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Originally Posted by chuck's
From reading a service manual,there is a clutch pack in which the encoder motor is connected to via internal linkage.With the slippage of rear wheel,the 4x4 module senses the slippage and then will send electrical power to the encoder motor.Via the internal linkage,the clutch pack gets proportionally engagaged to power the front drive shaft.It doesn't lock the clutch pack fully as if in full time 4x4.One drive shaft will turn faster than the other if alot of engine power is applied.I hope this helps to give you a better understanding how it works.
chuck's
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In auto 4x4 the pcm controls the 4x4... there are 3 sensors... 2 front one rear...
when the pcm sees different speed sensor input the transfer case encoder engages....this should happen very quickly if not you may have what this vehicle owner has happening.... there is not much slippage if any....when my vehicle locks in 4x4 and this does happen on dry ground as i may rotate tires when i put vehicle back down and turn the steering wheel to pull out of my driveway the wheels are jumping because they are all locked ...........the vehicle will shake and leave skid marks on pavement...
this is not proportionally engaged....also it takes more non slippage sensed to release 4x4 than engagement of 4x4........
if it takes too long for engagement or there is slippage transfer case is in need of repair.......
it does not apply more or less 4x4 depending on how much the wheels slipping.....