ECD SYSTEM (w/o DPF) MIL Circuit

DESCRIPTION

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

By turning the ignition switch to 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. If the MIL remains illuminated or is not illuminated, conduct the following troubleshooting procedure using the intelligent tester.

WIRING DIAGRAM

A01BCRJE03

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK THAT MIL IS ILLUMINATED


    1. Perform troubleshooting in accordance with the chart below.

      Result
      Result 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 to ON and turn the tester on.

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

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

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

    6. Clear the DTCs Click here.

    7. Check if the MIL turns off.

      OK
      MIL should turn off.

    NG

    CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT IN WIRE HARNESS) Click here

    OK

    REPAIR CIRCUITS INDICATED BY OUTPUT DTCS

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


    1. Disconnect the B48 ECM connector.

    2. Turn the ignition switch to ON.

    3. Check that MIL is not illuminated.

      OK
      MIL is not illuminated.

    4. Reconnect the ECM connector.


    NG

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

    OK

    REPLACE ECM

  4. CHECK THAT MIL IS ILLUMINATED


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

      OK
      MIL should be illuminated.

    NG

    CHECK THAT ENGINE STARTS Click here

    OK

    SYSTEM OK

  5. CHECK THAT ENGINE STARTS


    1. Turn the ignition switch to 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

    A

  6. 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

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