SFI SYSTEM MIL Circuit

DESCRIPTION

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

WIRING DIAGRAM

A017ERNE02
A017DVPE04

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK THAT MIL IS ILLUMINATED


    1. Turn the ignition switch on (IG).

    2. Check the illumination of the MIL.

      Result
      Result Proceed to
      MIL remains illuminated (Even after ignition switch is turned on (IG) and several seconds have passed, MIL still remains illuminated) A
      MIL remains off (Does not illuminate at all) B

    B

    CHECK THAT ENGINE STARTS Click here

    A

  2. CHECK WHETHER MIL TURNS OFF


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch on (IG) and turn the tester on.

    3. Select the following menu items: Powertrain / Engine and ECT / Trouble Code.

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

    5. Clear the DTCs Click here.

    6. Check if the MIL goes off.

      Standard
      MIL goes off.

    NG

    CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT IN WIRE HARNESS) Click here

    OK

    REPAIR CIRCUITS INDICATED BY OUTPUT DTCS

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


    1. A017CFEE05

      Disconnect the ECM connector.

    2. Turn the ignition switch on (IG).

    3. Check that the MIL is not illuminated.

      OK
      MIL is not illuminated.

    4. Reconnect the ECM connector.


    NG

    CHECK HARNESS AND CONNECTOR (COMBINATION METER - ECM) Click here

    OK

    REPLACE ECM Click here

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


    1. A017E90E07

      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 (Check for Open)
      Tester Connection Condition Specified Condition
      D32-30 (W) - E1-10 Always Bellow 1 Ω
      Standard resistance (Check for Short)
      Tester Connection Condition Specified Condition
      D32-30 (W) or E1-10 - Body ground Always 10 kΩ or higher

    4. Reconnect the ECM connector.

    5. Reconnect the combination meter connector.


    NG

    CHECK HARNESS AND CONNECTOR (COMBINATION METER - ECM) Click here

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here

  5. CHECK THAT ENGINE STARTS


    1. Turn the ignition switch on (IG).

    2. Start the engine.

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

      Tech Tips

      *: The intelligent tester cannot communicate with the ECM.


    B

    GO TO VC OUTPUT CIRCUIT Click here

    A

  6. CHECK HARNESS AND CONNECTOR (COMBINATION METER - BODY GROUND)


    1. A017CFEE07

      Disconnect the ECM connector.

    2. Turn the ignition switch on (IG).

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

      Standard voltage
      Tester Connection Condition Specified Condition
      D32-30 (W) - Body ground Ignition switch on (IG) 11 to 14 V

    4. Reconnect the ECM connector.


    NG

    CHECK HARNESS AND CONNECTOR (COMBINATION METER - ECM) Click here

    OK

    REPLACE ECM Click here

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


    1. A017E90E07

      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 (Check for short)
      Tester Connection Condition Specified Condition
      D32-30 (W) - E1-10 Always Bellow 1 Ω
      Standard resistance (Check for Short)
      Tester Connection Condition Specified Condition
      D32-30 (W) or E1-10 - Body ground Always 10 kΩ or higher

    4. Reconnect the ECM connector.

    5. Reconnect the combination meter connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (COMBINATION METER - ECM)

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here