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1993 Chevy S10 4x4 Pickup

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Old 04-13-2011, 10:38 PM   #1
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1993 Chevy S10 4x4 Pickup

Where exactly is the tccm (transfer case control module) located at on my truck. i was told behind the glove box on the passenger side of my truck, but i was wondering how much work is it to actually replace it? what do i have to take off to get to it and replace it?
Old 04-14-2011, 02:23 PM   #2
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Re: 1993 Chevy S10 4x4 Pickup

I'm going to assume you have the electronic T-Case, even so i dont remember ever hearing of a separate PCM for the T-case. TCCM usualy, is Torque converter control module, in which case its normally built into the Main ECU box. The ECU is behind the Glove box, what problems are you having that your looking for this ?
Old 04-14-2011, 05:24 PM   #3
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Re: 1993 Chevy S10 4x4 Pickup

A couple people have told me that i have a transfer case control module or transfer case shift control module, i dont know which one but when i go to click my four wheel drive in all i hear is clicking and my motor trying to work and trying to put my truck into four wheel. i have replaced vacuum lines, actuator to shift hubs, canister, had my tcase pulled apart and looked at, new vacuum light indicator, and none of this had made it work yet
Old 04-15-2011, 12:05 AM   #4
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Re: 1993 Chevy S10 4x4 Pickup

Hmm, im at a loss here, not much experience with the electronic shift case. some one will chime in soon i should think , with better experience on the matter.
Old 04-24-2011, 10:48 PM   #5
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Re: 1993 Chevy S10 4x4 Pickup

post 1260, behind the passenger kick panel.

http://www.s10forum.com/forum/f221/project-1995-s10-sas-339311/
Old 04-28-2011, 03:09 PM   #6
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Re: 1993 Chevy S10 4x4 Pickup

Quote: Originally Posted by t01blaze
post 1260, behind the passenger kick panel.

http://www.s10forum.com/forum/f221/project-1995-s10-sas-339311/
that pic is of the ecm.

Colby123
your tccm is attached to the back side of the pcm along with the VSSB. you need to remove the pass side kick pannel to make room for the assembly to drop, once removed there will be a 9/32 bolt under the dash holding the ecm, tccm, and vssb assembly in. take that out and he whole thing will slide down from behind the g-box.

why do you want to replace it? are you having trouble with your transfer case not shifting?
Old 04-29-2011, 10:54 PM   #7
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Re: 1993 Chevy S10 4x4 Pickup

I've heard that unplugging it and letting it sit can cure the very problem you're having. Follow pjg's instructions to get to it.
Old 05-02-2011, 07:37 PM   #8
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Re: 1993 Chevy S10 4x4 Pickup

wow thanks. you are the first person that has replied on here that knows where its at and how to take it out. ya i cant get it to shift out of 2hi. i had my transfer case pulled apart at my buddies shop cause he knows what he is doing and he said it is all good, i have replaced everything except for the tccm and he told me that would probably be the case on this. I tried unplugging it and nothing happened, i was told to do that and had no luck
Old 05-03-2011, 08:36 AM   #9
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Re: 1993 Chevy S10 4x4 Pickup

i had the same problem when I bought mine. the np233 is a very moody tcase. the issue I was having was every time i pressed the 4wd button i would hear clicking under the dash the lights would flash and then stay in 2hi. didn't matter if i tried 4hi or 4lo. I ended up pulling the tranmission to rebuild it. when I put everything back in I used contact cleaner to clean all the connections to the encoder motor. I also removed the encoder motor and cleaned the mating surface of it and the tcase. once it was back together it worked. 4hi dosn't work sometimes but I hardly use it so no big loss there.
do you get the clicking under the dash when you press the switch? I also have to ask are you in neutral when trying to go to 4lo?
Old 05-03-2011, 08:00 PM   #10
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Re: 1993 Chevy S10 4x4 Pickup

Ya that is exactly what is happening with mine. I will push the button and all i hear is clicking under my dash and the light will be blink. Ya if i try and put it in 4lo i will be stopped but still nothing will happen. I have tried doing everything to it and i am running out of patience and dont feel like dumping more money into it
Old 05-03-2011, 10:59 PM   #11
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Re: 1993 Chevy S10 4x4 Pickup

All I ended up doing was cleaning my connections with contact cleaner and it started working and has been for the last 2 years. when it does crap out, I'll either put my spare 233 in or switch it to a 231 and ground the 4x4 signal wire to the computer on a micro switch. one thing to try is to remove your encoder motor but leave it plugged in and make sure it has a good ground. hit the swich and see if the encoder motor moves. if it moves there may be something keeping the range selector from moving smoothly. also check the wiring harness above the transmission near the bell housing for smashed wires. there is not much clearance in that location. if someone did a trans job or the motor was moved it could have pinched the wires.

when stopped trying to get into 4lo you do have it in neutral right.
Old 05-04-2011, 01:42 AM   #12
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Re: 1993 Chevy S10 4x4 Pickup

i had to put a rebuilt trans in it when i got it. but i made sure all wires were out of the way. i think i am gonna try cleaning the connections on it cause that could be what it is. do you recommend using a special connector cleaner? Yeah i have tried just about everything. i even bought a newer encoder motor, but i think maybe my wire connector could be what is dirty and its not getting a good enough connection.
Old 05-21-2011, 02:54 PM   #13
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Re: 1993 Chevy S10 4x4 Pickup

So i tried cleaning my connections with contact cleaner and i still have nothing.
Old 10-12-2011, 01:57 AM   #14
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Re: 1993 Chevy S10 4x4 Pickup

If you have the chevy s10 pick up it's under the passenger side kick panel. I just replaced mine so I know that's where it's at.
Old 11-12-2012, 07:25 PM   #15
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Re: 1993 Chevy S10 4x4 Pickup

my truck wont go into 4 wheel drive either have replaced the cannister once and it fixed the problem but seem to be getting oil or something in the canister any ideas where it may be coming from
Old 11-12-2012, 08:09 PM   #16
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Re: 1993 Chevy S10 4x4 Pickup

Quote: Originally Posted by jim37
my truck wont go into 4 wheel drive either have replaced the cannister once and it fixed the problem but seem to be getting oil or something in the canister any ideas where it may be coming from
If you have fluid in teh canister, then you need to replace your Vacuum switch on the Tcase, then go through and replace the hoses that have come in contact with the ATF.
Old 12-23-2012, 10:21 AM   #17
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Re: 1993 Chevy S10 4x4 Pickup

If the input seal on the Transfer case has hardend then the Transmission will pump transmission fluid into the transfer case causing it to become over full and push fluid into the vacuum system through the transfer case vacuum switch.
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