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1996 Chevrolet Tahoe 484

Tiny
CUPOFJOE84
  • MEMBER
  • 1996 CHEVROLET TAHOE
  • 5.7L
  • V8
  • 4WD
  • AUTOMATIC
  • 223,658 MILES
My 4wd stoped working, I replaced the transfer case motor still nothing, bench tested front accuator and that works fine also got another tccm. All the lights are on the 4wd selector 2wd 4 hi and 4 low. With one of the tccm the transfer case motor has power on both sides of the connector and with the other tccm it has ground on both sides. The front accuator has constant power with one and none with the other. I have looked at everything I can think of.
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Thursday, August 21st, 2014 AT 5:49 PM

7 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Wow, this sounds like an electrical nightmare. Have you checked all wiring? Also, do you have a scanner that can monitor the TCCM for operation and diagnostic issues?

Do you have a schematic of the wiring system? I have three schematics that I have tried to attach. I don't know if they will show up for you. If they don't, let me know wires, color of wires and questions you have and I will try to help.
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Thursday, August 21st, 2014 AT 6:19 PM
Tiny
CUPOFJOE84
  • MEMBER
  • 10 POSTS
No I do not have a scan tool that will read the tccm. Yes I have all wiring info. And yes this is a nightmare for me. Next thought was that it is a problem. In the computer but do not know for sure. Any help would be appreciated
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Thursday, August 21st, 2014 AT 6:30 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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I need you to get a scanner to help us. Otherwise, it becomes a guessing game. Something is telling me that the problem is in the TCCM. We need to be able to see how it is reacting.

Sorry about the pics. I had a feeling they wouldn't send.
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Thursday, August 21st, 2014 AT 6:37 PM
Tiny
CUPOFJOE84
  • MEMBER
  • 10 POSTS
That was going to be my next step. Will keep you posted on what I find out.
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Thursday, August 21st, 2014 AT 6:42 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
I look forward to hearing from you.
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Thursday, August 21st, 2014 AT 6:48 PM
Tiny
CUPOFJOE84
  • MEMBER
  • 10 POSTS
Have not yet had time to get a scanner hooked up yet but did a little more wire chasing and think I found the problem. At the team one wire for the transfer case motor had power and the other had ground. Well at the motor they both had ground. So going to rewire this and hopefully things will work.
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Monday, August 25th, 2014 AT 8:58 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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I agree. That sounds like the problem. Let me know if it gets fixed.
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Monday, August 25th, 2014 AT 6:36 PM

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