System Description
System DescriptionELECTRIC CONTROLLED COUPLING
^ In response to command current from AWD control unit, control clutch pull-in force is generated at the electromagnet and torque is generated at the control clutch.
^ The cam operates in response to control clutch torque and applies pressure to main clutch.
^ Main clutch transmits torque from input shaft to output shaft, according to the amount of pressure.
^ The actual amount of torque transfer is determined by control current as shown.
AWD CONTROL UNIT
^ Controls distribution of drive power between rear-wheel drive (0:100) and AWD (50:50) conditions circuit according to signals from sensors.
AWD LOCK SWITCH
AUTO mode
^ Electronic control allows optimal distribution of torque to front/rear wheels to match road conditions.
^ Makes possible stable driving, with no wheel spin, on snowy roads or other slippery surfaces.
^ On roads which do not require AWD, it contributes to improved fuel economy by driving in conditions close to rear-wheel drive.
^ Sensors determine the vehicle's turning condition, and in response tight cornering/braking are controlled by distributing optimum torque to front wheels.
NOTE:
^ When driving in AUTO mode or LOCK mode, if there is a large difference between front and rear wheel speed which continues for a long time, oil temperature of drive system parts becomes too high and AWD warning lamp flashes rapidly. (When AWD warning lamp flashes, vehicle changes to rear-wheel drive conditions.)
^ When driving in AUTO mode, AWD warning lamp may flash slowly if there is a significant difference in diameter of the tires. At this time, vehicle performance is not fully available and cautious driving is required. (Continues until engine is turned OFF.)
^ If AWD warning lamp is flashing rapidly, stop vehicle and allow it to idle for some time. Flashing will stop and AUTO mode will be restored.
^ If the warning lamp flashes slowly during driving but remains OFF after engine is restarted, the system is normal. If it again flashes slowly after driving for some time, vehicle must be inspected.
^ When the difference of revolution speed between the front and rear wheel with AUTO mode the shift occasionally changes to LOCK mode automatically. This is not malfunction.
LOCK mode (AWD LOCK indicator lamp ON)
^ Front/rear wheel torque distribution is fixed, ensuring stable driving when climbing slopes.
^ When LOCK mode is selected, 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.
^ LOCK mode will change to AUTO mode automatically, when the vehicle speed exceeds approximately 30 km/h (19 MPH). The AWD LOCK indicator light keeps illuminating.
NOTE: 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.
AWD WARNING LAMP
Turns ON when there is a malfunction in AWD system. It indicates that fail-safe mode is engaged and vehicle change to rear-wheel drive or shifting driving force-AWD (Front-wheels still have some driving torque).
Also turns ON when ignition switch is turned ON, for purpose of bulb check. Turns OFF approximately for 1 seconds after the engine starts if system is normal.
AWD warning lamp indication