Toyota Venza manuals

Toyota Venza: ECU Power Source Circuit

DESCRIPTION

This is the power source for the tire pressure warning ECU.

WIRING DIAGRAM


CAUTION / NOTICE / HINT

NOTICE:

  • When replacing the tire pressure warning ECU, read the transmitter IDs stored in the old ECU using the Techstream and write them down before removal.
  • It is necessary to perform registration (See page ) of the transmitter IDs into the tire
    pressure warning ECU after the ECU has been replaced.

PROCEDURE

1.

INSPECT FUSE (ECU-IG NO. 2)

(a) Remove the ECU-IG No. 2 fuse from the driver side junction block.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

ECU-IG No. 2 fuse

Always

Below 1 Ω


NG

REPLACE FUSE


OK

2.

INSPECT IGNITION RELAY NO. 1

(a) Remove the IG1 relay from the driver side junction block.


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

Standard Resistance:

Tester Connection

Condition

Specified Condition

3 - 5

Battery voltage is not applied between terminals 1 and 2

10 kΩ or higher

Battery voltage is applied between terminals 1 and 2

Below 1 Ω


NG

REPLACE IGNITION RELAY NO. 1


OK

3.

CHECK HARNESS AND CONNECTOR (ECU - BATTERY AND BODY GROUND)

(a) Disconnect the D31 ECU connector.


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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

D31-7 (IG) - Body ground

Ignition switch ON

11 to 14 V

Ignition switch off

Below 1 V

Text in Illustration

*1

Front view of wire harness connector

(to Tire Pressure Warning ECU)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D31-9 (GND) - Body ground

Always

Below 1 Ω


OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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DESCRIPTION The tire pressure warning valve and transmitter installed in each tire and wheel assembly measures the tire pressures. The measured values are transmitted as radio waves to the tire p ...

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DESCRIPTION If the tire pressure warning ECU detects a malfunction, the tire pressure warning light blinks for 1 minute then stays on and tire pressure monitor is canceled at the same time. At th ...

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