Toyota Venza: MIL Circuit

Toyota Venza Service Manual / 1ar-fe Engine Control / Sfi System / MIL Circuit

DESCRIPTION

The MIL (Malfunction Indicator Lamp) is used to indicate vehicle malfunctions detected by the ECM. By turning the ignition switch to 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 turned to 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. If the ECM detects any trouble, the MIL illuminates. At this time, the ECM records a DTC in the memory.

WIRING DIAGRAM

PROCEDURE

1.	CHECK THAT MIL ILLUMINATES

(a) Turn the ignition switch to ON.

(b) Check the illumination of the MIL.

Result	Proceed to
MIL remains illuminated (Illuminated at all)	A
MIL remains off (Does not illuminate at all)	B
MIL illuminates, but turns off after engine is started	C

GO TO STEP 5

CHECK FOR INTERMITTENT PROBLEMS

2.	CHECK WHETHER MIL TURNS OFF

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(d) Enter the following menus: Powertrain / Engine / Trouble Codes.

(e) Check if any DTCs have been stored. Note any DTCs.

(f) Clear the DTCs (See page ).

(g) Check if the MIL goes off.

Result	Proceed to
MIL goes off	A
MIL does not go off	B

REPAIR CIRCUIT INDICATED BY OUTPUT DTC

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

(a) Disconnect the ECM connector.

(b) Turn the ignition switch to ON.

Result	Proceed to
MIL is not illuminated	A
MIL is illuminated	B

Text in Illustration

*a	Front view of wire harness connector (to ECM)

REPLACE ECM

4.	CHECK HARNESS AND CONNECTOR (ACCESSORY METER ASSEMBLY - ECM)

(a) Disconnect the accessory meter assembly connector.

(b) Disconnect the ECM connector.

Standard Resistance (Check for Short):

Tester Connection	Condition	Specified Condition
F2-10 (CHK) or A49-36 (W) - Body ground	Always	10 kΩ or higher

REPLACE ACCESSORY METER ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR (ACCESSORY METER ASSEMBLY - ECM)

5.	CHECK IF ENGINE STARTS

(a) Start the engine.

Result	Proceed to
Engine starts	A
Engine does not start*	B

HINT:

*: The Techstream cannot communicate with the ECM.

GO TO VC OUTPUT CIRCUIT

6.	CHECK HARNESS AND CONNECTOR (ECM TERMINAL VOLTAGE)

(a) Disconnect the ECM connector.

(b) Turn the ignition switch to ON.

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
A49-36 (W) - Body ground	Ignition switch ON	11 to 14 V

REPLACE ECM

7.	CHECK HARNESS AND CONNECTOR (ACCESSORY METER ASSEMBLY - ECM)

(a) Disconnect the accessory meter assembly connector.

(b) Disconnect the ECM connector.

Standard Resistance (Check for Open):

Tester Connection	Condition	Specified Condition
F2-10 (CHK) - A49-36 (W)	Always	Below 1 Ω

REPLACE ACCESSORY METER ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR (ACCESSORY METER ASSEMBLY - ECM)

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