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MIL Circuit [12/2023 - ]: Procedure

WARNING: This page is about a different car, the 2024 Lexus TX 550h+. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK THAT MIL IS ILLUMINATED 
    1. Perform troubleshooting in accordance with the table below.

      Result

      MIL Condition Proceed to
      Illuminates → Turns off Ignition switch ON → Ignition switch on (READY) A
      Other than above - B

    Result: 

    CHECK FOR INTERMITTENT PROBLEMS. Refer to  CHECK FOR INTERMITTENT PROBLEMS [12/2023 - ] 

    Result: 

    See step  2

  2. CHECK COMMUNICATION BETWEEN GTS AND ECM 
    1. Check the communication between the GTS and ECM.

      HINT: 

      Communication can be checked by using the Data List item Engine.

      Result

      Result Proceed to
      Communication is possible A
      Communication is not possible B

    Result: 

    GO TO VC OUTPUT CIRCUIT. Refer to  VC Output Circuit [12/2023 - ]  

    Result: 

    See step  3

  3. CHECK WHETHER DTC OUTPUT RECURS 
    1. Perform the Health Check using the GTS.
    2. Check if any DTCs have been detected. Note down any DTCs.

      Result

      Result Proceed to
      DTCs are not output A
      DTCs are output B

      HINT: 

      Check for detected DTCs output from other ECUs which relate to the MIL.

    Result: 

    REPAIR CIRCUIT INDICATED BY OUTPUT 

    Result: 

    See step  4

  4. PERFORM ACTIVE TEST USING GTS 
    1. Check the status of the MIL while performing the Active Test.

      Body Electrical > Combination Meter > Active Test 

      Tester Display
      Multi Display All (White)

      Result

      Result Proceed to
      Changes A
      Does not change B

    Result: 

    REPLACE ECM. Refer to  REMOVAL [12/2023 - ] 

    Result: 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [09/2023 - ]