2007 Lexus RX 350 FWDFACTORY OEM SERVICE PROCEDURE

How To Proceed With Troubleshooting

HINT:

The intelligent tester can be used in steps  2,  3,  4,  6 and  9.

  1. VEHICLE BROUGHT TO WORKSHOP 
  2. CONNECT INTELLIGENT TESTER TO DLC3 

    HINT:

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

  3. CHECK DTC AND FREEZE FRAME DATA 
    1. Check for DTC(s) and freeze frame data (See FREEZE FRAME DATA  ).

      HINT:

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

  4. CLEAR DTC AND FREEZE FRAME DATA 
    1. Clear the DTC(s) and freeze frame data (See FREEZE FRAME DATA  ).
  5. CONDUCT VISUAL INSPECTION 
  6. SET CHECK MODE DIAGNOSIS 
    1. Set the check mode (See CHECK MODE PROCEDURE  ).
  7. CONFIRM PROBLEM SYMPTOMS 

    HINT:

    If the engine does not start, perform steps  9 and  11 first.

    Result 

    RESULT CHART

    Result Proceed to
    Malfunction does not occur A
    Malfunction occurs B

    B: GO TO STEP  9

    A: Go to Next Step 

  8. SIMULATE SYMPTOMS 
  9. CHECK FOR DTCS 
    1. Check for DTCs (See DTC CHECK/CLEAR  ).

      Result 

      RESULT CHART

      Result Proceed to
      Trouble code A
      No code B

    B: GO TO STEP  11

    A: Go to Next Step 

  10. REFER TO "DTC CHART"

    HINT:

    Refer to the DTC chart (See DIAGNOSTIC TROUBLE CODE CHART  ).

    GO TO STEP  13

  11. CONDUCT BASIC INSPECTION 

    HINT:

    Refer to "BASIC INSPECTION "

    Result 

    RESULT CHART

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

    B: GO TO STEP  16

    A: Go to Next Step 

  12. REFER TO "PROBLEM SYMPTOMS TABLE"

    HINT:

    Refer to "PROBLEM SYMPTOMS TABLE "

    Result 

    RESULT CHART

    Result Proceed to
    Malfunctioning circuit confirmed A
    Malfunctioning parts confirmed B

    B: GO TO STEP  16

    A: Go to Next Step 

  13. CHECK ECM POWER SOURCE CIRCUIT 

    HINT:

    Refer to "ECM POWER SOURCE CIRCUIT "

  14. CONDUCT CIRCUIT INSPECTION 

    Result 

    RESULT CHART

    Result Proceed to
    Malfunction not confirmed A
    Malfunction confirmed B

    B: GO TO STEP  17

    A: Go to Next Step 

  15. CHECK FOR INTERMITTENT PROBLEMS 

    HINT:

    Refer to "CHECK FOR INTERMITTENT PROBLEMS "

    GO TO STEP  17

  16. CONDUCT PARTS INSPECTION 
  17. IDENTIFY PROBLEM 
  18. ADJUST AND/OR REPAIR 
  19. CONDUCT CONFIRMATION TEST 

    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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