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ISO on C2 pin 19 information for a 2001 Chevy Silverado 1500 4x4

Roadstar01

By Roadstar01
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Roadstar01

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On 1/2/2025 at 2:43 PM, newdude said:

 

 

Here's the schematics for NVG246 Autotrac setup for 2001.  Two PDFs below, hopefully they open for you okay.  

 

TCASE POWER, GROUND AND SIGNALS.pdf 85.72 kB · 65 downloads

 

PCM DATA SHOWING TCASE LOW RANGE SIGNAL.pdf 93.68 kB · 55 downloads

TY for this information,  I have been chasing other rabbits and now with winter approaching back to getting this 4x4 worked out. I think you are onto something. I am going to connect to and use the front differential electric lock switch on the front differential from a donor S10 ZR2.  I will run one wire from the vacuum actuator relay to the front lock switch and the other from the lock switch to the PCM but still trying to be sure it is red C2 #16 or #19.  I had been looking at the 1695 circuit but I see you are thinking 1694 is the answer?  The NP246 transfer case and the TCCM is from a donor 2001 GMC Sierra. The front diff is from a donor 2003 Chevy S10 ZR2. What is happening is I hear the transfer case enter into 4WD and more noticeably into 4WD Low. Also the vacuum actuator sucks in and pulls the cable at the front differential. But, when I push the 4WD High or Low or Auto 4WD the Van's check/service AWD light light illuminates and no 4WD. So I missed the boat somewhere and I am thinking this is it.  Here is the latest example of chasing rabbits: right now the van is having an updated/improved rear differential work done on the weak 7.5 rear end. I am having an Eaton Truetrac Differential 912A317 and a replacement Motive Gear 4.10 because well it was bang up a bit when the stock differential came apart. Also updating cover by installing a Proform 66667 Perfect Launch aluminum differential cover with Bearing Cap Stabilizer bolts. I sure hope that these improvements make the 7.25" stand up better to be occasionally beat on.

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Roadstar01

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On 1/2/2025 at 8:54 AM, newdude said:

 

 

Which transfer case do you have?  Floor shift?  Push button with 2HI, 4HI and 4LO?  Or the Autotrac with AUTO mode?  

NP246 with TCCM donor from a 2001 GMC Sierra and a Front diff from a 2003 Chevy S10 ZR2 donor. Yes there is a Auto 4WD button but I am not holding my breath that it will ever work, i just have to get the $H and 4L to play nice with this swap

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