16144288 TBI ECM upgrade to 16168625 TBI PCM

**dave w** · 03-23-2015

Originally Posted by 57 Handyman

Dave:

You are correct, my '92 S10 has an ESC which I found and verified the two wires--Dark Blue from KS and Black ESC to B7--which I need to join to make a direct connection from the single KS to the old B7. What function do the other two wires--Pink/Brown and Brown--connect to or serve?

One wire is ground, the other is ignition power (on / start). I don't remember which is which.

dave w

**57 Handyman** · 03-24-2015

Ok thanks Dave. For the time being, I will just leave the ESC connector and wires intact. Hopefully, there won't be too much of an impact as I continue with other restoration tasks, i.e., moving vehicle around the shop for painting and other activities, etc. Until I am done with the painting, there won't be any WOT which would fall into the KS and ESC domain.

Today, I fashioned a jumper wire to form a direct connection from the KS to B7. The motor fired and ran fine; as it idled, it didn't appear to be negatively impacted. I also identified my Digital Ratio Adapter Controller (DRAC) Module and, if needed, will make adjustments per documentation I found elsewhere on this site. In addition to the DRAC module, there was another "box" attached to my ECM. It is the one piggy-backed above the ECM. Does anyone recognize it and can tell me what it is and it's function.

Attachment 8753 Attachment 8754

You can see in the first picture the flags suggested by Dave W to aid in the repinning later on in the process.

**57 Handyman** · 03-24-2015

When I got home today, my red/blue pigtail had arrived in the mail. Hurray....but as I sit here examining it, I am wondering what is the actual pin out. Does anyone have details for this? Thanks in advance.

**PJG1173** · 03-31-2015

there is some good info in here maybe it should be moved out of the introduction area to where others may be looking at it.

**dave w** · 03-31-2015

Originally Posted by PJG1173

there is some good info in here maybe it should be moved out of the introduction area to where others may be looking at it.

I think that is a good idea, I'll try to move the thread later this evening. What should the title of the new thread be?

dave w

**57 Handyman** · 04-01-2015

Originally Posted by dave w

I think that is a good idea, I'll try to move the thread later this evening. What should the title of the new thread be?

dave w

Thanks Dave and pjg...how but simple and straight forward..."ECM 4288 to PCM 8625 Swap"?

Also, I posted the same pictures on the S10forum site and was told the gray box (piggy-back on my old ECM) is the Transfer Case Module.

**PJG1173** · 04-01-2015

It fairly straight forward a few subtle differences as noted earier. Silver box is the tccm. I wired the 8625 into my 87 Toyota with a 89 gm harnes and the factory by using the diagrams in the 7427 thread.