What did you do to your NNBS GMT900 Tahoe/Yukon Today?

[Doubeleive]

Well.... Then you will probably have to get under there with a meter and start testing for power ground, ohms. You will probably need a diagram to reference and values expected for each pin

 

[Charlie207]

For the grounds.... How many are there for the engine bay?

One at the back of the driver's-side cylinder head.

One on the bottom of the block, behind the PS pump.

One on the front of the passenger's side cylinder head.

Anywhere else?

 

[j91z28d1]

if the abs module is under the truck around the drivers seat area on normal ones, there's a ground hidden down there for it somewhere too

 

[Charlie207]

While digging around for loose wires and other dumb stuff I ripped out the smoked front diff. and slammed in the replacement.

I drained the old fluid from the replacement before bench-pressing it up into position - every ounce counts - and was happy to see that it was fairly clean & no sparkles in sight.

Filled it up with synthetic Lucas fluid. I'll throw in the front CVs some other time. I need a beer.

I'll see if anyone wants to buy the bad one as a core for a rebuild. Does $50-75 seem like a fair price to ask?

 

[Charlie207]

Plugged the AutoCal V3 in to pull the codes:

 

[j91z28d1]

I feel like you might need a month description to all data for this one. that's a lot of stuff

 

[j91z28d1]

wired in a toggle switch inline with my hood adjar switch so I can tell the ecm the hood is open when it's not without setting a fault code.


seemed to work on the first test drive.

 

[kbuskill]

wired in a toggle switch inline with my hood adjar switch so I can tell the ecm the hood is open when it's not without setting a fault code.


seemed to work on the first test drive.

Ok, I will take the bait... why?

 

[Doubeleive]

View attachment 436147Plugged the AutoCal V3 in to pull the codes:
View attachment 436148

 

[Charlie207]

Looks like (after a cursory glance) all the U-codes are related to modules not talking.

I love how there were were zero issues before the motor swap..... Such is life.