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ECD SYSTEM (w/ DPF) MIL Circuit

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DTC Code DTC Name
  MIL Circuit
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DESCRIPTION

The MIL (Malfunction Indicator Lamp) is used to indicate vehicle malfunctions detected by the ECM. When the engine switch is turned on (IG), 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 engine switch is first turned on (IG), 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 the GTS.

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WIRING DIAGRAM

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INSPECTION PROCEDURE

Note:

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

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

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PROCEDURE


  1. Click here

    CHECK THAT MIL IS ILLUMINATED


    1. Perform troubleshooting in accordance with the table below.

      Table 1. Result
      Condition Proceed to
      MIL remains on A
      MIL does not illuminate B

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    CHECK WHETHER MIL TURNS OFF


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG) and turn the GTS on.

    3. Check if DTCs have been stored (Click here). If DTCs are present, write them down.

    4. Clear DTCs (Click here).

    5. Check that the MIL turns off.

      Standard
      MIL turns off.

  3. Click here

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


    1. Disconnect the ECM connector.

    2. Turn the engine switch on (IG).

    3. Check that the MIL is not illuminated.

      OK
      MIL is not illuminated.

    4. Reconnect the ECM connector.


  4. Click here

    CHECK HARNESS AND CONNECTOR (COMBINATION METER - ECM)


    1. Disconnect the ECM connector.

    2. Disconnect the combination meter connector.

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

      Standard Resistance
      Table 2. for LHD
      Tester Connection Condition Specified Condition
      E8-12 (CHK) - A38-24 (W) Always Below 1 Ω
      E8-12 (CHK) or A38-24 (W) - Body ground Always 10 kΩ or higher
      Table 3. for RHD
      Tester Connection Condition Specified Condition
      E8-12 (CHK) - A52-24 (W) Always Below 1 Ω
      E8-12 (CHK) or A52-24 (W) - Body ground Always 10 kΩ or higher

    4. Reconnect the ECM connector.

    5. Reconnect the combination meter connector.


  5. Click here

    CHECK THAT MIL IS ILLUMINATED


    1. Check if the MIL is illuminated when the engine switch is turned on (IG).

      OK
      MIL is illuminated.

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    CHECK THAT ENGINE STARTS


    1. Turn the engine switch on (IG).

    2. Start the engine.

      Table 4. Result
      Result Proceed to
      Engine starts A
      Engine does not start* B
      Tip:

      *: The GTS cannot communicate with the ECM.


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    INSPECT COMBINATION METER ASSEMBLY (MIL CIRCUIT)


    1. See the combination meter troubleshooting procedure (Click here).


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    REPAIR CIRCUITS INDICATED BY OUTPUT DTCS

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    REPLACE ECM

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    REPAIR OR REPLACE HARNESS OR CONNECTOR

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    SYSTEM OK

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    GO TO VC OUTPUT CIRCUITClick here

  13. Click here

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

  14. Click here

    REPLACE COMBINATION METER ASSEMBLYClick here