System Description
- Wheel spin status of drive wheel is detected by wheel sensor of four wheels. Engine output and transmission shift status is controlled so that slip rate of drive wheels is in appropriate level. When wheel spin occurs on drive wheel, ABS actuator and electric unit (control unit) perform brake force control of LH and RH drive wheels (apply brake force by increasing brake fluid pressure of drive wheel) and decrease engine torque by engine torque control. Wheel spin amount decreases. Engine torque is controlled to appropriate level.
- TCS function can be switched to non-operational status (OFF) by operating VDC OFF switch. In this case, VDC OFF indicator lamp turns ON.
- TCS function will not operate when 4WD mode is in "4LO".
- SLIP indicator lamp is blinking while TCS function is in operation and indicates to the driver that the function is in operation.
- Slight vibrations are felt on the brake pedal and the operation noises occur, when TCS function operates. This is not a malfunction because it is caused by TCS function that is normally operated.
- CONSULT can be used to diagnose the system diagnosis.
- Fail-safe function is adopted. When a malfunction occurs in TCS function, the control is suspended for VDC function and TCS function. The vehicle status becomes the same as models without VDC function and TCS function. However, ABS function, BLSD and EBD function are operated normally. Refer to Fail-safe .
SYSTEM DIAGRAM
INPUT AND OUTPUT SIGNALS
Major signal transmission between each unit via communication lines is shown in the following table:
| Component | Signal description |
|---|---|
| Yaw rate/side/decel G sensor | Mainly transmits the following signals to ABS actuator and electric unit (control unit) via communication line*1:
|
| ECM | Mainly transmits the following signals to ABS actuator and electric unit (control unit) via CAN communication:
Mainly receives the following signal from ABS actuator and electric unit (control unit) via CAN communication:
|
| TCM | Mainly transmits the shift position signal to ABS actuator and electric unit (control unit) via CAN communication. |
| Transfer control unit *2 | Mainly transmits the current 4WD mode signal to ABS actuator and electric unit (control unit) via CAN communication. |
| Steering angle sensor | Mainly transmits the steering angle sensor signal to ABS actuator and electric unit (control unit) via CAN communication. |
| Combination meter | Mainly receives the following signals from ABS actuator and electric unit (control unit) via CAN communication:
|
*1: Communication line between yaw rate/side/decel G sensor and ABS actuator and electric unit (control unit)
*2: Models with 4WD