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MIL Circuit [04/2013 - 08/2015]: Procedure

WARNING: This page is about a different car, the 2015 Lexus IS 250 and 2014 Lexus IS 250. 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

      Result Condition Proceed to
      ON→OFF Engine switch on (IG) → engine is started A
      MIL does not illuminate Engine switch on (IG) → engine is started B
      MIL remains ON Engine switch on (IG) → engine is started C

    Result: 

    CHECK FOR INTERMITTENT PROBLEMS. Refer to  CHECK FOR INTERMITTENT PROBLEMS [04/2013 - 08/2015] 

    Result: 

    GO TO VC OUTPUT CIRCUIT. Refer to  VC Output Circuit [04/2013 - 08/2015]  

    Result: 

    See step  2

  2. CHECK WHETHER DTC OUTPUT RECURS 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

      Powertrain > Engine > Trouble Codes 

    5. Check if any DTCs have been detected. Note down any DTCs.

      Result

      Result Proceed to
      DTCs are not output A
      Any DTCs is 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  3

  3. PERFORM ACTIVE TEST USING TECHSTREAM 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / Combination Meter / Active Test / Check Engine Indicator

      Body Electrical > Combination Meter > Active Test 

      Tester Display
      Check Engine Indicator
    5. Check the status of the MIL while performing the Active Test.

      Result

      Result Proceed to
      Changes A
      Does not change B

    Result: 

    REPLACE ECM. Refer to  REMOVAL [04/2013 - 08/2015] 

    Result: 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [04/2013 - 10/2016]