2007 Lexus IS 350FACTORY 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 the intelligent tester.
  1. VEHICLE BROUGHT TO WORKSHOP 

    NEXT 

  2. CUSTOMER PROBLEM ANALYSIS 

    NEXT 

  3. INSPECT BATTERY VOLTAGE 

    Standard voltage: 11 to 14 V 

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

    NEXT 

  4. CONNECT INTELLIGENT TESTER TO DLC3* 

    NEXT 

  5. CHECK AND CLEAR DTCS AND FREEZE FRAME DATA* 
    1. Refer to the DTC CHECK / CLEAR  .

    NEXT 

  6. VISUAL INSPECTION 

    NEXT 

  7. SETTING CHECK MODE DIAGNOSIS* 
    1. Refer to the CHECK MODE PROCEDURE  .

    NEXT 

  8. PROBLEM SYMPTOM CONFIRMATION 
    1. Refer to the ROAD TEST  .

      Result 

      PROBLEM SYMPTOM 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 .

    NEXT 

  10. DTC CHECK* 
    1. Refer to the DTC CHECK / CLEAR  .

      Result 

      DTC RESULT REFERENCE

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

    B: GO TO STEP  18

    A: Go to next step. 

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

    NG: GO TO STEP  21

    OK: Go to next step. 

  12. MECHANICAL SYSTEM TEST 
    1. Refer to the MECHANICAL SYSTEM TEST  .

    NG: GO TO STEP  17

    OK: Go to next step. 

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

    NG: GO TO STEP  17

    OK: Go to next step. 

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

    NG: GO TO STEP  16

    OK: Go to next step. 

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

    NG: GO TO STEP  19

    OK: Go to next step. 

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

    NEXT 

  17. PART INSPECTION 

    NEXT: GO TO STEP  21

  18. DTC CHART 
    1. Refer to the DIAGNOSTIC TROUBLE CODE CHART  .

    NEXT 

  19. CIRCUIT INSPECTION 

    NEXT 

  20. IDENTIFICATION OF PROBLEM 

    NEXT 

  21. REPAIR OR REPLACE 

    NEXT 

  22. 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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