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

AUTO LSD Indicator Light does not Come ON

DESCRIPTION The AUTO LSD does not operate even if the VSC OFF switch is pressed under the following conditions: The brake system is faulty. The temperature inside the hydraulic brake bo ...

TC and CG Terminal Circuit

DESCRIPTION DTC output mode is set by connecting terminals TC and CG of the DLC3. WIRING DIAGRAM HINT: When each warning light continues blinking, a ground short in the wiring of terminal TC o ...

Other materials about Toyota 4Runner:

Light Sensor Circuit Malfunction (B1244)
DESCRIPTION The automatic light control sensor detects ambient light, converts it into an electrical signal, and outputs it to the main body ECU. The main body ECU turns on or off the headlights and taillights according to the signal. DTC Code ...

Freeze Frame Data
FREEZE FRAME DATA 1. CHECK FREEZE FRAME DATA (a) Connect the Techstream to the DLC3. (b) Turn the ignition switch to ON. (c) Turn the Techstream on. (d) Enter the following menus: Body Electrical / Navigation System / Trouble Codes. (e) Select a DTC to ...