SFI SYSTEM MIL Circuit

DESCRIPTION

The MIL (Malfunction Indicator Lamp) is used to indicate vehicle malfunctions detected by the ECM. When the power 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 power switch is turned on (IG), the MIL should be illuminated and should turn off after power switch on (READY). If the MIL remains illuminated or is not illuminated, conduct the following troubleshooting procedure using the Techstream.

WIRING DIAGRAM

A011YV8E02

INSPECTION PROCEDURE

Note

Inspect the fuses for circuits related to this system before performing the following inspection 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
    A
  2. CHECK WHETHER DTC OUTPUT RECURS

    1. Connect the Techstream to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the Techstream on.

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

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

      Result
      Result Proceed to
      DTC is not detected A
      Any DTCs are detected B

      Tech Tips

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

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

    1. Disconnect the A25 ECM connector.

      A011WD6E09
    2. Turn the power switch on (IG).

    3. Check that the MIL is not illuminated.

      OK
      MIL is not illuminated.
      Text in Illustration
      *a

      Front view of wire harness connector

      (to ECM)

    NG
    OK
  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
      A25-30 (W) or I18-22 (CHK) - Body ground Always 10 kΩ or higher
    NG
    OK
  5. CHECK THAT MIL IS ILLUMINATED

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

      OK
      MIL should be illuminated.
    NG
    OK
  6. CHECK THAT ENGINE STARTS

    1. Connect the Techstream to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the Techstream on.

    4. Put the engine in inspection mode (maintenance mode) Click here.

    5. Start the engine.

      Result
      Result Proceed to
      Engine starts A
      Engine does not start* B

      Tech Tips

      *: The Techstream cannot communicate with the ECM.

    B
    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
      A25-30 (W) - I18-22 (CHK) Always Below 1 Ω
    NG
    OK