1994 4L60e showing no signs of life.

[usar17]

Theres a "command gear" value in tunerpro. But its stayed at 1

-Shawn
1985 Chevy k10 w/ 92 TBI, 94 4l60e, 91 NP208

 

[usar17]

The PCM shift based on what data? I can make sure thats all correct

-Shawn
1985 Chevy k10 w/ 92 TBI, 94 4l60e, 91 NP208

 

[usar17]

Bump

-Shawn
1985 Chevy k10 w/ 92 TBI, 94 4l60e, 91 NP208

 

[usar17]

SO....Speedo reads ZERO, but the ALDL data is showing a vehicle speed when i move. Thoughts? Could this be the cause. I first assumed it was the speedo bad, but could it be the VSS thus preventing upshift?

 

[Supercharged111]

Diagram shows the VSS feeding the VSS buffer which then feeds the ECM and instrument cluster separately so it seems to me if the ECM is getting a speed signal, it should be happy with it.

 

[usar17]

So its getting proper vss speed yet not commanding the upshift :/

-Shawn
1985 Chevy k10 w/ 92 TBI, 94 4l60e, 91 NP208

 

[Supercharged111]

How about TPS? Is it getting that? I still think it's weird your speedo isn't working. I'm guessing G it did before.

 

[usar17]

Ill double check the TPS but im pretty sure that was working properly. This is a total rebuild/restore Frankenstein truck lol the engine is the only thing i know works. So im testing components as i go. Any clue what to read to test my speedo?

-Shawn
1985 Chevy k10 w/ 92 TBI, 94 4l60e, 91 NP208

 

[Supercharged111]

Can you describe what all is mixed and matched? Your stock cable driven speedo won't work with an electronic VSS. I think the 87 trucks had a VSS that allowed the cable to be threaded into the ass end of it. Is the harness mixed and matched? How about that speedo box? I think it was called a DRAC. There's a good chance something isn't wired right, all this time I kept thinking it was just an R&R&R.

 

[usar17]

Ok. 1991 tbi motor, 1994 4L60e, all wiring is from a 1994 K1500, 1991 NP241c transfer case, 1991 K5 instrument (elect speedo)

-Shawn
1985 Chevy k10 w/ 92 TBI, 94 4l60e, 91 NP208