System Description: Description
- AWD controls distribution of drive power between front-wheel drive (100:0) and 4-wheel drive (50:50) conditions according to signals from sensors.
- By receiving the steering angle sensor signal and G sensor signal, vehicle with VDC corrects a torque distribution for front and rear wheels according to a driving operation and a behavior of the vehicle during cornering and improves driveability and safety on a slippery road surface.
- It transmits/receives each signal from the following AWD control unit via CAN communication line (without VDC).
Component parts Function ABS actuator and electric unit (control unit) Transmits the following signals via CAN communication to AWD control unit. - Vehicle speed signal
- Stop lamp switch signal (brake signal)
ECM Transmits the following signals via CAN communication to AWD control unit. - Accelerator pedal position signal
- Engine speed signal
Combination meter Transmits conditions of parking brake switch signal via CAN communication for AWD control unit. Receives the following signals via CAN communication to AWD control unit. - AWD warning lamp signal
- Mode lamp signal
- It transmits/receives each signal from the following ABS actuator and electric unit (control unit) control unit via CAN communication line (with VDC).
Component parts Function ECM Transmits the following signals via CAN communication to ABS actuator and electric unit (control unit). - Accelerator pedal position signal
- Engine speed signal
Combination meter Transmits conditions of parking brake switch signal via CAN communication for ABS actuator and electric unit (control unit). Receives the following signals via CAN communication to ABS actuator and electric unit (control unit). - AWD warning lamp signal
- Mode lamp signal
- It transmits/receives each signal from the following AWD control unit via AWD communication line (with VDC).
Component parts Function ABS actuator and electric unit (control unit) Transmits conditions of AWD solenoid signal via AWD communication for AWD control unit. Receives the following signals via AWD communication from AWD control unit. - AWD lock switch signal
- AWD solenoid monitor signal
AUTO Mode
- Electronic control allows optimal distribution of torque to front/rear wheels to match road conditions.
- AWD mode makes possible stable driving possible with no wheel spin, on snowy roads or other slippery surfaces.
- On roads which do not require 4-wheel drive, AUTO mode contributes to improved fuel economy by driving in conditions close to front-wheel drive.
- Sensor inputs determine the vehicle's turning condition, and tight cornering/braking are controlled by distributing optimum torque to rear wheels.
LOCK Mode
- Front/rear wheel torque distribution is fixed, ensuring stable driving when climbing slopes.
- Vehicle will switch automatically to AUTO mode if vehicle speed increases. Vehicle automatically returns to direct 4-wheel driving conditions if vehicle speed decreases.
NOTE:
If there is a significant difference in pressure or wear between tires, full vehicle performance is not available. LOCK mode may be prohibited, or speeds at which LOCK mode is enabled may be restricted according to the tire conditions.
CAUTION:
Never switch to LOCK when rotation speed of front and rear wheel differs.
POWER TRANSFER DIAGRAM