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 driveability and safety on a slippery road surface.
- It transmits/receives each signal from the following AWD control unit via CAN communication line.
| 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) Yaw rate sensor signal Side G sensor signal Decel G sensor 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 to AWD control unit. |
| Receives the following signals via CAN communication from AWD control unit. AWD warning lamp signal AWD LOCK indicator lamp signal | |
| Steering angle sensor | Transmits conditions of steering angle sensor signal via CAN communication to AWD control unit. |
Component Description
| Component parts | Reference/Function |
|---|---|
| AWD control unit | " DESCRIPTION " |
| Wheel sensors | " DESCRIPTION " |
| AWD solenoid | " DESCRIPTION " |
| Electric controlled coupling | Transmits driving force to rear final drive. |
| AWD warning lamp | " DESCRIPTION " |
| AWD LOCK indicator lamp | " DESCRIPTION " |
| AWD lock switch | " DESCRIPTION " |
| ABS actuator and electric unit (control unit) | " DESCRIPTION " |
| ECM | " DESCRIPTION " |
| Combination meter | " DESCRIPTION " |
| Steering angle sensor | " DESCRIPTION " |
ECU IDENTIFICATION
AWD control unit part number can be read.
Use this mode to determine and identify the details of a malfunction based on self-diagnostic results or data monitor. AWD control unit gives drive signal to actuator with receiving command from CONSULT to check operation of actuator.
- Controls driving force distribution by signals from each sensor from front wheel driving mode (100:0) to 4-wheel driving mode (50:50).
- Front wheel driving conditions is available by fail-safe function if malfunction is detected in AWD system.
- Transmits the following signals via CAN communication to AWD control unit. Vehicle speed signal Stop lamp switch signal (brake signal) Yaw rate sensor signal Side G sensor signal Decel G sensor signal
Controls electric controlled coupling by command current from AWD control unit.
AWD solenoid is supplied with voltage by the internal circuit of AWD control unit.
Transmits the following signals via CAN communication to AWD control unit.
- Accelerator pedal position signal
- Engine speed signal
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability. Many electronic control units are equipped onto a vehicle, and each control unit shares information and links with other control units during operation (not independent). In CAN communication, control units are connected with 2 communication lines (CAN-H line, CAN-L line) allowing a high rate of information transmission with less wiring. Each control unit communicate data but selectively reads required data only.
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability. Many electronic control units are equipped onto a vehicle, and each control unit shares information and links with other control units during operation (not independent). In CAN communication, control units are connected with 2 communication lines (CAN-H line, CAN-L line) allowing a high rate of information transmission with less wiring. Each control unit communicate data but selectively reads required data only.
Supplies power to AWD control unit.
Able to select AUTO or LOCK mode.
- Turns ON when there is a malfunction in AWD system. AWD warning lamp indicates the vehicle is in fail-safe mode and shifting to front-wheel drive or 4-wheel drive (rear-wheels still have some driving torque).
- Also turns ON when ignition switch is turned ON, for the purpose of lamp check. Turns OFF after the engine starts if system is normal.
The following is the indications of indicator lamp after the engine start.
AWD warning lamp does not turn ON when the ignition switch is turned to ON.
AWD warning lamp does not turn OFF several seconds after the engine started.
Heavy tight-corner braking symptom occurs when the vehicle is driven and the steering wheel is turned fully to either side after the engine is started.
Note. Light tight-corner braking symptom may occur depending on driving conditions. This is not malfunction.
Vehicle does not enter 4-wheel drive mode even though AWD warning lamp turned to OFF.
While driving, AWD warning lamp blinks 2 times in 1 second and it turns OFF after 1 minute.
- This symptom protects drivetrain parts when a heavy load is applied to the electric controlled coupling and multiple disc clutch temperature increases. Also, optional distribution of torque sometimes becomes rigid before lamp blinks quickly. Both cases are not malfunction.
- When this symptom occurs, stop vehicle and allow it to idle for some times. Blinking will stop and system will be restored.
AWD warning lamp blinks at approximately 2 seconds intervals while driving.