GENERAL INFORMATION
- Electronic control AWD has been adopted to ensure the on-road performance, achieve lighter and smaller body, and realize better fuel economy.
- The electronic control AWD controls the torque of the electronic control coupling located between the propeller shaft and rear differential. This strategy is enabled by varying the torque distribution to the front and rear wheels from the status closer to the front wheel drive to the status closer to the direct coupling AWD and realizes the optimal drive force according to the various driving conditions.
OPERATION
If the vehicle is driven with a tire with incorrect diameter (high-pressure type spare tire or flat tire) installed to either wheel in the AWD mode, AWD-ECU controls the coupling in high torque. If this is the case, the coupling temperature may rise to cause a seizure.
The current flowing the coupling coil is monitored, and if it exceeds the specified value, the system is deactivated.
If the current flowing the electronic control coupling solenoid coil is larger than the command value from AWD-ECU, the system is deactivated.
If the current flowing in the electronic control coupling solenoid coil is smaller than the command value from AWD-ECU, the system is deactivated.
If AWD-ECU determines that the vehicle is used under some severe operational conditions (such as a long-time driving in AWD on a sandy road, slushy road or road with deep snows or towing or long hill-climbing), AWD-ECU detects the overload to the coupling. If abnormal overload is detected, AWD-ECU interrupts the system to prevent it from being damaged.
Due to the drive mode selector failure, the drive mode is incognizable, AWD-ECU detects the drive mode selector internal circuit failure, and flashes the AWD/LOCK indicators.
AWD-ECU detects a power supply voltage abnormal drop, and if any abnormality occurs, it interrupts the system.
AWD-ECU detects a power supply voltage abnormal increase, and if any abnormality occurs, it interrupts the system.
AWD-ECU detects an IG1 power supply voltage abnormal drop, and if any abnormality occurs, it interrupts the system.
AWD-ECU detects an IG1 power supply voltage abnormal increase, and if any abnormality occurs, it interrupts the system.
- AWD-ECU detects a power supply voltage abnormal drop, and if any abnormality occurs, it interrupts the system.
- If any abnormality occurs in the AWD-ECU, the system is deactivated.
AWD-ECU detects a power supply voltage abnormality, and if any abnormality occurs, it interrupts the system.
AWD-ECU monitors the coupling solenoid wiring harness abnormality and AWD-ECU internal error, and if any abnormality occurs, it deactivates the system.
AWD-ECU monitors the CAN C-bus off interruption, and if any abnormality occurs, it interrupts the system.
AWD-ECU temporarily limits the AWD functions if it has not received the signal from the engine control module.
AWD-ECU receives the data (such as ABS sensor signal, ABS operation signal) via the CAN bus lines. If it cannot receive such data, it interrupts the system.
AWD-ECU receives the data (such as drive mode display signal, failure information signal) from ETACS-ECU via the CAN bus lines. If it cannot receive such data, illuminates the AWD indicator.
AWD-ECU temporarily limits the AWD functions if an abnormality in the throttle opening angle signal is detected.
AWD-ECU receives the data (such as wheel speed sensor signal) from ABS/ASC-ECU via the CAN bus lines. If it detects malfunction of the wheel speed signal, it interrupts the system.
AWD-ECU receives the data (such as ABS sensor signal, ABS operation signal) via the CAN bus lines. If it cannot receive such data, it interrupts the system.
AWD-ECU receives the vehicle information stored in the ETACS-ECU via CAN bus lines.