ECD SYSTEM (w/ EGR Cooler) MIL Circuit

DESCRIPTION

The MIL (Malfunction Indicator Lamp) is used to indicate vehicle malfunction detections by the ECM.

By turning the ignition switch ON, 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, 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 an intelligent tester.

WIRING DIAGRAM

A01DVEME11

INSPECTION PROCEDURE

Note

After replacing the ECM, the new ECM needs registration Click here and initialization Click here.

PROCEDURE


  1. CHECK THAT MIL IS ILLUMINATED


    1. Perform troubleshooting in accordance with the chart below.

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

    B

    CHECK THAT MIL IS ILLUMINATED Click here

    A

  2. CHECK WHETHER MIL TURNS OFF


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch ON.

    3. Turn the tester ON.

    4. Check whether any DTCs have been stored Click here. Note them down if necessary.

    5. Clear DTCs Click here.

    6. Check if the MIL turns off.

      OK
      MIL should turn off.

    OK

    REPAIR CIRCUITS INDICATED BY OUTPUT DTCS Click here

    NG

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

    A01DWTOE58

    1. Disconnect the E5 ECM connector.

    2. Turn the ignition switch ON.

    3. Check that MIL is not illuminated.

      OK
      MIL is not illuminated.

    4. Reconnect the ECM connector.


    OK

    REPLACE ECM

    NG

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

  4. CHECK THAT MIL IS ILLUMINATED


    1. Check if the MIL is illuminated when the ignition switch is turns ON.

      OK
      MIL should be illuminated.

    OK

    SYSTEM OK

    NG

  5. CHECK THAT ENGINE STARTS


    1. Turn the ignition switch ON.

    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. INSPECT COMBINATION METER ASSEMBLY (MIL CIRCUIT)

    Click here


    1. See the combination meter troubleshooting procedure.


    NG

    REPAIR OR REPLACE COMBINATION METER ASSEMBLY Click here

    OK

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