Mechanics

01 R & R TCCM

2001 GMC Jimmy

2001 GMC Jimmy with a 4.3, 6 cylander 4wd. Picked up a new Transfer case control motor and I cannot remove due to the center bolt aligned with the front drive shaft. Any hints on getting shaft out of the way to remove bolt and replace control motor would be appreciated.
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Gb-amateur
February 24, 2007.




Ive done tons an really didnt have any probs that I can remember, you can always pull the shaft only five minutes, the job only calls fo.9 hrs, I am having a brain malfunction a the moment will egt back to you in the morning

jim

Tiny
CHEVYII
Feb 24, 2007.
Jim,

Thanks for the quick answer. I am a beginner car repair person and very frustrated on having the Jimmy up on jacks all weekend and unable to change out TCCM. You said simple to pull the shaft, what is involved and would you recommend a beginner try this procedure.

Tiny
Gb-amateur
Feb 26, 2007.
, have some faith in yourself, as a tech of 20yrs I have alot of tools and may have had made or bought a wrench to fitbut I dont think so, before you do pull the shaft look at the bolt really hard and make sure nothing will fit, wait are you looking at the right part, the encoder motor is on the left side of the transfer case, the only thing even close to the driveshaft is the motor housing which has no bolts, yours should have three bolts on the side, maybe im thinking you meant the torsion bar, I did one a few weeks back on a 99 same thing and it was out and in, in approx 15 minutes, let me know what you think and find
i was also sitting here wondering what exactly led you to the encoder motor? Usually when they go outthey will still make noise but not switch gears, I have pulled them apart and found out why, but if you have a different scenario let me knowyou are calling the encoder motor atccm, the tccm is the computer that controls the motor via the switch on the dash, I just want to make sure you are replacing the right part if you wouldnt mind telling me what happened

Tiny
CHEVYII
Feb 26, 2007.
This is the encoder motor


http://www.2carpros.com/forum/automotive_pictures/59481_600906_1.jpg


Tiny
CHEVYII
Feb 26, 2007.
This is the tccm


http://www.2carpros.com/forum/automotive_pictures/59481_0866_2_1.jpg


Tiny
CHEVYII
Feb 26, 2007.
I took the Jimmy in to the dealer to have them replace the secondary air pump that was causing the service engine light to come on. I also told them the brake light and the ABS lights intermittantly light up and stay on, and the milage is bad, around 15 MPG. They charged me over $800 for secondary air pump, some other part in there (valves?) And adding brake fluid and replacing brake pads, and cleaning fuel injector nozzles. Leaving dealership, service 4wd light, ABS and Brake lights all came on. Taking back to them they said there is $1800 more work needing done to shut off these lights. I found and replaced the ABS ECBM for $135 (they said over $1000), and a transfer case encoder motor that I assumed was the Transfer case motor on the case. If wrong, I believe that there is an electronic controller on the passenger side kick plate that should be much easier to replace. None of the push buttons light up after a brief flash when the enging is started. Thanks for your feedback.

Tiny
Gb-amateur
Feb 26, 2007.
I bought the encoder motor pictured, and the milage still is very bad 15.2 MPG.

Tiny
Gb-amateur
Feb 26, 2007.
You will need some help, have someone get in the truck turn the key and start hitting buttons while you check the encoder motor for noise, it should make some if just the motor is bad, aldo check the switch when the lights come on and look for a breif red light on the switch, here is how it works, when you turn the key the tccm cyles and blinks the lights on the switch, when you hit a button the signal goes through the switch to the tccm, and then to the encoder motor and on to the front diff switch telling it to lock the axles in,

check that and get back to me, these things are hard to diagnose sometimes and every part I spoke of goes bad on these trucks the switch is #1 the encoder mtr is #2 and the tccm is well known for failure
if you had a test light you could do the test above and pull the harness going into the encoder and check for power while the switches were being pushed, test light is a goo and inexpensive tool all beginners must have
let me know

jim
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Tiny
CHEVYII
Feb 26, 2007.
Thanks Jim, I will check these when I get home and report to you tomorrow.

Tiny
Gb-amateur
Feb 26, 2007.
Ok thanks

Tiny
CHEVYII
Feb 26, 2007.

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