SFI SYSTEM MIL Circuit

DTC Code DTC Name
MIL Circuit

DESCRIPTION

The MIL (Malfunction Indicator Lamp) is used to indicate vehicle malfunctions detected by the ECM. When the ignition switch is turned 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 turned to ON, the MIL should be illuminated and should turn off after engine is started. If the MIL remains illuminated or is not illuminated, conduct the following troubleshooting procedure using the GTS.

WIRING DIAGRAM

A331046E01

CAUTION / NOTICE / HINT

Note:

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

PROCEDURE

  1. CHECK THAT MIL IS ILLUMINATED

    1. Perform troubleshooting in accordance with the table below.

    Result

    Result

    Proceed to

    MIL remains on

    A

    MIL does not illuminate

    B
    B

    CHECK THAT MIL IS ILLUMINATEDClick here

    A

  2. CHECK WHETHER DTC OUTPUT RECURS

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine / Trouble Codes.

      Powertrain > Engine > Trouble Codes

    5. Check if any DTCs have been detected. Note down any DTCs.

      Result

      Result

      Proceed to

      No DTC detected

      A

      Any DTCs detected

      B
      Tip:

      Check for detected DTCs output from other ECUs which relate to the MIL.

    B

    REPAIR CIRCUITS INDICATED BY OUTPUT DTCS

    A

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

    1. Disconnect the A35 ECM connector.

    2. Turn the ignition switch to ON.

    3. Check that the MIL is not illuminated.

      OK

      MIL is not illuminated.

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE ECM

    Click here

    NG

  4. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - ECM)

    1. Disconnect the combination meter assembly connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      E12-23 or A35-10 (W) - Body ground and other terminals

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE COMBINATION METER ASSEMBLY

    Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  5. 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.

    Result

    Proceed to

    OK

    NG
    OK

    CHECK FOR INTERMITTENT PROBLEMS

    Click here

    NG

  6. 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
      Tip:

      *: The GTS cannot communicate with the ECM.

    B

    GO TO VC OUTPUT CIRCUIT

    Click here

    A

  7. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - ECM)

    1. Disconnect the combination meter assembly connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      E12-23 - A35-10 (W)

      Always

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE COMBINATION METER ASSEMBLY

    Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR