SFI SYSTEM MIL Circuit

DESCRIPTION

The MIL (Malfunction Indicator Lamp) is used to indicate vehicle malfunction detected by the ECM. When the power 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 power switch is turned on (IG), the MIL should illuminate and should then turn off after power switch is turned on (READY). If the MIL remains illuminated or is not illuminated, conduct the following troubleshooting procedure using the GTS.

WIRING DIAGRAM

A005DIXE01

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


  1. CHECK THAT MIL IS ILLUMINATED


    1. Turn the power switch on (IG).

    2. Check the illumination of the MIL.

      Result
      Condition Proceed to
      MIL remains illuminated A
      MIL remains off B
      MIL illuminates and should turn off after power switch is turned on (READY) C

    B

    CHECK THAT ENGINE STARTS Click here

    C

    CHECK FOR INTERMITTENT PROBLEMS Click here

    A

  2. CHECK WHETHER MIL TURNS OFF


    1. Connect the GTS to the DLC3.

    2. Turn the power 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 the DTCs.

    6. Clear the DTCs Click here.

    7. Check if the MIL goes off.

      OK
      MIL goes off.

    OK

    REPAIR CIRCUITS INDICATED BY OUTPUT DTCS Click here

    NG

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


    1. Disconnect the A57 ECM connector.

    2. Turn the power switch on (IG).

    3. Check that the MIL is not illuminated.

      OK
      MIL is not illuminated.

    OK

    REPLACE ECM Click here

    NG

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


    1. Disconnect the combination meter sub-assembly connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L27-6 (EFI) or A57-36 (W) - Body ground Always 10 kΩ or higher

    OK

    REPLACE METER CIRCUIT PLATE Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  5. CHECK THAT ENGINE STARTS


    1. Turn the power switch on (IG).

    2. Turn the GTS on.

    3. Put the engine in inspection mode (maintenance mode) Click here.

    4. Start the engine.

      Result
      Result Proceed to
      Engine starts A

      Engine cannot be put in inspection mode*

      (Engine cannot start)

      		 B

      Tech Tips

      *: The GTS cannot communicate with the ECM.


    B

    GO TO VC OUTPUT CIRCUIT Click here

    A

  6. CHECK HARNESS AND CONNECTOR (ECM TERMINAL VOLTAGE)


    1. Disconnect the ECM connector.

    2. Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A57-36 (W) - Body ground Power switch on (IG) 11 to 14 V

    OK

    REPLACE ECM Click here

    NG

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


    1. Disconnect the combination meter sub-assembly connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L27-6 (EFI) - A57-36 (W) Always Below 1 Ω

    OK

    REPLACE METER CIRCUIT PLATE Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR