Vehicle Stability Control System Precaution

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.

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 each connector or removing and installing parts.

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

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.

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.

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.

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.

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

NOTICE:

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

Disable TRC and VSC when using a chassis dynamometer.

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:

   1. 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.
      
   2. 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 combination meter's VSC OFF indicator and SLIP indicator lights come on.
      
   3. Fix the vehicle in place with chains for safety.
      

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.

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.

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.