ELECTRONICALLY CONTROLLED BRAKE SYSTEM PRECAUTION

PRECAUTION FOR DISCONNECTING THE AUXILIARY BATTERY CABLE

TROUBLESHOOTING PRECAUTIONS

1. When there is a malfunction with terminal contact points or part installation problems, removal and installation of the suspected problem parts may return the system to the normal condition either completely or temporarily.

2. In order to determine the malfunctioning area, be sure to check the conditions at the time the malfunction occurred, such as DTC output and the Freeze Frame Data, and record it before disconnecting each connector or removing and installing parts.

3. Since the system may be influenced by malfunctions in systems other than the brake control system, be sure to check for DTCs in other systems.

HANDLING PRECAUTIONS

1. Do not remove or install electronically controlled brake system parts such as the steering angle sensor, yaw rate and acceleration sensor (airbag sensor assembly) or brake pedal stroke sensor assembly except when required, as they need to be adjusted correctly after removal and installation.

2. Be sure to perform preparation before work and confirmation after work is completed by following the directions in the repair manual when working on the electronically controlled brake system.

3. Be sure that the power switch is off when removing and installing the ECU, actuator, sensors, etc. unless it is otherwise specified in the inspection procedure.

4. If the brake booster with master cylinder assembly or a sensor has been removed and installed, it is necessary to check the system for problems after the parts have been reassembled. Check for DTCs using the Techstream, also check that system functions and signals received by the ECU are normal using Test Mode.

5. If the brake pedal is depressed before the brake control system is prepared to operate, the pedal stroke may seem unusually long or short. This is due to the fact the stroke simulator cut solenoid has not yet operated and is not a malfunction.

   After the power switch is turned on (IG) or the brake pedal is depressed twice or more, the stroke simulator will operate and the brake pedal stroke will remain consistent.

DTC PRECAUTION

1. Warnings for some DTCs cannot be cleared only by repairing the malfunctioning parts. If the warning is displayed even after repair work, the DTC should be cleared after turning the power switch off.

   Note

   If a DTC for a malfunctioning part reappears after it is cleared, then it has been stored again.

CHASSIS DYNAMOMETER PRECAUTION

1. Enter Inspection Mode to disable TR(A)C and VSC operation when using a chassis dynamometer Click here.

   Note

   
   

   • Make sure that the slip indicator light blinks (Inspection Mode is activated).

   • Secure the vehicle with lock chains for safety.

   • When performing procedures related to VSC OFF switch operation, make sure that the VSC has been disabled.

CAN COMMUNICATION SYSTEM PRECAUTIONS

1. The CAN communication system is used for communication between the skid control ECU (brake booster with master cylinder assembly), the steering angle sensor, yaw rate and acceleration sensor (airbag sensor assembly) and other ECUs. If any CAN communication DTCs are detected, DTCs corresponding to the malfunction will be output.

2. If any CAN communication DTCs are output, repair the malfunction and troubleshoot the VSC system while communication is normal.

3. In order to enable CAN communication, a specific type of wiring is used for the CAN communication lines. The wiring used for each communication line is a twisted pair of wires that have an equal length. A bypass wire should not be used, because the data being transmitted will be corrupted.