SFI SYSTEM MIL Circuit

DESCRIPTION

The MIL (Malfunction Indicator Lamp) is used to indicate vehicle malfunctions detected by the ECM. When the ignition switch is turned to ON, power is supplied to the MIL circuit, which illuminates the MIL.

The MIL operation can be checked visually: When the ignition switch is turned to ON, the MIL should be illuminated and should turn off after engine is started. If the MIL remains illuminated or is not illuminated, conduct the following troubleshooting procedure using the GTS.

WIRING DIAGRAM

*1	Combination Meter Assembly
*2	CAN Communication Line

CAUTION / NOTICE / HINT

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

   
   

   B

   CHECK THAT ENGINE STARTS Click here

   C

   CHECK FOR INTERMITTENT PROBLEMS Click here

   A

2. CHECK WHETHER MIL TURNS OFF

   
   

   1. Connect the GTS to the DLC3.

   2. Turn the ignition switch to ON.

   3. Turn the GTS on.

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

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

      Result

      Result	Proceed to
      No DTC detected	A
      Any DTCs detected	B

      Tech Tips

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

   
   

   A

   GO TO METER / GAUGE SYSTEM Click here

   B

   REPAIR CIRCUITS INDICATED BY OUTPUT DTCS

3. CHECK THAT ENGINE STARTS

   
   

   1. Turn the ignition switch to ON.

   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.

   
   

   A

   REPLACE COMBINATION METER Click here

   B

   GO TO VC OUTPUT CIRCUIT Click here