: GO TO STEP  18

    OK: Go to Next Step 

  14. MANUAL SHIFTING TEST 
    1. Refer to the MANUAL SHIFTING TEST  (See .

    NG: GO TO STEP  17

    OK: Go to Next Step 

  15. PROBLEM SYMPTOMS TABLE CHAPTER 1 
    1. Refer to the PROBLEM SYMPTOMS TABLE  (See .

    NG: GO TO STEP  20

    OK: Go to Next Step 

  16. PROBLEM SYMPTOMS TABLE CHAPTER 2 
    1. Refer to the PROBLEM SYMPTOMS TABLE  (See .

    NG: GO TO STEP  18

    OK: Go to Next Step 

  17. PROBLEM SYMPTOMS TABLE CHAPTER 3 
    1. Refer to the PROBLEM SYMPTOMS TABLE  (See
  18. PART INSPECTION 

    NEXT: GO TO STEP  22

  19. DTC CHART 
    1. Refer to the DIAGNOSTIC TROUBLE CODE CHART  (See .
  20. CIRCUIT INSPECTION 
  21. IDENTIFICATION OF PROBLEM 
  22. REPAIR OR REPLACE 
  23. 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.