6395 7427 8625 Manual Trans Calibration Listing

There are a handful of calibrations specifically listed for manual transmissions with these pcm's. There are no 305 or 350 manual trans cals. Here is the breakdown:

Code:

---

PCM              4.3                7.4
6395            BJFD, BDXS        BHDB, BHDC,
                BHDD

7427            BJWT, BJXJ,        BMHJ, BMHK,
                BJWU              BMHL

8625            BDXW, BBMW, 
                AYXY, BAAK,
                BCPK, BCPL,
                BCPM, BDWZ,
                BDXA, BDXC,
                BDZA, BDYX

---

This list was compiled using the following transmission RPOs:
mg5, mt8, mw1, mw3, and my2. No additional truck manual transmission rpos are known for the vehicles which use these pcm's. If you have a specific manual trans RPO you'd like to have checked I'll be glad to do it.

What's strange is we know from other thread that 5.7L came with manual trans! But whenever I find a listing for manual trans it comes back to PCM that you did not include! 16156930

To further explain here is my post from that thread and theory...:

Quote:

---

BJYN in Cal Data shows 5.7L Manual 16197427 (superceded to BPSA and differant PCM 16156930) so I thing the BCC Lookup spread sheet is same database as CalData.

On BCCFind it says Trans Type= all/no listing just like the other one gregs78cam posted and he swears it came from an auto truck. CalData shows it to came from PCM 16156930 but it is in 16197427. So maybe GM did not had learned by then how to have a bin for both? By seeing 2 of these now I'd bet the 16156930 PCM is missing a few pieces needed for auto trans?

---

Manual transmission trucks with 5.0 / 5.7 came with a C3 ECM. There are three numbers, 16156480, 16196396 or 16171199.

BJYN is not a manual transmission calibration. BJYN is a G van calibration and G vans were not available with a manual transmission. The database has M for manual, A for auto, or sometimes it has nothing at all. GM's own software used to show "no listing" calibrations as "ALL" for transmission type but I worked in the dealership and I knew for a fact it was wrong sometimes. So when I wrote BCCFind I made sure it showed "All / No Listing" to indicate there was no specific data for trans type. The final check of course is to look at the cal in Tunerpro and see what options are selected. Greg reported the "manual trans" bit was not set on the trans he found which confirms auto trans.

16156930 PCM superceded to 16197427 with a brief time as a 16196395. GM did a flurrry of part number changes early on and IIRC they had a bulletin out regarding the changes. When there are a lot of quick changes like that I always suspected they'd found internal problems and worked them out during production or had a major vendor change and wanted to track the parts. But you did raise a good point. I need to go back through my search using the 6930 part number to see what comes up.

I just got back from Pull&Save and got two Manual Trans PCMs, one for V6 '7427 one for V6 '6395. Here they are.


EDIT: Mark you are right, that one did have a V6 in it, sorry. will repost .bin

Well aren't you cool? :thumbsup:

But CalData says BJFC is for 4.3 and BDXS was superceded to BJFC both 16196395 so the more we learn about manual BCC for these PCM the more I get confused?


EDIT: Hex says OD spark says six cylinder but manual transmission is checked! Woo Hoo! Should be able to use this with change to 8 cylinder and cylinder volume changed?

BCC result page!



BCC used in 1994. (Scroll down for more info)






BCC= BJFC7466

Scan id= 7465

Part number= 16197464



Release date= 01/31/94

Engine size= 4.3

Trans Type= Manual trans



ECM/PCM: PCM #16196395


Used in trucks:


GMC

Possibly used in:


C1500,2WD,1/2 TON

C1500,2WD,1/2 TON

C2500,2WD,3/4 TON








C2500,2WD,3/4 TON

K1500,4WD,1/2 TON

K1500,4WD,1/2 TON








K2500,4WD,3/4 TON

K2500,4WD,3/4 TON





Options:



With LB4 4.3L GAS (4.3Z) V6




With MT8 MAN 5 SPD NEW PROCESS 109MM 6.34




Without NM8 EMISSION SYSTEM, LEADED FUEL

Quote:

---

Originally Posted by 1project2many

Manual transmission trucks with 5.0 / 5.7 came with a C3 ECM. There are three numbers, 16156480, 16196396 or 16171199.

BJYN is not a manual transmission calibration. BJYN is a G van calibration and G vans were not available with a manual transmission. The database has M for manual, A for auto, or sometimes it has nothing at all. GM's own software used to show "no listing" calibrations as "ALL" for transmission type but I worked in the dealership and I knew for a fact it was wrong sometimes. So when I wrote BCCFind I made sure it showed "All / No Listing" to indicate there was no specific data for trans type. The final check of course is to look at the cal in Tunerpro and see what options are selected. Greg reported the "manual trans" bit was not set on the trans he found which confirms auto trans.

16156930 PCM superceded to 16197427 with a brief time as a 16196395. GM did a flurrry of part number changes early on and IIRC they had a bulletin out regarding the changes. When there are a lot of quick changes like that I always suspected they'd found internal problems and worked them out during production or had a major vendor change and wanted to track the parts. But you did raise a good point. I need to go back through my search using the 6930 part number to see what comes up.

---

What code mask did those manual trans ecm's use, $0D?

So your saying the manual trans truck started out with 16156480, 16196396, 16171199, or 16156930, and then switched to the 16196395, and then finally all (manual and auto) switched to using the 7427?

What I find interesting is that the "Stall Saver Activation Thresholds" bit is not set, and the "TCC Only" bit is set.

Yes they are both $OD.

But manual bit is set! May use something completly differant for Stall saver. Later when I find time..... been an issue lately.... I want to compare it to auto and see how many differences I can find to IAC logic, decel settings and such...

Manual bit is set so who knows what why TCC only is set, maybe over ride... who cares I got an $OD manual bin! :jfj:

I could always set it identical to $OE manual bin that needs changes from 7.4L to 5.7L, this one needs to go from 4.3L to 5.7L. The other one is listed as 5.7L all trans and it may be best start with manual bit checked?

Just remember to compare them both from V6s

Quote:

---

Originally Posted by EagleMark

Yes they are both $OD.

.... I want to compare it to auto and see how many differences I can find to IAC logic, decel settings and such...

---

Need to check for CPI as well.

So I've been having trouble getting my 1993 (8625) S10 with a 4.3 to run properly now that I've swapped a manual trans from a 92 into it. I got Tunerpro and an AutoProm, and have done a little digging, but haven't been able to get a bin that works properly. Everything seems to run okay in the short drives I've taken the truck on, but it doesn't like to idle down between shifts, and going downhill it will actually speed up. After coming to a stop for a couple seconds, it idles back down to 750 rpm, but not before. I have rebuilt the throttle body, and managed to get the e-fan coding working on my programmed chip, but there are way too many options in tunerpro that I don't understand. I'm hoping someone can give me some advice on where to look, or what to do. Thanks in advance!
~Phil

Philalbar1, I have '92 S-10 4x4 with slightly modified 4.3L and 700r4. I also run PCM 8625. When you say you got your e-fan coding working, do you mean shutting down your fans at highway speeds? I want to know exactly what you did to reprogram your chip to get the e-fan setup running. Would you mind sharing your BIN? Thanks in advance.

My e-fan setup consists of Intrepid fans and two relays. Fan #1 is tied to the AC and the relay is tapped into AC clutch GRN wire. Fan #2 is tied to engine temp and the relay tied to a engine temp sensor.

57, I got the code from the $E6 page that Mark put up, and just followed the instructions. I've got like 9 iterations of bins right now, as I'm trying to get my tune to work with a 5 speed conversion. The $E6 fan code was really pretty easy to work in, you just need to follow the instructions. I can put the hex code in now in about 40 minutes. It adds code to the end of the bin that will output grounds to specific wires coming from the ecm, and that is also included in the instructions.

http://www.gearhead-efi.com/Fuel-Inj...Information-E6 Post #7

That should include all the info you'll need. I can send you my bin that I am running in a private message, but it's kind of a mess right now and I really am skeptical about having other people try to run it as I may have messed up a lot of variables that could cause damage.

I can tell you, the Intrepid fans (at least the ones I got) run pretty strangely. I have setup both fans to cool the engine, not the trans since I'm running an NV3500. I ground the relay for "fan A" for low speed, and the ECM grounds the "fan B" relay, which actually turns both fans on high. Let me know if you need any more help. Have you started a post about this, so we don't clutter this post with fan info?

~Phil

MT8 with a V6??? That's the RPO for the NV4500 in 3/4 and 1 tons...