4x4 CONTROL SYSTEM OPERATION [WL-C, WE-C (AT)]
id0318d7165000
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Note
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• Shifting from 2H to 4H or 4H to 2H can be performed whether the vehicle is stopped or driving.
2H to 4H Selection
• When the 4x4 switch is switched from 2H to 4H, the clutch coil and motor in the transfer operate, the lockup shift fork slides to establish the 4H condition and the RFW unit locks automatically. At this time, the 4x4 indicator light illuminates to inform the driver that the vehicle is in four-wheel-drive mode.
4H to 2H Selection
• When the 4x4 switch is switched from 4H to 2H, the clutch coil in the transfer stops operation but the motor operates to slide the lockup shift fork and establish the 2H condition. Also, the RFW unit unlocks automatically. At this time, the 4x4 indicator light turns off to inform the driver that the vehicle is in 4x2 mode.
4H to 4L Selection
• Shifting from 4H to 4L can be performed only when the vehicle is stopped with the selector lever in the N position. When the 4x4 switch is switched from 4H to 4L, the motor in the transfer operates and the reduction shift fork slides to establish the 4L condition. At this time, the RFW unit remains locked and the 4x4 indicator light remains illuminated and, in addition, the 4L indicator light illuminates.
4L to 4H Selection
• Shifting from 4L to 4H can be performed only when the vehicle is stopped with the selector lever in the N position. When the 4x4 switch is switched from 4L to 4H, the motor in the transfer operates and the reduction shift fork slides to establish the 4H condition. At this time, the RFW unit remains locked and the 4x4 indicator light remains illuminated, but the 4L indicator light turns off.
Remote Freewheel Unit: FREE
• The RFW actuator pulls the sleeve away from the front differential output shaft, allowing the front differential to rotate freely.
The rotation of the right front tire is absorbed by the front differential, with the result that the ring gear, drive pinion gear, and front propeller shaft do not turn.
Remote Freewheel Unit: LOCK
• The RFW actuator pushes the sleeve over the output shaft, and the front differential output shaft and joint shaft are coupled together.
If the sleeve and the output shaft are not aligned when actuated, the RFW actuator applies pressure to the sleeve unit it can slide into place.
The rotation of the front propeller shaft is then transferred, via the front differential, to the front tires, and four-wheel-drive operation is possible.
2H to 4H Selection
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Part name
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Input
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Output
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RFW actuator Position
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Condition
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Digital TR sensor
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4x4 switch
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Speed sensor
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Lock solenoid
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Free solenoid
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Motor component
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Clutch coil
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4x4 indicator light
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4L indicator light
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2H
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-
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2H
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-
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OFF
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ON
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2H
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OFF
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OFF
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OFF
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Free
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4H
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-
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4H
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-
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ON
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OFF
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4H
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ON
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ON
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OFF
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Lock
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• When the 4x4 switch is switched from 2H to 4H, the clutch coil and motor in the transfer operate, the lockup shift fork slides to establish the 4H condition and the RFW unit locks automatically. At this time, the 4x4 indicator light illuminates to inform the driver that the vehicle is in four-wheel-drive mode.
4H to 2H Selection
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Part name
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Input
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Output
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RFW actuator Position
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Condition
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Digital TR sensor
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4x4 switch
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Speed sensor
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Lock solenoid
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Free solenoid
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Motor component
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Clutch coil
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4x4 indicator light
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4L indicator light
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4H
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-
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4H
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-
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ON
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OFF
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4H
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ON
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ON
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OFF
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Lock
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2H
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-
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2H
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-
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OFF
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ON
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2H
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OFF
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OFF
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OFF
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Free
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• When the 4x4 switch is switched from 4H to 2H, the clutch coil in the transfer stops operation but the motor operates to slide the lockup shift fork and establish the 2H condition. Also, the RFW unit unlocks automatically. At this time, the 4x4 indicator light turns off to inform the driver that the vehicle is in 4x2 mode.
4H to 4L Selection
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Part name
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Input
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Output
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RFW actuator Position
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Condition
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Digital TR sensor
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4x4 switch
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Speed sensor
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Lock solenoid
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Free solenoid
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Motor component
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Clutch coil
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4x4 indicator light
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4L indicator light
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4H
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N
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4H
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vehicle stop
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ON
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OFF
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4H
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ON
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ON
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OFF
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Lock
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4L
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N
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4L
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vehicle stop
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ON
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OFF
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4L
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ON
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ON
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ON
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Lock
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• Shifting from 4H to 4L can be performed only when the vehicle is stopped with the selector lever in the N position. When the 4x4 switch is switched from 4H to 4L, the motor in the transfer operates and the reduction shift fork slides to establish the 4L condition. At this time, the RFW unit remains locked and the 4x4 indicator light remains illuminated and, in addition, the 4L indicator light illuminates.
4L to 4H Selection
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Part name
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Input
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Output
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RFW actuator Position
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Condition
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Digital TR sensor
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4x4 switch
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Speed sensor
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Lock solenoid
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Free solenoid
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Motor component
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Clutch coil
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4x4 indicator light
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4L indicator light
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4L
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N
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4L
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vehicle stop
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ON
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OFF
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4L
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ON
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ON
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ON
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Lock
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4H
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N
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4H
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vehicle stop
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ON
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OFF
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4H
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ON
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ON
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OFF
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Lock
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• Shifting from 4L to 4H can be performed only when the vehicle is stopped with the selector lever in the N position. When the 4x4 switch is switched from 4L to 4H, the motor in the transfer operates and the reduction shift fork slides to establish the 4H condition. At this time, the RFW unit remains locked and the 4x4 indicator light remains illuminated, but the 4L indicator light turns off.
