SFI SYSTEM (w/ Secondary Air Injection System) MIL Circuit

DESCRIPTION

The MIL (Malfunction Indicator Lamp) is used to indicate vehicle malfunction detections by the ECM. By turning the ignition switch to the ON position, 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. If the MIL remains illuminated or is not illuminated, conduct the following troubleshooting procedure using an intelligent tester.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. CHECK WHETHER MIL TURNS OFF

   
   

   1. Connect an intelligent tester to the DLC3.

   2. Turn the ignition switch to the ON position.

   3. Turn the tester ON.

   4. Check whether any DTCs have been stored Click here. Note them down if necessary.

   5. Clear DTCs Click here.

   6. Check if the MIL turns off.

      OK
      MIL turns off.

   
   

   OK

   REPAIR CIRCUIT INDICATED BY OUTPUT DTC

   NG

2. CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT IN HARNESS)

   
   

   1. 

      Disconnect the B7 ECM connector.

   2. Turn the ignition switch to the ON position.

   3. Check that the MIL is not illuminated.

      OK
      MIL is not illuminated.

   4. Reconnect the ECM connector.

   
   

   OK

   REPLACE ECM

   NG

   CHECK AND REPLACE HARNESS AND CONNECTOR (COMBINATION METER - ECM)

3. CHECK THAT MIL IS ILLUMINATED

   
   

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

      OK
      MIL is illuminated.

   
   

   OK

   SYSTEM OK

   NG

4. INSPECT COMBINATION METER ASSEMBLY (MIL CIRCUIT)

   
   

   1. See the combination meter troubleshooting procedure Click here.

   
   

   NG

   REPAIR OR REPLACE COMBINATION METER ASSEMBLY

   OK

   CHECK AND REPLACE HARNESS AND CONNECTOR (COMBINATION METER - ECM)