SFI SYSTEM(w/o EGR System) MIL Circuit

DTC Code DTC Name
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 intelligent tester.

WIRING DIAGRAM

A279706E02

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

    CHECK THAT MIL IS ILLUMINATEDClick here

    A

  2. CHECK WHETHER MIL TURNS OFF

    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the tester on.

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

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

      Powertrain > Engine and ECT > Trouble Codes

    6. Clear DTCs

      Click here

      Powertrain > Engine and ECT > Clear DTCs

    7. Check if the MIL goes off.

      OK

      MIL goes off.

      Result

      Result

      OK

      NG
    OK

    REPAIR CIRCUITS INDICATED BY OUTPUT DTCS

    Click here

    NG

  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.

      Result

      Disconnect the ECM connector

      Result

      OK

      NG
    OK

    REPLACE ECM

    Click here

    NG

  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

      G44-13 (W) or G3-31 (CHK) - Body ground

      Always

      10 kΩ or higher

      Result

      Result

      OK

      NG
    OK

    REPLACE COMBINATION METER ASSEMBLY

    Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  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.

      Result

      Result

      OK

      NG
    OK

    END

    NG

  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
      Tip:

      *: The intelligent tester cannot communicate with the ECM.

    B

    GO TO VC OUTPUT CIRCUIT

    Click here

    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

      G44-13 (W) - G3-31 (CHK)

      Always

      Below 1 Ω

      Result

      Result

      OK

      NG
    OK

    REPLACE COMBINATION METER ASSEMBLY

    Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR