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ECD SYSTEM MIL Circuit

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DTC Code DTC Name
  MIL Circuit
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DESCRIPTION

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

By turning the ignition switch to 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 to ON, the MIL should illuminate. When the engine is started, the MIL should turn off.

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WIRING DIAGRAM

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INSPECTION PROCEDURE

Note:

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

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PROCEDURE


  1. Click here

    CHECK MIL CONDITION


    1. Check the MIL condition.

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

  2. Click here

    CHECK IF MIL TURNS OFF


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON and turn the tester on.

    3. Check if DTCs have been stored (Click here). If DTCs are stored, 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.

  3. Click here

    CHECK HARNESS AND CONNECTOR (FOR SHORT)


    1. Disconnect the ECM connector.

    2. Turn the ignition switch to ON.

    3. Check that the MIL is not illuminated.

      OK
      The MIL is not illuminated.
      Table 1. Text in Illustration
      *a

      Rear view of wire harness connector

      (to ECM)

    4. Reconnect the ECM connector.


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    CHECK HARNESS AND CONNECTOR (ECM - COMBINATION METER ASSEMBLY)


    1. Disconnect the ECM connector.

    2. Disconnect the combination meter assembly connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      G61-5 (W) - G7-7 (CHK) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      G61-5 (W) or G7-7 (CHK) - Body ground Always 10 kΩ or higher

    4. Reconnect the ECM connector.

    5. Reconnect the combination meter assembly connector.


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    CHECK IF MIL ILLUMINATES


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

      OK
      The MIL illuminates.

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    INSPECT COMBINATION METER ASSEMBLY (MIL CIRCUIT)


    1. Refer to the combination meter assembly troubleshooting procedures (Click here).


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    NORMAL

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    REPAIR OR REPLACE COMBINATION METER ASSEMBLYClick here

  9. Click here

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

  10. Click here

    REPAIR CIRCUIT INDICATED BY OUTPUT DTCClick here

  11. Click here

    REPLACE ECMClick here

  12. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  13. Click here

    REPLACE COMBINATION METER ASSEMBLYClick here