Toyota Venza manuals

Toyota Venza: 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


B

GO TO STEP 5


C

CHECK FOR INTERMITTENT PROBLEMS


A

2.

CHECK WHETHER MIL TURNS OFF

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream 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


A

REPAIR CIRCUIT INDICATED BY OUTPUT DTC


B

3.

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

(a) Disconnect the ECM connector.


(b) Turn the ignition switch to ON.

(c) Check if the MIL is illuminated.

Result

Proceed to

MIL is not illuminated

A

MIL is illuminated

B

Text in Illustration

*a

Front view of wire harness connector

(to ECM)


A

REPLACE ECM


B

4.

CHECK HARNESS AND CONNECTOR (ACCESSORY METER ASSEMBLY - ECM)

(a) Disconnect the accessory meter assembly connector.

(b) Disconnect the ECM connector.

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

Standard Resistance (Check for Short):

Tester Connection

Condition

Specified Condition

F2-10 (CHK) or A49-36 (W) - Body ground

Always

10 kΩ or higher


OK

REPLACE ACCESSORY METER ASSEMBLY


NG

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.


B

GO TO VC OUTPUT CIRCUIT


A

6.

CHECK HARNESS AND CONNECTOR (ECM TERMINAL VOLTAGE)

(a) Disconnect the ECM connector.

(b) Turn the ignition switch to ON.

(c) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

A49-36 (W) - Body ground

Ignition switch ON

11 to 14 V


OK

REPLACE ECM


NG

7.

CHECK HARNESS AND CONNECTOR (ACCESSORY METER ASSEMBLY - ECM)

(a) Disconnect the accessory meter assembly connector.

(b) Disconnect the ECM connector.

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

Standard Resistance (Check for Open):

Tester Connection

Condition

Specified Condition

F2-10 (CHK) - A49-36 (W)

Always

Below 1 Ω


OK

REPLACE ACCESSORY METER ASSEMBLY


NG

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

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