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. If the MIL remains illuminated or is not illuminated, conduct the following troubleshooting procedure using an intelligent tester.

WIRING DIAGRAM

A01DZJXE05

INSPECTION PROCEDURE

Note

If the ECM is replaced, 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. Note them down if necessary.

    5. Clear DTCs Click here.

    6. Check if the MIL turns off.

      OK
      MIL should turn off.

    OK

    DTC CHART

    NG

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


    1. A01DWTOE54

      Disconnect the E5 ECM connector.

    2. Turn the ignition switch ON.

    3. Check that MIL is not illuminated.

      OK
      MIL does not illuminate.

    4. Reconnect the ECM connector.


    NG

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

    OK

    REPLACE ECM

  4. CHECK THAT MIL IS ILLUMINATED


    1. Check if the MIL 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

      *: An intelligent tester cannot communicate with the ECM.


    B

    GO TO VC OUTPUT CIRCUIT

    A

  6. CHECK HARNESS AND CONNECTOR (COMBINATION METER - ECM)


    1. A01E1DME02

      Disconnect the C25 combination meter connector.

    2. Disconnect the E5 ECM connector.

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

      Standard resistance (Check for open)
      Tester Connection Specified Condition
      C25-39 - W (E5-12) Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Specified Condition
      C25-39 or W (E5-12) - Body ground 10 kΩ or higher

    NG

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

    OK

    REPLACE COMBINATION METER ASSEMBLY