Toyota 4Runner: Certification ECU Power Source Circuit

Toyota 4Runner Service Manual / Vehicle Interior / Theft Deterrent / Keyless Entry / Engine Immobiliser System(w/ Smart Key System) / 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

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)

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

REPAIR OR REPLACE HARNESS OR CONNECTOR

Engine Immobiliser System Malfunction (B2799)

DESCRIPTION This DTC is stored when one of the following occurs: 1) the ECM detects errors in its own communications with the ID code box; 2) the ECM detects errors in the communication lines; or ...

ID Code Box Power Source Circuit

DESCRIPTION This circuit provides power to operate the ID code box. WIRING DIAGRAM CAUTION / NOTICE / HINT NOTICE: Inspect the fuses for circuits related to this system before performing the fo ...

Other materials about Toyota 4Runner:

Removal
REMOVAL PROCEDURE 1. DRAIN AUTOMATIC TRANSMISSION FLUID 2. REMOVE AUTOMATIC TRANSMISSION OIL PAN SUB-ASSEMBLY 3. REMOVE VALVE BODY OIL STRAINER ASSEMBLY 4. DISCONNECT TRANSMISSION WIRE 5. REMOVE TRANSMISSION VALVE BODY ASSEMBLY (a) Remove th ...

Short to GND in CAN Bus Line
DESCRIPTION There may be a short circuit between the CAN bus lines and GND when the resistance between terminals 6 (CANH) and 4 (CG) or terminals 14 (CANL) and 4 (CG) of the DLC3 is below 200 Ω. Symptom Trouble Area ...