SFI SYSTEM MIL Circuit

DESCRIPTION

The MIL (Malfunction Indicator Lamp) is used to indicate vehicle malfunctions detected by the ECM. When the power 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 power switch is turned on (IG), the MIL should be illuminated and should turn off after power switch on (READY). If the MIL remains illuminated or is not illuminated, conduct the following troubleshooting procedure using the GTS.

CAUTION / NOTICE / HINT

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 DTC OUTPUT RECURS

   
   

   1. Connect the GTS to the DLC3.

   2. Turn the power switch on (IG).

   3. Turn the GTS on.

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

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

      Table 2. Result

      Result	Proceed to
      DTC is not detected	A
      Any DTCs are detected	B

      Tip:

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

   
   
   • AClick here
   • B

     REPAIR CIRCUITS INDICATED BY OUTPUT DTCS

3. Click here

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

   
   
   1. 

      Disconnect the A22 ECM connector.

   2. Turn the power switch on (IG).

   3. Check that the MIL is not illuminated.

      OK
      MIL is not illuminated.

      Table 3. Text in Illustration

      *a	Front view of wire harness connector (to ECM)

   
   
   • OK

     REPLACE ECM (Click here)

   • NGClick here
4. Click here

   CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - ECM)

   
   

   1. Disconnect the combination meter assembly connector.

   2. Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition H14-5 (CHK) or A22-30 (W) - Body ground Always 10 kΩ or higher

   
   
   • OK

     REPLACE COMBINATION METER ASSEMBLY (Click here)

   • NG

     REPAIR OR REPLACE HARNESS OR CONNECTOR

5. Click here

   CHECK THAT MIL IS ILLUMINATED

   
   

   1. Check if the MIL is illuminated when the power switch is turned on (IG).

      OK
      MIL should be illuminated.

   
   
   • OK

     CHECK FOR INTERMITTENT PROBLEMS (Click here)

   • NGClick here
6. Click here

   CHECK THAT ENGINE STARTS

   
   

   1. Connect the GTS to the DLC3.

   2. Turn the power switch on (IG).

   3. Turn the GTS on.

   4. Put the engine in inspection mode (maintenance mode) (Click here).

   5. Start the engine.

      Table 4. Result

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

      Tip:

      *: The GTS cannot communicate with the ECM.

   
   
   • AClick here
   • B

     GO TO VC OUTPUT CIRCUIT (Click here)

7. Click here

   CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - ECM)

   
   

   1. Disconnect the combination meter assembly connector.

   2. Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition H14-5 (CHK) - A22-30 (W) Always Below 1 Ω

   
   
   • OK

     REPLACE COMBINATION METER ASSEMBLY (Click here)

   • NG

     REPAIR OR REPLACE HARNESS OR CONNECTOR