SFI SYSTEM MIL Circuit

DESCRIPTION

The MIL (Malfunction Indicator Lamp) is used to indicate the detection of vehicle malfunctions by the ECM. When the engine switch is turned 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 first turned on (IG), the MIL should be illuminated and should then turn off when the engine is started. If the MIL remains illuminated or is not illuminated, conduct the following troubleshooting procedure using the GTS.

WIRING DIAGRAM

A01EP6CE06

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK THAT MIL IS ILLUMINATED


    1. Perform troubleshooting in accordance with the table below.

      Result
      Result Proceed to
      MIL remains on A
      MIL does not illuminate B

    B
    A
  2. CHECK WHETHER MIL TURNS OFF


    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.

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

    6. Clear DTCs Click here.

    7. Check if the MIL goes off.

      OK
      MIL goes off.

    NG
    OK
  3. CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT IN WIRE HARNESS)


    1. Disconnect the ECM connector.

    2. Turn the engine switch on (IG).

    3. Check that the MIL is not illuminated.

      OK
      MIL is not illuminated.

    NG
    OK
  4. CHECK HARNESS AND CONNECTOR (COMBINATION METER - ECM)


    1. Disconnect the ECM connector.

    2. Disconnect the combination meter connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      A53-24 (W) or E77-18 (CHK) - Body ground Always 10 kΩ or higher

    NG
    OK
  5. CHECK THAT MIL IS ILLUMINATED


    1. Check if the MIL is illuminated when the engine switch is turned on (IG).

      OK
      MIL is illuminated.

    NG
    OK
  6. CHECK THAT ENGINE STARTS


    1. Turn the engine switch on (IG).

    2. Start the engine.

      Result
      Result Proceed to
      Engine starts A
      Engine does not start* B

      Tech Tips

      *: The GTS cannot communicate with the ECM.


    B
    A
  7. CHECK HARNESS AND CONNECTOR (COMBINATION METER - ECM)


    1. Disconnect the ECM connector.

    2. Disconnect the combination meter connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      A53-24 (W) - E77-18 (CHK) Always Below 1 Ω

    NG
    OK