GEN IV DBW TB on GEN 3?
 

Does anyone know how to get a 87mm to 90mm DBW throttle body to work on a GEN 3 system? I have the old LS1 corvette style DBW and can not figure out how to get my gen IV 6 pin throttle body to work. It functions in reverse only. I turn the ign on and the throttle body opens all the way up. As I push the pedal in it closes... I swapped the TAC motor wires and no luck.

you need an x link if I believe. Torque Rush LS2, LS7, LS3 to LS1 throttle body adapter harness

Speartech has a ETC throttle body harness adapter if coming from a 97-04 Corvette three-bolt throttle body and going to the larger 90mm LS2 style 4-bolt throttle body that costs about 60 bucks. And for those that are wondering, you don’t run into the throttle blade only partially opening like you do when replacing the ’03 and up truck style ETC throttle bodies with the 90mm car units.

They also have a harness that is similar for folks that have the earlier style '01-'02 truck ETC thottle-body that wants/needs to move up to the larger LS2 style 90mm unit.

Yea I copied the pinouts and my my own harness. No luck. Im soooo close though. It just functions in reverse. X link will not work with my DBW.

I checked my pcm. It's a 2000 Yukon and I only see DBw for 01-02? I'm trying to find a 2002 OS DBw and reflash to that.

So so so so frustrated. Got rid of the 2007 truck throttle body and got a LS2 gto throttle body. Hooked it up and EXACT SAME PROBLEM. Turn the key on it goes to wot. Push the pedal down and it closes!!! I swapped the TAC wires on the motor and it wont work at. Im going to have to give up and just convert it to DBC.

Are the PCM, pedal and TAC module all out of the same vehicle? What wire colors are in your harness to the TB?

Well I got it going. I swapped TAC motor wires and the low ref and 5 volt ref wires. So swapping all 4 wires got the job done. I read swapping the ground and 5 ref would burn up the pcm but it worked for me.