SFI SYSTEM (w/o Secondary Air Injection System) MIL Circuit

DESCRIPTION

The MIL is used to inform the user when the ECM has detected a vehicle malfunction.

By turning the ignition switch ON, power is supplied to the MIL circuit, and the ECM provides the circuit ground that illuminates the MIL.

Operation of the MIL should be checked visually:

When the ignition switch is first turned ON, the MIL should illuminate. When the engine is started, the MIL should turn off.

WIRING DIAGRAM

A01J4A8E02

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK THAT MIL IS ILLUMINATED


    1. Perform troubleshooting in accordance with the chart below.

      Result
      Condition Proceed to
      MIL remains ON A
      MIL does not illuminate B

    B

    CHECK IF MIL ILLUMINATES Click here

    A

  2. CHECK IF MIL TURNS OFF


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch ON and turn the intelligent tester ON.

    3. Check if DTCs have been stored Click here. If DTCs are present, write them down.

    4. Clear the DTCs using the intelligent tester Click here.

    5. Check that the MIL turns off.

      OK
      The MIL turns off.

    OK

    REPAIR CIRCUIT INDICATED BY OUTPUT DTC

    NG

  3. CHECK WIRE HARNESS (FOR SHORT)

    A01J3VLE11

    1. Disconnect the E9 ECM connector.

    2. Turn the ignition switch ON.

    3. Check that the MIL is not illuminated.

      OK
      The MIL is not illuminated.

    OK

    REPLACE ECM

    NG

  4. CHECK WIRE HARNESS (ECM - COMBINATION METER)

    A01J7EZE10

    1. Disconnect the E9 ECM connector.

    2. Disconnect the C27 combination meter connector.

    3. Measure the resistance of the wire harness side connectors.

      Standard resistance
      Tester Connection Specified Condition
      E9-30 (W) - C27-39 Below 1 Ω
      E9-30 (W) or C27-39 - Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

    REPLACE COMBINATION METER ASSEMBLY

  5. CHECK IF MIL ILLUMINATES


    1. Check that the MIL illuminates when turning the ignition switch ON.

      OK
      The MIL illuminates.

    OK

    NORMAL

    NG

  6. CHECK THAT ENGINE STARTS


    1. Turn the ignition switch ON.

    2. Start the engine.

      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

    A

  7. INSPECT COMBINATION METER ASSEMBLY (MIL CIRCUIT)


    1. See the combination meter troubleshooting procedure Click here.


    NG

    REPAIR OR REPLACE BULB OR COMBINATION METER ASSEMBLY

    OK

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