MIL Circuit

DESCRIPTION

The Malfunction Indicator Lamp (MIL) is used to indicate vehicle malfunctions detected by the ECM.

The MIL operation can be checked visually. When the power switch is turned on (IG), the MIL should be illuminated and should then turn off after the power switch on (READY). If the MIL remains illuminated or is not illuminated, conduct the following troubleshooting procedure using the GTS.

WIRING DIAGRAM


*1	Combination Meter Assembly
*2	CAN Communication Line

PROCEDURE

CHECK THAT MIL IS ILLUMINATED

Perform troubleshooting in accordance with the table below.

Result

Condition	Result	Proceed to
Power switch on (IG) → Power switch on (READY)	MIL ON→MIL OFF	A
	MIL does not illuminate (Engine start not possible)	B
	MIL does not illuminate (Engine start possible)	C
	MIL remains ON	D

A

CHECK FOR INTERMITTENT PROBLEMS Click here

B

GO TO VC OUTPUT CIRCUIT Click here

C

GO TO METER / GAUGE SYSTEM Click here

D

CHECK WHETHER DTC OUTPUT RECURS

Connect the GTS to the DLC3.
Turn the power switch on (IG).
Turn the GTS on.
Enter the following menus: System Select / Health Check.

Check if any DTCs have been detected. Note down any DTCs.

Result

Result	Proceed to
DTCs are not output	A
DTCs are output	B

Tech Tips

Check for detected DTCs output from other ECUs which relate to the MIL.

B

REPAIR CIRCUITS INDICATED BY OUTPUT DTCS

A

PERFORM ACTIVE TEST USING GTS

Connect the GTS to the DLC3.
Turn the power switch on (IG).
Turn the GTS on.
Enter the following menus: Body Electrical / Combination Meter / Active Test / Check Engine Indicator.

Body Electrical > Combination Meter > Active Test

Tester Display

Check Engine Indicator

Tester Display
Check Engine Indicator

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

Result

Result	Proceed to
Changes	A
Does not change	B

A

REPLACE ECM Click here

B

GO TO METER / GAUGE SYSTEM Click here

SFI SYSTEM(w/ EGR System) MIL Circuit