SFI SYSTEM MIL Circuit

DESCRIPTION

The Malfunction Indicator Lamp (MIL) is used to indicate vehicle malfunctions detected by the ECM. By turning 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 first 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. If the ECM detects any trouble, the MIL illuminates. At this time, the ECM records a DTC in the memory.

WIRING DIAGRAM

A01FDRXE01

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK THAT MIL ILLUMINATES


    1. Turn the engine switch on (IG).

    2. Check the illumination of the MIL.

      Result
      Result Proceed to
      MIL remains illuminated (Even after engine switch is turned to on (IG) and several seconds have passed, MIL still remains illuminated) A
      MIL remains off (Does not illuminate at all) B
      MIL illuminates for several seconds, but turns off after engine is started C

    B
    C
    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 any DTCs.

    6. Clear the DTCs Click here.

    7. Check if the MIL goes off.

      Result
      Result Proceed to
      MIL goes off A
      MIL does not go off B

    B
    A
  3. CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT IN WIRE HARNESS)


    1. A01FGX1E08
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to ECM)

      Disconnect the ECM connector.

    2. Turn the engine switch on (IG).

    3. Check if the MIL is illuminated.

      Result
      Result Proceed to
      MIL is not illuminated A
      MIL is illuminated B
    4. Reconnect the ECM connector.


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


    1. Disconnect the combination meter assembly connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      N40-5 (CHK) or A19-11 (W) - Body ground Always 10 kΩ or higher
    4. Reconnect the combination meter assembly connector.

    5. Reconnect the ECM connector.


    NG
    OK
  5. CHECK IF ENGINE STARTS


    1. 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
  6. CHECK HARNESS AND CONNECTOR (ECM TERMINAL VOLTAGE)


    1. A01FGX1E09
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to ECM)

      Disconnect the ECM connector.

    2. Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A19-11 (W) - Body ground Engine switch on (IG) 11 to 14 V
    4. Reconnect the ECM connector.


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


    1. Disconnect the combination meter assembly connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      N40-5 (CHK) - A19-11 (W) Always Below 1 Ω
    4. Reconnect the ECM connector.

    5. Reconnect the combination meter assembly connector.


    NG
    OK