SFI SYSTEM MIL Circuit

DESCRIPTION

The Malfunction Indicator Lamp (MIL) is used to indicate vehicle malfunctions detected by the ECM. When the engine switch on (IG), power is supplied to the MIL circuit, and the ECM provides the circuit ground which illuminates the MIL.

The MIL operation can be checked visually. When the engine switch is turned on (IG), the MIL should be illuminated and should then turn off after engine is started. If the MIL remains illuminated or is not illuminated, conduct the following troubleshooting procedure using the GTS.

WIRING DIAGRAM

B008I1TE32
*1 Combination Meter Assembly
*2 CAN Communication Line

CAUTION / NOTICE / HINT

Note

Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE


  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

    A

    CHECK FOR INTERMITTENT PROBLEMS Click here

    B

    GO TO VC OUTPUT CIRCUIT Click here

    C

  2. CHECK WHETHER DTC OUTPUT RECURS


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.


      Powertrain > Engine and ECT > Trouble Codes

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

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

      Tech Tips

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


    B

    REPAIR CIRCUIT INDICATED BY OUTPUT

    A

  3. PERFORM ACTIVE TEST USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Enter the following menus: Body Electrical / Combination Meter / Active Test / Check Engine Indicator


      Body Electrical > Combination Meter > Active Test
      Tester Display
      Check Engine Indicator

    4. Check the status of the MIL while performing the Active Test.

      Result
      Result Proceed to
      Changes A
      Does not change B

    A

    REPLACE ECM Click here

    B

    REPLACE COMBINATION METER ASSEMBLY Click here