СИСТЕМА SFI MIL Circuit

DESCRIPTION

The Malfunction Indicator Lamp (MIL) is used to indicate the ECM's detection of a vehicle malfunction.

The instrument panel GAUGE fuse provides the circuit with power and the ECM provides the circuit ground that illuminates the MIL.

MIL operations should be checked visually:

When the engine switch is first turned on (IG), the MIL should be illuminated and should then turn off after engine is started. If the MIL remains illuminated or is not illuminated, conduct the following troubleshooting procedure.

If the ECM detects trouble, the MIL illuminates. At this time, the ECM records a DTC in the memory.

WIRING DIAGRAM

A0019FSE22
*1 from IG2 Relay
*2 Combination Meter

PROCEDURE


  1. CHECK THAT MIL IS ILLUMINATED


    1. Turn the engine switch on (IG).

    2. Check the illumination of the MIL.

      Result
      Result Proceed to

      MIL remains illuminated

      (Even after engine switch is turned on (IG) and several seconds have passed, MIL still remains illuminated)

      		 A

      MIL remains off

      (Does not illuminate at all)

      		 B
      MIL illuminates for several seconds, but turns off after engine is started C

    B

    CHECK THAT ENGINE STARTS Click here

    C

    SYSTEM OK

    A

  2. CHECK IF MIL TURNS OFF


    1. Connect the intelligent tester to the DLC3.

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

    3. Check if DTCs have been stored Click here. If DTCs are present, 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 (FOR SHORT)

    A001C53E02
    *1 ECM Connector

    1. Disconnect the A14 ECM connector.

    2. Turn the engine switch on (IG).

    3. Check that the MIL is not illuminated.

      OK
      MIL is not illuminated.

    OK

    REPLACE ECM Click here

    NG

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

    A001EPNE02
    *1 Front view of wire harness connector: (to Combination Meter)
    *2 ECM Connector

    1. Disconnect the L10 combination meter connector.

    2. Disconnect the A14 ECM connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      L10-11 (EFI) - A14-11 (W) Always Below 1 Ω
      L10-11 (EFI) or A14-11 (W) - Body ground Always 10 kΩ or higher

    OK

    REPAIR OR REPLACE NO. 1 METER ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  5. CHECK THAT ENGINE STARTS


    1. Start the engine.

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

      Tech Tips

      *: The intelligent tester cannot communicate with the ECM.


    B

    GO TO VC OUTPUT CIRCUIT Click here

    A

  6. CHECK HARNESS AND CONNECTOR (COMBINATION METER - BODY GROUND)

    A001C53E02
    *1 ECM Connector

    1. Disconnect the A14 ECM connector.

    2. Turn the engine switch on (IG).

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      A14-11 (W) - Body ground Engine switch on (IG) 11 to 14 V

    OK

    REPLACE ECM Click here

    NG

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

    A001EPNE02
    *1 Front view of wire harness connector: (to Combination Meter)
    *2 ECM Connector

    1. Disconnect the L10 combination meter connector.

    2. Disconnect the A14 ECM connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      L10-11 (EFI) - A14-11 (W) Always Below 1 Ω
      L10-11 (EFI) or A14-11 (W) - Body ground Always 10 kΩ or higher

    OK

    REPAIR OR REPLACE NO. 1 METER ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR