Toyota 4Runner manuals

Toyota 4Runner: Certification ECU Power Source Circuit

DESCRIPTION

This circuit provides power to the certification ECU.

WIRING DIAGRAM


CAUTION / NOTICE / HINT

NOTICE:

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

PROCEDURE

1.

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

(a) Disconnect the F79 ECU connector.


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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

F79-1 (+B) - Body ground

Always

11 to 14 V

F79-16 (IG) - Body ground

Engine switch off

Below 1 V

F79-16 (IG) - Body ground

Engine switch on (IG)

11 to 14 V

F79-17 (CUTB) - Body ground

Always

11 to 14 V

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

F79-15 (E) - Body ground

Always

Below 1 Ω

Text in Illustration

*a

Front view of wire harness connector

(to Certification ECU)


OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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