Toyota 4Runner manuals

Toyota 4Runner: IG Signal Circuit

DESCRIPTION

This circuit detects the ignition switch ON or off condition, and sends it to the main body ECU.

WIRING DIAGRAM


CAUTION / NOTICE / HINT

NOTICE:

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

PROCEDURE

1.

READ VALUE USING TECHSTREAM (IGNITION SWITCH)

(a) Using the Techstream, read the Data List (See page ).


Main Body

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

IG SW

Ignition switch ON signal / ON or OFF

ON: Ignition switch ON

OFF: Ignition switch off

-

OK:

Normal conditions listed above are displayed.


OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE


NG

2.

CHECK HARNESS AND CONNECTOR (BATTERY - MAIN BODY ECU)

(a) Remove the main body ECU (See page ).



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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

A-32 (IG) - Body ground

Ignition switch ON

11 to 14 V

Text in Illustration

*a

Front view of wire harness connector

(to Main Body ECU)


OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

ACC Signal Circuit
DESCRIPTION This circuit detects the ignition switch ACC or off condition, and sends it to the main body ECU. WIRING DIAGRAM CAUTION / NOTICE / HINT NOTICE: Inspect the fuses for circuits rel ...

Back Door Courtesy Switch Circuit
DESCRIPTION The multiplex network door ECU receives a back door open/closed signal from the back door lock. WIRING DIAGRAM PROCEDURE 1. READ VALUE USING TECHSTREAM (BACK ...

Other materials about Toyota 4Runner:

Brake Warning Light Remains ON
DESCRIPTION The BRAKE warning light comes on when brake fluid is insufficient, the parking brake is applied or the EBD is defective. WIRING DIAGRAM CAUTION / NOTICE / HINT NOTICE: When replacing the master cylinder solenoid, perform calibration (See p ...

Automatic running boards
The Automatic running boards are linked to the side door operations, extending and retracting when a side door is opened and closed. When a door is opened or closed, the board on the same side extends or retracts. 1. Opening a door: The appropriate boar ...

© 2016-2020 | www.to4runner.net

0.0068