Vehicle Stability Control System

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: PRECAUTION

1. TROUBLESHOOTING PRECAUTIONS

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

(b) 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 them before disconnecting each connector or removing and installing parts.

(c) Since the system may be influenced by malfunctions in systems other than the VSC system, be sure to check for DTCs in other systems.

2. HANDLING PRECAUTIONS

(a) Do not remove or install VSC parts such as the steering angle sensor or yaw rate and acceleration sensor except when necessary, as they must be calibrated after removal or installation.

(b) 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 VSC system.

(c) Be sure to remove and install the ECU, brake actuator and each sensor, etc. with the engine switch off unless it is specified in the inspection procedure.

(d) 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 the Techstream, and also check that system functions and signals received by the ECU are normal using Test Mode.

3. DTC PRECAUTION

(a) Warnings for some DTCs will not be cleared by just replacing the defective parts. If a warning is still displayed after completing a repair, turn the engine switch off before beginning the procedure for clearing DTCs.

NOTICE:
If a part is still malfunctioning even after the DTC is cleared, the DTC will be stored again.

4. CHASSIS DYNAMOMETER PRECAUTION

(a) Enter Test Mode to disable TRAC and VSC control when using a chassis dynamometer Service Precautions.

HINT
* The vehicle may unexpectedly move off of the dynamometer because of TRAC and VSC operation.
* Pressing the VSC OFF switch does not disable TRAC and VSC operation completely.

NOTICE:
* Make sure that the slip indicator light is blinking (Test Mode is activated).
* Secure the vehicle with lock chains for safety.

5. CAN COMMUNICATION SYSTEM PRECAUTIONS

(a) The CAN communication system is used for data communication between the skid control ECU, the steering angle sensor, the yaw rate sensor (acceleration sensor included) and other ECUs. If there are any problems in the CAN communication lines, corresponding DTCs for the communication lines are output.

(b) If any CAN communication line DTCs are output, repair the malfunction in the communication lines and troubleshoot the VSC system after data communication becomes normal.

(c) 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.