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DLN-16 < SYSTEM DESCRIPTION > [TRANSFER: TY21C] SYSTEM 4WD SYSTEM : Control in Each Mode INFOID:0000000010755232 2WD MODE • Vehicle is in front-wheel drive. CAUTION: If front wheels are slipping in 2WD mode, do not switch to AUTO or LOCK. This can cause difficulties AUTO MODE • Electronic control allows optimal distribution of torque to front/rear wheels to match road conditions. rear wheels changes automatically between approximately 100 : 0 (2WD) and 50 : 50 (4WD) to have an opti- • Sensor inputs determine the vehicle's turning condition, and tight cornering/braking are controlled by distrib- uting optimum torque to rear wheels. Vehicle Starts Control • At the start, torque distribution for front and rear wheels is fixed by electric control and stable start is achieved. • Makes possible stable driving, with no wheel spin, on snowy roads or other slippery surfaces. Normal Control • On roads which do not require 4WD, it contributes to improved fuel economy by driving in conditions close to front-wheel drive and it results in better fuel efficiency. • When spin occurs on front wheel, distribute optimum torque to rear wheel and keep stable driving. distributed to rear wheels for preventing tight cornering/braking symptom. LOCK MODE • Front/rear wheel torque distribution is fixed, ensuring stable driving when climbing slopes. the driving torque distribution of front and rear wheels is fixed to obtain the 4WD status of approximately 50 : • LOCK mode will change to AUTO mode automatically, when the vehicle has been driven at a high speed. Then LOCK mode control is canceled and the LOCK indicator lamp turns off. • When vehicle speed exceeds the specified speed, the mode cannot be switched from AUTO mode to LOCK mode. • LOCK mode will change to AUTO mode automatically, when the ignition switch is turned OFF in LOCK mode. NOTE: ABS actuator and electric unit (control unit) Mainly transmits the following signals to 4WD control unit via CAN communication. ECM Mainly transmits the following signals to 4WD control unit via CAN communication. TCM Mainly transmits the following signals to 4WD control unit via CAN communication. Component parts Signal item |