VEHICLE STABILITY CONTROL SYSTEM PRECAUTION


  1. EXPRESSIONS OF IGNITION SWITCH

    Tech Tips

    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.

    Expression Ignition Switch (position) Engine Switch (condition)
    Ignition switch off Off Off
    Ignition Switch ON ON On (IG)
    Ignition Switch ACC ACC On (ACC)
    Engine start START Start
  2. TROUBLESHOOTING PRECAUTIONS


    1. When there is a problem with terminal contact points or part installations, removal and installation of the suspected problem 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 stored DTCs and the Freeze Frame Data, and record them before disconnecting connectors 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 PRECAUTIONS


    1. 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.

    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 and each sensor, etc. with the ignition switch off unless otherwise specified in the inspection procedure.

    4. 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 intelligent tester, and also check that system functions and signals received by the ECU are normal using Test Mode.

  4. DTC PRECAUTION


    1. Some DTCs cannot be cleared only by repairing the malfunctioning parts. If a DTC is stored after repair work, turn the ignition switch off to clear the DTC.

      Note

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

  5. CHASSIS DYNAMOMETER PRECAUTION


    1. When testing with a drum tester such as a speedometer tester, a combination tester for the speedometer and brake, or a chassis dynamometer, enter Test Mode using the intelligent tester, or switch to VSC OFF mode to turn TRC and VSC operation off using the VSC OFF switch.

      CAUTION:


      • If the vehicle is tested in normal mode on the drum tester, TRC and VSC operation may cause the vehicle to jump out from the drum tester.

      • When switching to VSC OFF mode, the VSC OFF switch must be held for 3 seconds or more with the vehicle stopped. TRC and VSC operation must both be turned off before beginning testing. During VSC OFF mode, the TRC OFF indicator (multi-information display) and VSC OFF indicator light on the combination meter come on.

      • Fix the vehicle in place with chains for safety.

  6. CAN COMMUNICATION SYSTEM PRECAUTIONS


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

    2. If any CAN communication line DTC is output, repair the malfunction in the communication line and troubleshoot the VSC system after data communication becomes 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 of equal length. A bypass wire should not be used because the data being transmitted will be corrupted.