Toyota Venza manuals

Toyota Venza: ECU Power Source Circuit

DESCRIPTION

When the ignition switch is turned to ON, voltage from the ECM's MREL terminal is applied to the EFI MAIN relay. This causes the contacts of the EFI MAIN relay to close, which supplies power to terminal +B of the TCM.

WIRING DIAGRAM


PROCEDURE

1.

CHECK HARNESS AND CONNECTOR (TCM - BODY GROUND)

(a) Turn the ignition switch off.


(b) Disconnect the TCM connectors.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

B40-8 (E1) - Body ground

Always

Below 1 Ω

Text in Illustration

*1

Front view of wire harness connector

(to TCM)


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR


OK

2.

INSPECT ECU TERMINAL VOLTAGE (+B TERMINAL)

(a) Disconnect the TCM connectors.


(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

B40-18 (+B) - Body ground

Ignition switch ON

11 to 14 V

Text in Illustration

*1

Front view of wire harness connector

(to TCM)


OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE


NG

3.

CHECK HARNESS AND CONNECTOR (TCM - ENGINE ROOM JUNCTION BLOCK ASSEMBLY)

(a) Turn the ignition switch off.

(b) Disconnect the TCM connector.

(c) Remove the engine room junction block assembly from the engine room relay block.

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


Standard Resistance (Check for Open):

Tester Connection

Condition

Specified Condition

B40-18 (+B) - 1F-18 (+B)

Always

Below 1 Ω

Standard Resistance (Check for Short):

Tester Connection

Condition

Specified Condition

B40-18 (+B) or 1F-18 (+B) - Body ground

Always

10 kΩ or higher

Text in Illustration

*1

Engine Room Junction Block Assembly

*2

Front view of wire harness connector

(to Engine Room Junction Block Assembly)

*3

Front view of wire harness connector

(to TCM)


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR


OK

4.

INSPECT ENGINE ROOM JUNCTION BLOCK ASSEMBLY

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

1F-9 - 1F-18

Always

Below 1 Ω

Text in Illustration

*1

Component without harness connected

(Engine Room Junction Block Assembly)



OK

GO TO ECM POWER SOURCE CIRCUIT (ENGINE CONTROL SYSTEM / SFI SYSTEM)


NG

REPLACE ENGINE ROOM JUNCTION BLOCK ASSEMBLY

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