SFI SYSTEM MIL Circuit

DESCRIPTION

The MIL (Malfunction Indicator Lamp) is used to indicate vehicle malfunction detections by the ECM. When the engine 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 engine switch is first turned 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 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 engine switch on (IG) and turn the tester on.

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

   4. Check if any DTCs are output. Note down any DTCs.

   5. Clear DTCs (Click here).

   6. Check if the MIL goes off.

      Standard
      MIL goes off

   
   
   • OKClick here
   • NGClick here
3. Click here

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

   
   

   1. Disconnect the A38 ECM connector.

   2. Turn the engine switch on (IG).

   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 A38 ECM connector.

   2. Disconnect the E8 combination meter connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition A38-24 (W) or E8-12 (CHK) - 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 engine switch is turned on (IG).

      OK
      MIL is illuminated.

   
   
   • OKClick here
   • NGClick here
6. Click here

   CHECK THAT ENGINE STARTS

   
   

   1. Turn the engine switch on (IG).

   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 A38 ECM connector.

   2. Disconnect the E8 combination meter connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition A38-24 (W) - E8-12 (CHK) 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

    SYSTEM OK

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