Toyota 4Runner manuals

Toyota 4Runner: 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 IDs stored in the old ECU using the Techstream and write them down before removal.
  • It is necessary to perform registration of the transmitter IDs into the tire pressure warning ECU after the ECU and/or the tire pressure warning valve and transmitter has been replaced (See page ).

  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1.

CHECK HARNESS AND CONNECTOR (ECU - BATTERY)

(a) Disconnect the F7 ECU connector.


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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

F7-7 (IG) - Body ground

Ignition switch ON

11 to 14 V

Ignition switch off

Below 1 V

Text in Illustration

*a

Front view of wire harness connector

(to Tire Pressure Warning ECU)


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR


OK

2.

CHECK HARNESS AND CONNECTOR (ECU - BODY GROUND)

(a) Disconnect the F7 ECU connector.


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

Standard Resistance:

Tester Connection

Condition

Specified Condition

F7-9 (GND) - Body ground

Always

Below 1 Ω

Text in Illustration

*a

Front view of wire harness connector

(to Tire Pressure Warning ECU)


OK

REPLACE TIRE PRESSURE WARNING ECU


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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