Toyota 4Runner manuals

Toyota 4Runner: A-TRAC Indicator Light Remains ON

DESCRIPTION

This is the A-TRAC main switch circuit. When the A-TRAC switch is turned on with the transfer in L4, the A-TRAC function is available and the A-TRAC indicator light illuminates.

WIRING DIAGRAM


CAUTION / NOTICE / HINT

NOTICE:

When replacing the master cylinder solenoid, perform calibration (See page ).


PROCEDURE

1.

CHECK CAN COMMUNICATION LINE

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the ignition switch to ON.

(d) Turn the Techstream on.

(e) Select CAN Bus Check from the System Selection Menu screen and follow the prompts on the screen to inspect the CAN bus (See page ).


OK:

CAN Bus Check indicates no malfunctions in CAN communication.


NG

GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)

OK

2.

INSPECT TRACTION CONTROL SWITCH (A-TRAC SWITCH)

(a) Remove the A-TRAC switch (See page ).


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

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

8 (ATRC) - 5 (E)

Pushed in

Below 1 Ω

Not pushed in

10 kΩ or higher

Text in Illustration

*a

Component without harness connected

(A-TRAC Switch)



NG

REPLACE TRACTION CONTROL SWITCH (A-TRAC SWITCH)

OK

3.

CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - A-TRAC SWITCH)

(a) Disconnect the A6 skid control ECU connector.

(b) Disconnect the U3 A-TRAC switch connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A6-13 (ATRC) - U3-8 (ATRC)

Always

Below 1 Ω

A6-13 (ATRC) - Body ground

Always

10 k Ω or higher

U3-5 (E) - Body ground

Always

Below 1 Ω


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

READ VALUE USING TECHSTREAM (A-TRAC INDICATOR LIGHT)

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the ignition switch to ON.

(d) Turn the Techstream on.

(e) Enter the following menus: Chassis / ABS/VSC/TRAC / Data List.

(f) Check the condition of the A-TRAC switch by operating the Techstream.

ABS/VSC/TRAC

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

A-TRAC Indicator Light

A-TRAC indicator light/ ON or OFF

ON: Indicator light on

ON: Indicator light off

-

OK:

The Techstream displays ON or OFF according to A-TRAC switch operation.


OK

GO TO METER / GAUGE SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)


NG

REPLACE MASTER CYLINDER SOLENOID

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