Diacom Comm. Prb's to a 92
Thread Starter
Drifting
Joined: Mar 1999
Posts: 1,931
Likes: 1
From: Norcross GA
Re: Diacom Comm. Prb's to a 92 (DOCTOR J)
All the indications I have gotten, tell me the Reg adapter should be the one to use.
I noticed the Reg adapter ties the SIR data to the Serial data line, for that car. That seems odd.
The PCM is not reporting any errors, but is operating in a fail mode. End result is, I'm not sure if it is a comm problem or a bad PCM.
I noticed the Reg adapter ties the SIR data to the Serial data line, for that car. That seems odd.
The PCM is not reporting any errors, but is operating in a fail mode. End result is, I'm not sure if it is a comm problem or a bad PCM.
Drifting
Joined: Mar 2001
Posts: 1,636
Likes: 3
From: Lafayette IN
Re: Diacom Comm. Prb's to a 92 (ZylaRace)
If it is fail hard mode (AKA limp-home) then I doubt you will be able to link. If it is fail soft (AKA fail soft, :lol: ) then you should probably be able to link.
This is just from experience with 85 and 91 though...when either system was in Limp, I could not link.
This is just from experience with 85 and 91 though...when either system was in Limp, I could not link.
Thread Starter
Drifting
Joined: Mar 1999
Posts: 1,931
Likes: 1
From: Norcross GA
Re: Diacom Comm. Prb's to a 92 (DOCTOR J)
I get ZERO support from Diacom. I always have. They are a worthless Co.
I do have what I consider the latest software. They have not changed it in years, and I got the lastest a few years ago.
Because the company is useless after the sale, I have scanned the users guide if anybody needs a copy. It turned out to be a pretty big file. More than 3 Meg worth.
The problem ECM does not appear to be in limp home mode., as there is no SES light. Yet the fans are on 100% of the time. This is one of its failure modes. A rather odd one, as it is responding to a failure, but it does not report a problem to the driver!!!! GM diag's say replace the ECM.
DocJ,
I've been looking for a disassembled copy of the code. Any idea if that is available? A commented version would be an incredible find.
I do have what I consider the latest software. They have not changed it in years, and I got the lastest a few years ago.
Because the company is useless after the sale, I have scanned the users guide if anybody needs a copy. It turned out to be a pretty big file. More than 3 Meg worth.
The problem ECM does not appear to be in limp home mode., as there is no SES light. Yet the fans are on 100% of the time. This is one of its failure modes. A rather odd one, as it is responding to a failure, but it does not report a problem to the driver!!!! GM diag's say replace the ECM.
DocJ,
I've been looking for a disassembled copy of the code. Any idea if that is available? A commented version would be an incredible find.
Thread Starter
Drifting
Joined: Mar 1999
Posts: 1,931
Likes: 1
From: Norcross GA
Re: Diacom Comm. Prb's to a 92 (DOCTOR J)
Doc,
Thanks, The ECM page shows the breakdown of the tables, but I don't see the commented code. Is there any?
Any idea if the 165 used the same 6803 processor? I'll venture a guess the 03 supports the full 6800 instruction set? I seem to recall someone posted that info, but I don't remember where it was posted. I beleive the 165, 727, 730 are all the same P4 design.
I have tried to find the TCat board before. I guess I'm blind, but I couldn't find it. I figured there would be a big fat link on their site but ???? I've been looking for ODB2 info from them.
Thanks, The ECM page shows the breakdown of the tables, but I don't see the commented code. Is there any?
Any idea if the 165 used the same 6803 processor? I'll venture a guess the 03 supports the full 6800 instruction set? I seem to recall someone posted that info, but I don't remember where it was posted. I beleive the 165, 727, 730 are all the same P4 design.
I have tried to find the TCat board before. I guess I'm blind, but I couldn't find it. I figured there would be a big fat link on their site but ???? I've been looking for ODB2 info from them.
Burning Brakes
Joined: May 1999
Posts: 760
Likes: 1
From: Greenwich, CT
Re: Diacom Comm. Prb's to a 92 (ZylaRace)
ZR,
On the ECMGuy site, under "tuning", there should a tab for "example hacks". The commented $8D hack is a pdf file of about half a meg (300 pp). I think it is also on the DIY EFI site. If you don't see it, send me an email & I can shoot you a copy.
On the TC site, follow the "links" tab to the "TC Mailing List" - you can browse the archive or subscribe from there.
I've not worked with any 165 ECMs directly. Ludis site shows them as a P4 (same as 727 & others), so I always assumed it was a 6811 processor but I don't know for sure. The EFI site probably has info on it.
HTH
29 Sept
PS - I could have sworn that somebody uploaded commented hack info the the DIY incoming site, but now I can't find it. Anybody seen any around besides what's on the ECMGuy site?
DrJ
On the ECMGuy site, under "tuning", there should a tab for "example hacks". The commented $8D hack is a pdf file of about half a meg (300 pp). I think it is also on the DIY EFI site. If you don't see it, send me an email & I can shoot you a copy.
On the TC site, follow the "links" tab to the "TC Mailing List" - you can browse the archive or subscribe from there.
I've not worked with any 165 ECMs directly. Ludis site shows them as a P4 (same as 727 & others), so I always assumed it was a 6811 processor but I don't know for sure. The EFI site probably has info on it.
HTH
29 Sept
PS - I could have sworn that somebody uploaded commented hack info the the DIY incoming site, but now I can't find it. Anybody seen any around besides what's on the ECMGuy site?
DrJ
Thread Starter
Drifting
Joined: Mar 1999
Posts: 1,931
Likes: 1
From: Norcross GA
Re: Diacom Comm. Prb's to a 92 (DOCTOR J)
I grabbed the stuff from the ECMGuy site.
It is enough to start with.
I think all the P4's were 8603 micro's. 165, 727, 730
I don't think the HC11 came into play until the ODB2, but I'm speculating. (I don't know what the 278 or the 333 uses.)
It is enough to start with.
I think all the P4's were 8603 micro's. 165, 727, 730
I don't think the HC11 came into play until the ODB2, but I'm speculating. (I don't know what the 278 or the 333 uses.)
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Burning Brakes
Joined: May 1999
Posts: 760
Likes: 1
From: Greenwich, CT
Re: Diacom Comm. Prb's to a 92 (ZylaRace)
I think all the P4's were 8603 micro's. 165, 727, 730
I don't think the HC11 came into play until the ODB2, but I'm speculating. (I don't know what the 278 or the 333 uses.)
I don't think the HC11 came into play until the ODB2, but I'm speculating. (I don't know what the 278 or the 333 uses.)
(ECM IC numbers are from Ludis' site - I never took mine that far apart.)
Thread Starter
Drifting
Joined: Mar 1999
Posts: 1,931
Likes: 1
From: Norcross GA
Re: Diacom Comm. Prb's to a 92 (DOCTOR J)
The conn issue turned out to be a laptop config issue.
An older Dell 3100 was used and the LPT was set for 0x0387 (or was it 0x3d7?) Normal. When this was done, the data came in fine.
First tried a Dell 8000 and 8100. This BIOS does not allow address selection. None of the protocals would work. (Normal, ECP, EPP, BiDir)
I don't know why, but this should have worked. It appears to be a protocal issue.
Either way, diag mode could be set. When it didn't work, there was no data being displayed, and errorenous trouble codes were reported.
An older Dell 3100 was used and the LPT was set for 0x0387 (or was it 0x3d7?) Normal. When this was done, the data came in fine.
First tried a Dell 8000 and 8100. This BIOS does not allow address selection. None of the protocals would work. (Normal, ECP, EPP, BiDir)
I don't know why, but this should have worked. It appears to be a protocal issue.
Either way, diag mode could be set. When it didn't work, there was no data being displayed, and errorenous trouble codes were reported.