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:

Multi-terrain Select Indicator Light does not Come ON
DESCRIPTION When the ON/OFF switch of the multi-terrain select switch is turned on, multi-terrain select control is enabled and the multi-terrain select indicator light illuminates. After selecting a road surface type using the mode selector switch of the ...

Transmitter ID not Received in Main Mode (C2126/26)
DESCRIPTION After all IDs are registered, DTC C2126/26 is stored in the tire pressure warning ECU and the tire pressure warning light blinks for 1 minute and then comes on. When the tire pressure warning ECU successfully receives information from all the ...