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 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 them before disconnecting connectors 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 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 ECU, brake actuator and each sensor, etc. with the ignition switch off unless specified otherwise 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.

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

4. 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 the 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*1 or with the shift lever in Neutral*2.

(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 if combination meter's VSC OFF indicator and TRAC OFF indicator lights come on.

HINT
* If the combination meter's VSC OFF indicator and TRAC OFF indicator lights do not come on, repeat the steps.
* Turning the ignition switch off ends Inspection Mode.

(b) Activating Inspection Mode (When not using the Techstream)

HINT
Perform steps "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*1 or with the shift lever in Neutral*2 (Step "B").

(3) Start the engine (Step "C").

(4) Apply the parking brake by depressing the parking brake lever (Step "D").

(5) Depress and release the brake pedal twice (Step "E").

(6) Depress and hold the brake pedal down, then release and apply the parking brake twice (Step "F").

(7) With the parking brake applied, depress and release the brake pedal twice (Step "G").

(8) Check if combination meter's VSC OFF indicator and TRAC OFF indicator lights come on (Step "H").

HINT
* If the combination meter's VSC OFF indicator and TRAC OFF indicator lights do not come on in step "H", repeat the steps from "A" to "H".
* Turning the ignition switch off ends Inspection Mode.

* *1: for Automatic Transaxle

* *2: for Manual Transaxle

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 is trouble in the CAN communication line, corresponding communication line DTCs are output.

(b) If any CAN communication line DTC 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 of equal length. A bypass wire should not be used because the data being transmitted will be corrupted.