Vehicle Stability Control System (for ADVICS Made)
BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM (for ADVICS Made): PRECAUTION
1. EXPRESSIONS OF IGNITION SWITCH
The type of ignition switch used on this model differs according to the specifications of the vehicle.
The expressions listed in the table below are used in this section.
2. TROUBLESHOOTING PRECAUTIONS
(a) 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.
(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 it before disconnecting each connector or removing and installing parts.
(c) 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.
3. HANDLING PRECAUTIONS
(a) Do not remove or install VSC parts such as the steering angle sensor or yaw rate sensor (acceleration sensor included) except when required, as they cannot be adjusted correctly after removal or installation.
(b) 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 VSC system.
(c) Be sure to remove and install the brake actuator assembly, sensors, etc. with the ignition switch off unless otherwise 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, also check that system functions and signals received by the ECU are normal using Test Mode.
4. DTC PRECAUTION
(a) 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 ignition switch off.
NOTICE:
If a part is still malfunctioning even after the DTC is cleared, the DTC will be stored again.
5. CHASSIS DYNAMOMETER PRECAUTION
When testing with a 2-wheel drum tester such as a speedometer tester, a combination tester for the speedometer and brake, a chassis dynamometer, or when jacking up the front wheels and turning the wheels, perform the following procedure to enter the Inspection Mode and stop the TRAC and VSC systems.
Enter Inspection Mode to disable TRAC and VSC control when using a chassis dynamometer.
HINT
The vehicle may move unexpectedly out of the dynamometer because of TRAC and VSC operations.
NOTICE:
* Secure the vehicle with a lock chain for safety.
* When performing procedures related to VSC OFF switch operation, make sure that the mode is VSC OFF mode.
(a) Activating Inspection Mode (When Using the Techstream)
(1) Ensure that the ignition switch is off and the engine is stopped.
(2) Make sure that the shift lever is in P.
(3) Connect the Techstream to the DLC3.
(4) Start the engine.
(5) Turn the Techstream on.
(6) Enter the following menus: Chassis / ABS/VSC/TRAC / Utility / Inspection Mode.
(7) Check that the TRAC OFF indicator and VSC OFF indicator light will come on.
HINT
If the TRAC OFF indicator or VSC OFF indicator lights does not come on, repeat the steps.
(8) Turn the ignition switch off.
HINT
Turning the ignition switch off ends Inspection Mode.
(b) Activating Inspection Mode (When not Using the Techstream)
HINT
Perform steps from "D" to "H" within 30 seconds.
(1) Ensure that the ignition switch is off and the engine is stopped (Step "A").
(2) Make sure that the shift lever is in P (Step "B").
(3) Start the engine (Step "C").
(4) Apply parking brake by depressing the parking brake pedal (Step "D").
(5) Depress and release the brake pedal twice (Step "E").
(6) Depress and hold the brake pedal down, then release and apply parking brake twice (Step "F").
(7) With parking brake applied, depress and release the brake pedal twice (Step "G").
(8) Check if the TRAC OFF indicator and VSC OFF indicator lights will come on (Step "H").
HINT
If the TRAC OFF indicator or VSC OFF indicator lights does not come on in step "H", repeat the steps from "A" to "H".
(9) Turn the ignition switch off.
HINT
Turning the ignition switch off ends Inspection Mode.
6. 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 is a malfunction in the CAN communication line, corresponding DTCs in the communication line are output.
(b) If the DTC in the CAN communication line is output, repair the malfunction in the communication line and troubleshoot the VSC system while data communication is 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.