GSIC - Global Service Information Center

### SFI SYSTEM > MIL Circuit

## for Preparation Click here

## DESCRIPTION

The Malfunction Indicator Lamp (MIL) is used to indicate malfunction detections by the ECM.
By turning the ignition switch 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 ON is first turned 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 the intelligent tester.

## WIRING DIAGRAM

## INSPECTION PROCEDURE

HINT:

  Troubleshoot each trouble symptom in accordance with the chart below.

MIL remains illuminated | Start inspection from step 1
MIL not illuminated | Start inspection from step 3

1.CHECK THAT MIL IS ILLUMINATED

1. Troubleshoot each trouble symptom in accordance with the chart below.

   Result:

     Condition | Proceed to
     MIL remains illuminated | A
     MIL not illuminated | B

| B |

Go to step 4

A |

2.CHECK WHETHER MIL TURNS OFF

1. Connect the intelligent tester to the DLC3.

1. Turn the ignition switch ON and turn the tester ON.

1. Check whether any DTCs have been stored. Write them down if necessary.

1. Clear DTCs (Click here).

1. Check if the MIL turns OFF.

   OK:
     MIL turns off.

| OK |

REPAIR CIRCUIT INDICATED BY OUTPUT DTC

NG |

3.CHECK WIRE HARNESS (CHECK FOR SHORT IN WIRE HARNESS)

1. Disconnect the E13 ECM connector.

1. Turn the ignition switch ON.

1. Check the MIL is not illuminated.

   OK:
     MIL is not illuminated.

| OK |

REPLACE ECM

NG |

REPAIR OR REPLACE HARNESS AND CONNECTOR (COMBINATION METER - ECM)

4.CHECK THAT MIL IS ILLUMINATED

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

   OK:
     MIL illuminates.

| OK |

SYSTEM OK

NG |

5.INSPECT COMBINATION METER ASSEMBLY (MIL CIRCUIT)

1. See the combination meter troubleshooting procedures (Click here).

| NG |

REPAIR OR REPLACE COMBINATION METER ASSEMBLY

OK |

REPAIR OR REPLACE HARNESS AND CONNECTOR (COMBINATION METER - ECM)