SFI SYSTEM > MIL Circuit

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DESCRIPTION

The MIL (Malfunction Indicator Lamp) is used to indicate vehicle malfunctions detected by the ECM. When the ignition switch is turned 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. If the MIL remains illuminated or is not illuminated, conduct the following troubleshooting procedure using an intelligent tester.

WIRING DIAGRAM


A201264E02


INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.

1.CHECK THAT MIL IS ILLUMINATED

  1. Perform troubleshooting in accordance with the table below.
    Result 
    Result
    		Proceed to
    MIL remains ON
    		A
    MIL does not illuminate
    		B



B
Go to step 5
A


2.CHECK WHETHER MIL TURNS OFF

  1. Connect an intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the tester on.

  1. Enter the following menus: Powertrain / Engine and ECT / DTC.

  1. Check if any DTCs have been stored. Note down any DTCs.

  1. Enter the following menus: Powertrain / Engine and ECT / DTC / Clear.

  1. Clear DTCs.

  1. Check if the MIL goes off.

    OK:
    MIL should go off.



NG
Go to step 3
OK

REPAIR CIRCUITS INDICATED BY OUTPUT DTCS (Click here)  

3.CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT IN WIRE HARNESS)
A200912E02

  1. Disconnect the ECM connector.

  1. Turn the ignition switch to ON.

  1. Check that the MIL is not illuminated.

    OK:
    MIL is not illuminated.

    Text in Illustration 
    *1
    		Front view of wire harness connector:
    (to ECM)

  1. Reconnect the ECM connector.



NG
Go to step 4
OK

REPLACE ECM (Click here)  

4.CHECK HARNESS AND CONNECTOR (COMBINATION METER - ECM)
A112624E11

  1. Disconnect the combination meter connector.

  1. Disconnect the ECM connector.

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

    Standard Resistance (Check for Short):
    Tester Connection
    		Condition
    		Specified Condition
    A18-24 (W) or D2-5 - Body ground
    		Always
    		10 kΩ or higher

    Text in Illustration 
    *1
    		Front view of wire harness connector:
    (to Combination Meter)
    *2
    		Front view of wire harness connector:
    (to ECM)

  1. Reconnect the combination meter connector.

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE COMBINATION METER (Click here)  

5.CHECK THAT MIL IS ILLUMINATED

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

    OK:
    MIL should be illuminated.



NG
Go to step 6
OK

END 

6.CHECK THAT ENGINE STARTS

  1. Turn the ignition switch to ON.

  1. Start the engine.
    Result 
    Result
    		Proceed to
    Engine starts
    		A
    Engine does not start*
    		B

    HINT:
    *: An intelligent tester cannot communicate with the ECM.



B
GO TO VC OUTPUT CIRCUIT (Click here)
A


7.INSPECT COMBINATION METER (MIL CIRCUIT)

  1. Check the MIL circuit (Click here).



NG
REPLACE COMBINATION METER (Click here)
OK

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