- 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.
- 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.
- 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.
- Do not remove or install Electronically Controlled Brake parts such as the steering angle sensor, yaw rate sensor (acceleration sensor included) or brake pedal stroke sensor except when required, as they cannot be adjusted correctly after removal or installation.
- Be sure to perform preparation before work and confirmation after work is completed by following the direction in the repair manual when working on the Electronically Controlled Brake system.
- Be sure to remove and install the ECU, actuator, each sensor, etc. with the power switch off unless it is not specified in the inspection procedure.
- Be sure to remove the 2 main relays before removal and installation, or replacement of the Electronically Controlled Brake parts.
The removal or installation of the actuator, master cylinder or stroke simulator as well as some other procedures can cause the fluid level to drop below the fluid reservoir port. If this happens when performing such work, be sure to remove the 2 motor relays until the bleeding of the air in the pipeline is completed.
NOTEWhen the pump motor is operated with the air in the brake actuator hose, bleeding the air becomes difficult due to air in the actuator.
NOTEThe skid control ECU may operate the stroke simulator and drive the pump motor even when the power switch is off.
NOTEWith the power switch off, the skid control ECU can be operated for 2 minutes after the brake operation is finished.
Removal of the main relay and motor relay.
Wait for 2 minutes after turning the power switch off, stopping the brake pedal operation and closing the driver door before removing the 2 relays.
NOTEThe above situation occurs when the pump motor operates to prepare for the next operation just before the brake control system turns off.
- Wait for 2 minutes after turning the power switch off, stopping the brake pedal operation and closing the driver door before removing the 2 relays.
- If the ECU, brake actuator, 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 Techstream, also check that system functions and signals received by the ECU are normal using Test Mode.
Warnings for some DTCs cannot be cleared only by repairing the malfunctioning parts. If the warning is displayed after repair work, the DTC should be cleared after turning the power switch off.
NOTEIf a DTC for a malfunctioning part reappears after it was cleared, then it has been stored again.
Chassis Dynamometer Precaution
Enter Test Mode to disable TRAC and VSC control when using a chassis dynamometer.
NOTEThe vehicle may move unexpectedly out of the dynamometer because of TRAC and VSC operations.
NOTEMake sure that the brake control warning and SLIP indicator lights blink (Test Mode is achieved).
NOTESecure the vehicle with the lock chain for safety.
Brake Tester Precaution
- When inspecting the brakes using the brake tester, the braking force of the rear wheels maybe reduced.
- When the vehicle speed is 0 km/h (0 mph), the brake system of the vehicle limits the rear brake fluid pressure to approximately 50% of the normal brake fluid pressure when driving the vehicle, in order to reduce energy consumption.
CAN Communication System Precautions
- The CAN communication system is used for the data communication between the skid control ECU, the steering angle sensor, the yaw rate sensor (acceleration sensor included) and other ECUs. If there is trouble in the CAN communication line, corresponding DTCs in the communication line are output.
- If the DTC in the CAN communication line is output, repair the malfunction in the communication line and troubleshoot the Electronically Controlled Brake system while data communication is normal.
- 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.