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, yaw rate sensor signal, side G sensor signal and decel 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 drivability and safety on a slippery road surface.
- It transmits/receives each signal from the following AWD control unit via CAN communication line.
COMPONENTS FUNCTION CHART
| Component parts | Function |
|---|---|
| ABS actuator and electric unit (control unit) | Transmits the following signals via CAN communication to AWD control unit.
|
| ECM | Transmits the following signals via CAN communication to AWD control unit.
|
| Combination meter | Transmits conditions of parking brake switch signal via CAN communication to AWD control unit. |
Receives the following signals via CAN communication from AWD control unit.
|
|
| Steering angle sensor | Transmits conditions of steering angle sensor signal via CAN communication to AWD control unit. |
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.
NOTE:
Light tight-corner braking symptom may occur depending on driving condition in AUTO mode. This is not malfunction.
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. If vehicle speed then decreases, the vehicle automatically returns to direct 4-wheel driving conditions. The AWD LOCK indicator lamp keeps illuminating.
- LOCK mode will change to AUTO mode automatically, when the vehicle has been driven at a high speed. The AWD LOCK indicator lamp turns off.
- LOCK mode will change to AUTO mode automatically, when the ignition switch is turned "OFF".
NOTE:
- Every time AWD LOCK switch is pressed, AUTO mode and LOCK mode switch each other.
- If there is a significant difference in pressure or wear between tires, full vehicle performance is not available. Tire conditions are detected, and LOCK mode may be prohibited, or else speeds at which LOCK mode is enabled may be restricted.
- Heavy tight-corner braking symptom occurs when vehicle is driven in the following conditions: LOCK mode, steering wheel is turned fully to either sides, and accelerator pedal is depressed.
CAUTION:
Never switch to LOCK when rotation speed of front and rear wheel differs.