Toyota 4Runner: A-TRAC Indicator Light does not Come ON

Toyota 4Runner Service Manual / Brake / Brake Control / Dynamic Control Systems / Vehicle Stability Control System(for Hydraulic Brake Booster) / A-TRAC Indicator Light does not Come ON

DESCRIPTION

The A-TRAC does not operate even if the A-TRAC switch is pressed under the following conditions:

The TRAC or VSC system is faulty.
The temperature inside the hydraulic brake booster increases and the A-TRAC operation is suspended.

WIRING DIAGRAM

Refer to A-TRAC Indicator Light Remains ON (See page ).

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.

(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.

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

2.	INSPECT TRACTION CONTROL SWITCH (A-TRAC SWITCH)

REPLACE TRACTION CONTROL SWITCH (A-TRAC SWITCH)

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	READ VALUE USING TECHSTREAM (A-TRAC INDICATOR LIGHT)

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

REPLACE MASTER CYLINDER SOLENOID

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