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(2) Vacuum System Related to 4WD
During 2WD mode, the vacuum pressure
from vacuum pump is continuously
transmitted to the locking hub system.
This vacuum pressure pulls in the locking
hub actuator so that it will not be engaged
with the front end hub gear.
In 4WD mode, the TCCU blocks the
transferring of vacuum pressure from
vacuum pump to locking hub by supplying
the power to solenoid valve.
Engaged with gear
(expansion)
The vacuum pressure is released from the
hub actuator. At this time, the front hub end
gear is engaged.
Check valve
This valve allows the vacuum pressure to
flow through it in only one direction. This
prevent the vacuum from abruptly
releasing due to faulty vacuum pump.
Vacuum solenoid valve
Block the vacuum pressure
To atmosphere
Hub actuator (LH)
Disengaged from gear
2WD (applying vacuum pressure to hub
actuator) The vacuum pressure pulls in the
locking hub actuator so that it will not be
engaged with the front end hub gear.
3240-01
Hub actuator (RH)
(contraction)
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