СИСТЕМА SFI MIL Circuit

DESCRIPTION

The MIL (Malfunction Indicator Lamp) is used to indicate the detection of vehicle malfunctions 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 first turned to ON, 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 intelligent tester.

INSPECTION PROCEDURE

PROCEDURE

1. Click here

   CHECK THAT MIL IS ILLUMINATED

   
   

   1. Perform troubleshooting in accordance with the table below.

      Table 1. Result

      Result	Proceed to
      MIL remains on	A
      MIL does not illuminate	B

   
   
   • AClick here
   • BClick here
2. Click here

   CHECK WHETHER MIL TURNS OFF

   
   

   1. Connect the intelligent tester to the DLC3.

   2. Turn the ignition switch to ON.

   3. Turn the intelligent tester on.

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

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

   6. Clear the DTCs (Click here).

   7. Check if the MIL goes off.

      OK
      MIL goes off.

   
   
   • OKClick here
   • NGClick here
3. Click here

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

   
   

   1. Disconnect the ECM connector.

   2. Turn the ignition switch to ON.

   3. Check that the MIL is not illuminated.

      OK
      MIL is not illuminated.

   
   
   • OKClick here
   • NGClick here
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
      Tester Connection Condition Specified Condition B7-30 (W) or H20-32 (EGW) - Body ground Always 10 kΩ or higher

   
   
   • OKClick here
   • NGClick here
5. Click here

   CHECK THAT MIL IS ILLUMINATED

   
   

   1. Check if the MIL is illuminated when the ignition switch is turned to ON.

      OK
      MIL is illuminated.

   
   
   • OKClick here
   • NGClick here
6. Click here

   CHECK THAT ENGINE STARTS

   
   

   1. Turn the ignition switch to ON.

   2. Start the engine.

      Table 2. Result

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

      Tip:

      *: The intelligent tester cannot communicate with the ECM.

   
   
   • AClick here
   • BClick here
7. 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
      Tester Connection Condition Specified Condition B7-30 (W) - H20-32 (EGW) Always Below 1 Ω

   
   
   • OKClick here
   • NGClick here
8. Click here

   REPAIR CIRCUITS INDICATED BY OUTPUT DTCSClick here

9. Click here

   REPLACE ECMClick here

10. Click here

    REPLACE COMBINATION METER ASSEMBLYClick here

11. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

12. Click here

    END

13. Click here

    GO TO VC OUTPUT CIRCUITClick here

14. Click here

    REPLACE COMBINATION METER ASSEMBLYClick here

15. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR