TZFBird

I started out by swaping to an 8746 ECM since it was a direct replacement. I then got the itch for something a little better so I picked up a 6395 out of a '94 S10 with a 4.3. I used a pinout from a 7427 which I assumed was the same but am a little unsure at this point.

Where I am at now is this:
*SES comes on and stays on when key is in run position before starting
*Fuel pump primes

I have yet to connect with it to see what is going on. I have tried WinALDL and FreeScan. I'm still trying to figure out TunerProRT but I don't think that does diagnostics.

What I am going to check:
*5V source to sensors so I can make sure that portion of the pinout/diagram is correct. I know that leaves a lot of room for error.

I have also looked through some S10 forums but that is still a WIP.

I'm mainly concerned with the SES staying on and not flashing. It stays on when A+B are jumpered but that does not mean the wiring is correct.

If all else fails I guess I'm buying a book with some sort of diagram in it(I know there are always some open books at Advance Auto).

Thoughts/suggestions?

ThEWhitebirD

iTrader: (1)

are you still using TBI? I also did this swap but got the pcm '7427 from a 95 5.7 tbi.. also got the red/blue connectors and moved the pins over.. went pretty smooth.

your using a 4.3 memcal? you may want to try getting a memcal chip from a v8 tbi.. how did you move the wires to the new connectors? I don't think the engine will run well if at all on a v6 chip. did you look at the sticky in the TBI section? "converting to a pcm" good info there. as far as Winaldl it wont work the newer pcm transmits data faster.. tunerpro does datalog, also datamaster but you have to pay for it.

TZFBird

That explains why that program doesn't do anything for me then.

As far as the Memcal... I unsoldered the PROM off the 4.3 Memcal, then modified the carrier until I could solder a ZIF socket in place of the PROM. It's all there and I ohmed out the ZIF connections but I may need to go over it again to make sure everything is good. So really out of the 4.3 Memcal I'm using the knock curcuit and the limp mode chips that are under it. If that is what those things are.

I'll revisit those stickys since it's been a few months. Maybe something will stand out in there. I'll check back here from time to time but I'll do a bit of reading first.

As far as wiring I knew there would be issues so I actually cut the wires and soldered in the pigtail for the 6395. So I have connectors for both ECMs. I can run either one (never both since pinouts are not the same).

TZFBird

Made a little progress that may have pointed me in the right direction. I tripple checked voltages from whatever can be checked in the "ON" position. Everything is fine except for the ESC signal from the module that is putting out around 9.5V which is what the old system used. Now the new stuff uses half that at close to 5V.

I'm going to see if I can get anything from a scanner at the local parts store. Maybe it's faulting and not starting because of the insane reading from ESC module?

ThEWhitebirD

iTrader: (1)

you mean the knock sensor signal that goes to the pcm? you don't use the ESC module under the hood anymore.. you need a knock sensor from a 94 truck or a resistor with the old one.. but 9.5v sounds funny... I thought the old ESC module used 12v power and the signal to the old ecm was 5v? maybe from the ESC module to the knock sensor was around 9 or 12? I don't remember..

TZFBird

I might be getting back to this now that some home repairs are finally nearing completion. So as soon as I read through all my old posts I can gather my train of thought and see if I can't get this ECM working.

Bear with me and maybe something will happen.

TZFBird

I thought about it for a few minutes last night and realized I used the wiring for a 7427 PCM. So I looked up the diagram for a 6395 and there are slight differences. I found at least 6 wires I need to check and make sure they are correct. Otherwise they could be what is throwing a code. Not to mention I know the wrong wire is going to the Serial Data port, so that could explain my no-connection issue as well.

I'll update when I get a change to crawl under the dash over the next few days.

TZFBird

I've got everything figured out now. I know I have spark. I have yet to be able to check fuel really. Hard to turn it over and watch injectors at the same time while flying solo.
But I'm trying to connect with TunerPro RT. Made up a cable that suposedly will support 8192 baud. I've downloaded just about every definition for scanning/etc. off the TunerPro site and nothing will connect. Does Moates offer anything?

The only other thing I can think of is that I screwed up something when assembling the board. I have yet to check it out but it's looking like that is my next step unless someone has some ideas as to why none of the scan definitions will work.

TZFBird

A few months later and nothing. I reverted back to TunerPro RT V.4 and it will attempt connecting and give me connection failed. Which may or may not be better than what I had before. My next stop is the Dyno to rule out the ECM as being the problem. If they can connect with it then I'm just down to my stuff being the issue. Gonna have to start paying to make progress I suppose.

Tuned Performance

iTrader: (92)

just curious why are you switching to the 16196395, you never indicated if you fixed the knock module and went with the $0D mask and proper memcal for a v8.

TZFBird

Bah, completely forgot about that... no I didn't. I'll see if I can get my hands on a factory V8 MEMCAL and go from there.
I figured I would be able to at least connect with the ECM without the correct knock control. I'm just trying to get to that point.

I havn't had the car out in quite a while and the LS 5.3 sitting in the corner keeps calling me since there's a NIB turbo for sale local that is more than capable of destroying anything I can afford.

I'll see where the MEMCAL takes me and go from there.

Tuned Performance

iTrader: (92)

http://www.ebay.com/itm/1993-95-GMC-...#ht_1836wt_877

Six_Shooter

iTrader: (2)

What bin did you program to the EPROM?

You need to use a matching ADS/ADX to the code (bin) you are using to connect.

You also need to set-up the com port properly.

--==EDIT==--

You may find some useful info here: http://www.gearhead-efi.com/Fuel-Inj...Information-OE