ECD 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 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.

WIRING DIAGRAM

A01DQDKE04

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. CHECK MIL CONDITION


    1. Check the MIL condition.

      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 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.

    NG

    CHECK HARNESS AND CONNECTOR (FOR SHORT) Click here

    OK

    REPAIR CIRCUIT INDICATED BY OUTPUT DTC Click here

  3. CHECK HARNESS AND CONNECTOR (FOR SHORT)

    A01DRQ3E07
    Text in Illustration
    *a

    Rear view of wire harness connector

    (to ECM)

    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.

    4. Reconnect the ECM connector.


    NG

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

    OK

    REPLACE ECM Click here

  4. 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.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here

  5. CHECK IF MIL ILLUMINATES


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

      OK
      The MIL illuminates.

    NG

    INSPECT COMBINATION METER ASSEMBLY (MIL CIRCUIT) Click here

    OK

    NORMAL

  6. INSPECT COMBINATION METER ASSEMBLY (MIL CIRCUIT)


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


    NG

    REPAIR OR REPLACE COMBINATION METER ASSEMBLY Click here

    OK

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