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). PARTS FUNCTION CHART 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). PARTS FUNCTION CHART 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 |
PARTS FUNCTION CHART
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 (1) | " DESCRIPTION " |
| Yaw rate/side/decel G sensor (1) | " DESCRIPTION " |
| (1) With VDC | |
| (1) | With VDC |
PARTS FUNCTION CHART
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-III to check operation of actuator.
Test Item
| Test item | Condition | Description |
|---|---|---|
| ETS S/V (Detects AWD solenoid) | Vehicle stopped Engine running No DTC detected | Change command current value to AWD solenoid, and then change driving mode. (Monitor value is normal if it is within approximately ±10% of command value.) Qu: Increase current value in increments of 0.2 A Qd: Decrease current value in increments of 0.2 A UP: Increase current value in increments of 0.02 A DOWN: Decrease current value in increments of 0.02 A |
TEST ITEM CHART
| CAUTION | Never energize continuously for a long time. |
- Controls driving force distribution by signals from each sensor from front wheel driving mode (100:0) to 4- wheel driving mode (50:50) (without VDC).
- Controls driving force distribution by signals from ABS actuator and electric unit (control unit) from front-wheel driving mode (100:0) to 4-wheel driving mode (50:50) (with VDC).
- 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 (without VDC). Vehicle speed signal Stop lamp switch signal (brake signal)
- Transmits AWD solenoid signal via AWD communication to AWD control unit (with VDC).
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 (without VDC) or ABS actuator and electric unit (control unit) (with VDC).
- Accelerator pedal position signal
- Engine speed signal
- AWD communication transmits and receives signals between control units (ABS control unit to AWD control unit) connected with a dedicated line (single line).
- 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
- AWD communication transmits and receives signals between control units (ABS control unit to AWD control unit) connected with a dedicated line (single line).
- 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
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 transmits/receives data but selectively reads required data only. Refer to " CAN COMMUNICATION SIGNAL CHART ".
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 transmits/receives data but selectively reads required data only. Refer to " CAN COMMUNICATION SIGNAL CHART ".
Supplies power to AWD control unit.
Note. AWD system of vehicle with VDC shares various controls with ABS actuator and electric unit (control unit). Therefore, checking power supply and ground earth circuit is required.
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 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 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.
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.
OPERATION PROCEDURE
- Connect both battery cables. NOTE: Supply power using jumper cables if battery is discharged.
- Use the Intelligent Key or mechanical key to turn the ignition switch to the "ACC" position. At this time, the steering lock will be released.
- Disconnect both battery cables. The steering lock will remain released and the steering wheel can be rotated.
- Perform the necessary repair operation.
- When the repair work is completed, return the ignition switch to the "LOCK" position before connecting the battery cables. (At this time, the steering lock mechanism will engage.)
- Perform a self-diagnosis check of all control units using CONSULT-III.
- Connect both battery cables. NOTE: Supply power using jumper cables if battery is discharged.
- Use the Intelligent Key or mechanical key to turn the ignition switch to the "ACC" position. At this time, the steering lock will be released.
- Disconnect both battery cables. The steering lock will remain released and the steering wheel can be rotated.
- Perform the necessary repair operation.
- When the repair work is completed, return the ignition switch to the "LOCK" position before connecting the battery cables. (At this time, the steering lock mechanism will engage.)
- Perform a self-diagnosis check of all control units using CONSULT-III.