VEHICLE STABILITY CONTROL SYSTEM PRECAUTION


  1. PRECAUTION FOR DISCONNECTING CABLE FROM NEGATIVE BATTERY TERMINAL

    Note

    When disconnecting the cable from the negative (-) battery terminal, initialize the following system(s) after the cable is reconnected.

    System See Procedure
    Parking Assist Monitor System

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    Air Conditioning System

  2. TROUBLESHOOTING PRECAUTIONS


    1. 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 normal 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 Freeze Frame Data, and record it before disconnecting any connector or removing and installing parts.

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

  3. HANDLING PRECAUTION


    1. Do not remove or install VSC parts such as the steering angle sensor or yaw rate and acceleration sensor 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 VSC system.

    3. Be sure to remove and install the ECU, brake actuator assembly, sensors, etc. with the engine switch off unless it is otherwise specified in the inspection procedure.

    4. If the ECU, brake actuator 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 GTS. Also check that the system functions and signals received by the ECU are normal using Test Mode.

  4. DTC PRECAUTION


    1. 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 engine switch off.

      Note

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

    2. When 2 or more DTCs are detected, perform diagnosis for each DTC, one by one until the problem is identified.

  5. CHASSIS DYNAMOMETER PRECAUTION

    When testing with a 2-wheel drum tester such as a speedometer tester, combination tester for the speedometer and brakes, or chassis dynamometer, or when jacking up the front wheels and turning the wheels, perform the following procedure to enter Inspection Mode and disable the TRC and VSC systems.

    Note

    Secure the vehicle with lock chains for safety.

    Tech Tips


    • If Inspection Mode is not used, the vehicle may unexpectedly move off the dynamometer because of TRC and VSC operation.

    • The VSC OFF switch (combination switch assembly) must not be used to disable TRC and VSC operation when the vehicle is to be operated on a dynamometer. Pressing the VSC OFF switch (combination switch assembly) does not disable TRC and VSC operation completely.


    1. Activating Inspection Mode (When Using the GTS)


      1. Ensure that the engine switch is off and the engine is stopped.

      2. Connect the GTS to the DLC3.

      3. Turn the engine switch on (IG).

      4. Turn the GTS on.

      5. Enter the following menus: Chassis / ABS/VSC/TRC / Utility / Inspection Mode.


        Chassis > ABS/VSC/TRC > Utility
        Tester Display
        Inspection Mode

      6. Check that the VSC OFF and TRC OFF indicator lights come on.

        Tech Tips


        • If the VSC OFF and TRC OFF indicator lights do not come on, repeat the steps above.

        • Turning the engine switch off ends Inspection Mode.

    2. Activating Inspection Mode (When not Using the GTS)

      Tech Tips

      Perform steps "C" to "G" within 30 seconds.


      1. Ensure that the engine switch is off and the engine is stopped (Step "A").

      2. Release the parking brake (Step "B").

      3. With the brake pedal depressed, start the engine (Step "C").

      4. While holding the brake pedal down, apply the parking brake (Step "D").

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

      6. While holding the brake pedal down, 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 that the VSC OFF and TRC OFF indicator lights come on (Step "H").

        Tech Tips


        • If the VSC OFF and TRC OFF indicator lights do not come on in step "H", repeat steps "A" to "H".

        • Turning the engine switch off ends Inspection Mode.

  6. CAN COMMUNICATION SYSTEM PRECAUTIONS


    1. The CAN communication system is used for communication between the skid control ECU (brake actuator assembly), steering angle sensor, yaw rate and acceleration sensor and other ECUs. If there is trouble in a CAN communication line, corresponding DTCs in the communication line are output.

    2. If any CAN communication DTCs are output, repair the malfunction, then 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.