A-TRAC Indicator Light does not Come ON

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM (for Hydraulic Brake Booster): A-TRAC Indicator Light does not Come ON
- 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 A-TRAC Indicator Light Remains ON.

INSPECTION PROCEDURE

NOTICE:
When replacing the skid control ECU (master cylinder solenoid), perform calibration Vehicle Stability Control System (for Hydraulic Brake Booster).

PROCEDURE

1. CHECK CAN COMMUNICATION LINE A-TRAC Indicator Light Remains ON

NG -- GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) How to Proceed With Troubleshooting
OK -- Continue to next step.

2. PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVE TRC Indicator) A-TRAC Indicator Light Remains ON

NG -- GO TO METER / GAUGE SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) How To Proceed With Troubleshooting
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (ATRC TERMINAL) A-TRAC Indicator Light Remains ON

NG -- INSPECT A-TRAC SWITCH

OK -- REPLACE MASTER CYLINDER SOLENOID Disassembly

4. INSPECT A-TRAC SWITCH A-TRAC Indicator Light Remains ON

NG -- REPLACE A-TRAC SWITCH Removal

OK -- REPAIR OR REPLACE HARNESS OR CONNECTOR