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dcjones13

Transfer Case Encoder Sensor

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im looking for directions on how to replace the transfer case encoder sensor. i have a 2006 silverado vortec max 1500. thanx...

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im looking for directions on how to replace the transfer case encoder sensor. i have a 2006 silverado vortec max 1500. thanx...

 

I replaced my transfer case encoder motor (EM) on a Chevy 2003 Suburban. It was easy, though daunting for a first-timer.

 

On my Burb, the front drive shaft had to be removed fist. Marked the drive shaft connection points on axel and T-Case for referance, to facilitate reinstallation. Removed all fasteners of the drive shaft from both ends and collapsed it while rotating on axis, to facilitate removal.

 

Disconnected wire harness leading to EM. Removed the bolts holding it in place.

 

To install the replacement EM: Had to determine if transfer case cam was in 2wd. To do this I assumed the replacement EM's cam-socket was set in 2wd position, then compared the transfer case cam position. My cam was off in 4WD, so I raised the Burb's wheels off the ground, started up the engine, then using a vise-grip® plier, positioned the T-case's cam to what appeared neutral (2wd) position.

 

...Then turned off the engine. Removed the vise grip, without disturbing the cam's position. The cam could not be adjusted without the engine running.

 

Now I installed the replacement EM, bolted it in place, reconnected the wire harness. With all wheels still raised off the ground, I started the engine and tested 4wd button functionality; then tested the gear selector, while keeping a foot on the brakes. All worked out A1.

 

I shut down the engine and then reinstalled the front drive shaft, knowing that the encoder was working.

 

CAUTION, DISCLAIMER: PROCEED AT YOUR OWN RISK.

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post-50856-1286084677_thumb.jpg

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To install the replacement EM: Had to determine if transfer case cam was in 2wd. To do this I assumed the replacement EM's cam-socket was set in 2wd position, then compared the transfer case cam position. My cam was off in 4WD, so I raised the Burb's wheels off the ground, started up the engine, then using a vise-grip® plier, positioned the T-case's cam to what appeared neutral (2wd) position.

 

...Then turned off the engine. Removed the vise grip, without disturbing the cam's position. The cam could not be adjusted without the engine running.

 

 

 

 

I am doing this now. the only thing is the truck is in 4-low. I removed the transfer case motor and didn't change anything and now they won't line up.

 

Just for clarification, with the truck running, should the truck be in neutral when adjusting the transfer case with the vise-grips?

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ok, i have the transfer case in neutral, but the encoder motor still does not lineup correctly so i can't put it on. (taken off the vehicle when in 4-lo)

 

anyone know of the best way to correct this issue?

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ok, i have the transfer case in neutral, but the encoder motor still does not lineup correctly so i can't put it on. (taken off the vehicle when in 4-lo)

 

anyone know of the best way to correct this issue?

 

 

 

Well the motor is on but it won't switch out of 4-low, no lights on the push button and the "service 4wd" is still showing up.

 

Anyone have any ideas at all?

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I kept mine in Park while engine was running, then aligned the cam splines to the relative position of the encoder.

 

If your EM is assumed to be set in 2wd, then adjust the cam on the Transfer Case to match.

 

Maybe your new EM is faulty? Hypothetically if one were to only plug in the EM to the wire harness (but not attach to TC) and attempt

operating the 2wd/4wd dash buttons, the EM should respond (its only a glorified servo).

 

The info from transmissiondigest may interest you, "Breaking The Code On Encoders".

Up_To_Stds_HTML_Encoders_4WD.pdf

Up_To_Stds_HTML_Encoders_4WD.pdf

Up_To_Stds_HTML_Encoders_4WD.pdf

Up_To_Stds_HTML_Encoders_4WD.pdf

Edited by BigSilver

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Well, it turns out you shouldn't connect the motor before it's completely attached.

 

That was my only issue.

 

I tested a working one on my broken truck and ended up making an investment in TWO motors ... oh brother.

 

All fixed and working GREAT! Thanks for your help.

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Well, it turns out you shouldn't connect the motor before it's completely attached.

 

That was my only issue.

 

I tested a working one on my broken truck and ended up making an investment in TWO motors ... oh brother.

 

All fixed and working GREAT! Thanks for your help.

 

I hope you saved the first EM unit? One could probably reset it.

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I am having an issue lining up the motor with the transfer case in my 2005 Chevy Suburban. The transfer case motor is 180 degrees out from the transfer case and the 4 button switch lights up in 4wd lo. After a few attempts at repositioning the encoder by connecting it to the wiring harness and pushing the button it will not move. I have disconnected the battery and pulled the 30 amp fuse in hopes that the system resets. Any advice on how to align the motor to the transfer case? Is there a way to trick the motor to reset it to another position? Any help would be greatly appreciated?

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