SFI SYSTEM MIL Circuit

DESCRIPTION

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

WIRING DIAGRAM


A01XGARE12
*1 GAUGE
*2 from IG2 relay
*3 Combination Meter

A01XGARE13
*1 GAUGE
*2 from IG2 relay
*3 Combination Meter

PROCEDURE


  1. CHECK THAT MIL IS ILLUMINATED


    1. Check that the MIL is illuminated.

      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 GTS to the DLC3.

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

    3. Check for DTCs Click here. If DTCs are output, write them down.

    4. Clear the DTCs Click here.

    5. Check that the MIL turns off.

      OK
      MIL turns off.

    OK

    REPAIR CIRCUITS INDICATED BY OUTPUT DTCS Click here

    NG

  3. 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.


    OK

    REPLACE ECM Click here

    NG

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


    1. Disconnect the ECM connector.

    2. Disconnect the combination meter assembly connector.

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

      Standard Resistance (Check for Open)
      for Automatic Transmission
      Tester Connection Condition Specified Condition
      G7-7 (CHK) - G56-21 (W) Always Below 1 Ω
      for Manual Transmission
      Tester Connection Condition Specified Condition
      G7-7 (CHK) - G55-13 (W) Always Below 1 Ω
      Standard Resistance (Check for Short)
      for Automatic Transmission
      Tester Connection Condition Specified Condition
      G7-7 (CHK) or G56-21 (W) - Body ground Always 10 kΩ or higher
      for Manual Transmission
      Tester Connection Condition Specified Condition
      G7-7 (CHK) or G55-13 (W) - Body ground Always 10 kΩ or higher

    4. Reconnect the ECM connector.

    5. Reconnect the combination meter connector.


    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 engine switch is turned to on (IG).

      OK
      MIL is illuminated.

    OK

    SYSTEM OK

    NG

  6. CHECK THAT ENGINE STARTS


    1. Turn the engine switch on (IG).

    2. Start the engine.

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

      Tech Tips

      *: The GTS cannot communicate with the ECM.


    B

    GO TO VC OUTPUT CIRCUIT Click here

    A

  7. INSPECT COMBINATION METER ASSEMBLY (MIL CIRCUIT)


    1. Refer to the combination meter troubleshooting procedure Click here.


    OK

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

    NG

    REPLACE COMBINATION METER ASSEMBLY Click here