СИСТЕМА ECD MIL Circuit

DESCRIPTION

The Malfunction Indicator Lamp (MIL) 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, 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 ON, the MIL should be illuminated and should then turn off after the engine is started. If the MIL remains illuminated or is not illuminated, conduct the following troubleshooting procedure using the GTS.

INSPECTION PROCEDURE

PROCEDURE

1. Click here

   CHECK THAT MIL IS ILLUMINATED

   
   

   1. Perform troubleshooting in accordance with the table below.

      Table 1. Result

      Result	Condition	Proceed to
      ON → OFF	Ignition switch ON → engine is started	A
      MIL does not illuminate	Engine does not start	B
      MIL remains ON	-	C

   
   
   • AClick here
   • BClick here
   • CClick here
2. Click here

   CHECK WHETHER DTC OUTPUT RECURS

   
   

   1. Connect the GTS to the DLC3.

   2. Turn the ignition switch to ON.

   3. Turn the GTS on.

   4. Enter the following menus: System Select / Health Check.

   5. Check the DTCs.

      Table 2. Result

      Result	Proceed to
      DTC is not output	A
      Any DTC is output	B

   
   
   • AClick here
   • BClick here
3. Click here

   PERFORM ACTIVE TEST USING GTS

   
   

   1. Connect the GTS to the DLC3.

   2. Turn the ignition switch to ON.

   3. Turn the GTS on.

   4. Enter the following menus: Body Electrical / Combination Meter / Active Test / Check Engine Indicator.

   5. Check the status of the MIL while performing the Active Test.

      Table 3. Result

      Result	Proceed to
      Changes	A
      Does not change	B

   
   
   • AClick here
   • BClick here
4. Click here

   GO TO VC OUTPUT CIRCUITClick here

5. Click here

   CHECK FOR INTERMITTENT PROBLEMSClick here

6. Click here

   REPAIR CIRCUIT INDICATED BY OUTPUT DTC

7. Click here

   REPLACE COMBINATION METER ASSEMBLYClick here

8. Click here

   REPLACE ECMClick here