SFI SYSTEM > MIL Circuit

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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


A112701E01


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)
G035618E01

  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)