Looking for TCCM '93 Jimmy S-15

[wolf87ca]

Hello, still working out the kinks on some of the stuff i have posted recently, but part of on thing is i am trying to find the TCCM, i have looked under the passenger side kick panel, but im thinking it might be behind the glove box, is another location i have heard, but i took apart the whole glove box, and the access panel at the back of it, and there seems to be no simple way to get in behind it, am i going to have to actually take off the entire dash? or am i missing something?
Cheers

 

[Molson02536]

Hello, still working out the kinks on some of the stuff i have posted recently, but part of on thing is i am trying to find the TCCM, i have looked under the passenger side kick panel, but im thinking it might be behind the glove box, is another location i have heard, but i took apart the whole glove box, and the access panel at the back of it, and there seems to be no simple way to get in behind it, am i going to have to actually take off the entire dash? or am i missing something?
Cheers

Number 5 is the TCCM on your 93 Jimmy. http://www.compnine.com/index.php?u...delid=7018&capuid=1&majorgroup=04&grouptype=B

***HOW TO CHECK WHAT IS WRONG***

To read the codes for the 4x4 with electric shift transfer case, install a jumper wire from terminals "J" and "A" on the ALDL (12 pin connector under the driver's side dash)

The lights on the 4x4 indicator (switch) will flash in a pattern, there are only 4 codes, one flash is code one, 2 flashes is a code 2, and so on...

Code "1" is "RAM standby power" and is considered normal, may be caused by clearing the codes.
Code "2" is "Encoder fault"
Code "3" is "TCCM motor circuit"
Code "4" is "RAM/ROM failure"

If you have the codes 2 or 3 check all the encoder motor connections at the transfer case, if OK it will need a new encoder motor assembly.
If you have code 4, replace the TCCM.

Make sure all connections are good and no corrosion, and then it's either an encoder or TCCM.

***TO FIX THE TCCM***

The TCCM is located behind the glove box, and is accessed from underneath the dash. To remove, the kick panel and black cover come off. Then a 1/4" screw holds the "brains" in the dash. The middle computer is the Truck's brain, the one on the backside is the TCCM, and on the front is the small ABS computer. Simply loosen the 2 10mm nuts on each side, and they will separate.

Good luck and keep us posted.

 

[wolf87ca]

Number 5 is the TCCM on your 93 Jimmy. http://www.compnine.com/index.php?u...delid=7018&capuid=1&majorgroup=04&grouptype=B

***HOW TO CHECK WHAT IS WRONG***

To read the codes for the 4x4 with electric shift transfer case, install a jumper wire from terminals "J" and "A" on the ALDL (12 pin connector under the driver's side dash)

The lights on the 4x4 indicator (switch) will flash in a pattern, there are only 4 codes, one flash is code one, 2 flashes is a code 2, and so on...

Code "1" is "RAM standby power" and is considered normal, may be caused by clearing the codes.
Code "2" is "Encoder fault"
Code "3" is "TCCM motor circuit"
Code "4" is "RAM/ROM failure"

If you have the codes 2 or 3 check all the encoder motor connections at the transfer case, if OK it will need a new encoder motor assembly.
If you have code 4, replace the TCCM.

Make sure all connections are good and no corrosion, and then it's either an encoder or TCCM.

***TO FIX THE TCCM***

The TCCM is located behind the glove box, and is accessed from underneath the dash. To remove, the kick panel and black cover come off. Then a 1/4" screw holds the "brains" in the dash. The middle computer is the Truck's brain, the one on the backside is the TCCM, and on the front is the small ABS computer. Simply loosen the 2 10mm nuts on each side, and they will separate.

Good luck and keep us posted.

Alright, well i tried taking to fuse out for kicks yesterday, as i havent had a full chance to look it over yet, and leaving it out for the afternoon while at work, i was able to shift in and out twice before the Transfer Case quit again when i got home, also for the "J" pin, i am using this as a reference GM Troublecodes.net
there is no "j" on the image, so i assume by the pattern it seems to take that "J" would be directly under "C" anyways, just leaving work now so i will take a gander and get back to you.
Cheers,
Tyler

 

[wolf87ca]

so i checked, i have a code 2, little side note though, i took the fuse out while i was at work, for the tccm, the 5 amp in the fuse box under the steering column, and put it back in, was able to shift in and out of 4 hi/lo 2 hi before leaving, got home, and it was broken again, so perhaps its an electrical connection? as if it were my encoder motor, im assuming that would not have allowed me to shift at all, though im no expert. going to price out an encoder motor from the boneyard later though, have still yet to get at the TCCM, have checked the switch connections on the dash, they seem to be fine.
thanks for all the help by the way

 

[wolf87ca]

on an unrelated note, got any good how-tos on removing and replace the passenger side lower control arm? the bolt that holds the cup for my stabilizer bar bushings is snapped off in the hole, and drilling it out is not working so far, and i may just replace the lower control arm assembly... unless i manage to drill the bolt out.

 

[Molson02536]

on an unrelated note, got any good how-tos on removing and replace the passenger side lower control arm? the bolt that holds the cup for my stabilizer bar bushings is snapped off in the hole, and drilling it out is not working so far, and i may just replace the lower control arm assembly... unless i manage to drill the bolt out.

Cutting torch or a plasma cutter does wonders on taking bolts out.

 

[wolf87ca]

Cutting torch or a plasma cutter does wonders on taking bolts out.

i managed to solve this problem, i ended up welding the cup in place with new bushings, the old ones were quite worn, my handling is amazing and i barely feel the potholes around town in my front end, still have to take time to finish the transfer case repair though, working lots, replaced all my vacuum hoses recently and the Fuel pressure regulator.