Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: MIL Circuit

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Engine / 2gr-fks Engine Control / Sfi System / 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 engine switch is first turned on (IG), the MIL should be illuminated and should then turn off after the engine is started. If the MIL remains illuminated or is not illuminated, conduct the following troubleshooting procedure using the Techstream.

WIRING DIAGRAM

PROCEDURE

1.	CHECK THAT MIL IS ILLUMINATED

(a) Perform troubleshooting in accordance with the table below.

MIL	Condition	Proceed to
Illuminates → Turns off	Engine switch on (IG) → engine is started	A
Other than above	-	B

CHECK FOR INTERMITTENT PROBLEMS

2.	CHECK COMMUNICATION BETWEEN TECHSTREAM AND ECM

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Check the communication between the Techstream and ECM.

HINT:

It can be checked using the "Engine" item of the Data List.

Result	Proceed to
Communication is possible	A
Communication is not possible	B

GO TO VC OUTPUT CIRCUIT

3.	CHECK WHETHER DTC OUTPUT RECURS

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: System Select / Health Check.

(e) Check if any DTCs have been detected. Note down any DTCs.

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

HINT:

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

REPAIR CIRCUIT INDICATED BY OUTPUT

4.	PERFORM ACTIVE TEST USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Combination Meter / Active Test / Check Engine Warning.

Body Electrical > Combination Meter > Active Test

Tester Display
Check Engine Warning

(e) Check the status of the MIL while performing the Active Test.

Result	Proceed to
Changes	A
Does not change	B

REPLACE ECM

REPLACE COMBINATION METER ASSEMBLY

Lack of Power

EVAP System Tank Vapor Line Restricted/Blocked (P00FE00)

See More:

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