Precaution [09/2015 - 08/2016]

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. Before disconnecting a connector or removing and installing a component in order to narrow down the malfunctioning part, make sure to perform the following procedure.
   • Check for and record any DTCs and Freeze Frame Data that were stored around the time that the malfunction occurred.
   • If any open circuit DTCs related to intermittent (momentary interruptions) malfunctions are output, check the intermittent monitor.

     Refer to CHECK FOR INTERMITTENT PROBLEMS [09/2015 - 08/2019] 

   NOTE:

   Before disconnecting connectors or fuses, turn the engine switch off and wait 20 seconds or more*.

   1. *: Differs according to vehicle conditions
3. Since the system may be influenced by malfunctions in systems other than the vehicle stability control system, be sure to check for DTCs in other systems.

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 (for TFT Meter Type).
2. Do not remove or install VSC parts such as the steering angle sensor or yaw rate and acceleration sensor (airbag sensor assembly) except when required, as they need to be adjusted correctly after removal and installation (for Optitron Meter Type).
3. Be sure to perform preparation before work and confirmation after work is completed by following the directions in the repair information when working on the VSC system.
4. 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.
5. 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 Techstream. Also check that the system functions and signals received by the ECU are normal using Test Mode.

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.

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 TRAC and VSC systems.

HINT: 

• If Inspection Mode is not used, the vehicle may unexpectedly move off the dynamometer because of TRAC and VSC operation.
• The VSC OFF switch (combination switch assembly) must not be used to disable TRAC and VSC operation when the vehicle is to be operated on a dynamometer. Pressing the VSC OFF switch (combination switch assembly) does not disable TRAC and VSC operation completely.

1. Activating Inspection Mode (When Using the Techstream)
   1. Ensure that the engine switch is off and the engine is stopped.
   2. Connect the Techstream to the DLC3.
   3. Turn the engine switch on (IG).
   4. Turn the Techstream on.
   5. Enter the following menus: Chassis / ABS/VSC/TRAC/EPB / Utility / Inspection Mode.

      Chassis > ABS/VSC/TRAC/EPB > Utility 

      Tester Display
      Inspection Mode

   6. Check that the VSC OFF indicator light comes on and the TRAC OFF message will be displayed on the multi-information display.

      HINT: 

      • If the VSC OFF indicator light does not come on and the TRAC OFF message is not displayed on the multi-information display, repeat the steps above.
      • Turning the engine switch off ends Inspection Mode.
2. Activating Inspection Mode (When not Using the Techstream)

   HINT: 

   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 indicator light comes on and the TRAC OFF message is displayed on the multi-information display (Step "H").

      HINT: 

      • If the VSC OFF indicator light does not come on and the TRAC OFF message is not displayed on the multi-information display in step "H", repeat steps "A" to "H".
      • Turning the engine switch off ends Inspection Mode.

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.