DIY_EFI Digest Thursday, July 8 1999 Volume 04 : Number 402 In this issue: 1226870 ecm questions Thunder Bay EFI Hummer Parts (sorry, off subject) EFI system comparison Re: HELP, I erased the flash in my PCM See the end of the digest for information on subscribing to the DIY_EFI or DIY_EFI-Digest mailing lists. ---------------------------------------------------------------------- Date: Wed, 7 Jul 1999 15:09:33 EDT From: Mikepoore@xxx.com Subject: 1226870 ecm questions I am trying to link my laptop to the ecm datastream. I have learned that it is 160bps and that a 10k resistor between the A and B terminals will put the ecm into diagnostics mode. I would like to write a program that I would share with everyone to analyze oem systems in the field. If anyone can answer the following questions, I would greatly appreciate it: 1. What are the communications parameters, i.e. data bits, stop bits, parity, etc. 2. Does anyone know how to decode the data into useful information? 3. 160 bps is not a com port option on the menu. Can I just type it in and it work? 4. Is there a handshake that must occur when initializing communication, or do I just plug it in and start receiving? 5. I've seen Diacom advertised, but has anyone on the list has written anything that might be similar? Mike ------------------------------ Date: Wed, 7 Jul 1999 15:18:54 -0400 From: "C. Brooks" Subject: Thunder Bay EFI Has anyone ever heard of a company called "Thunder Bay"? Supposedly they deal in EFI hardware. I was given the name in passing by someone I met. Charles Brooks ------------------------------ Date: Wed, 7 Jul 1999 15:58:58 EDT From: EFISYSTEMS@xxx.com Subject: Hummer Parts (sorry, off subject) - --part1_272d25ee.24b50b82_boundary Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit In a message dated 7/7/99 12:56:13 PM Pacific Daylight Time, EFISYSTEMS writes: << Subj: Hummer Parts (sorry, off subject) Date: 7/7/99 12:56:13 PM Pacific Daylight Time From: EFISYSTEMS To: diy_efi@xxx.edu CC: gmecm@xxx.edu Hi People, I am trying to find a cross reference for part numbers that I have.....these are for army issue 89-90 hummers with the 6.2 diesel engine......I noticed some of the people on this list have hummers and would appreciate any response I get.....all the part numbers I have are from Mexico...ex 5740046......5740072....and approx 100 more...all descriptions I have are in spanish and aren't of much use.....anyone???? Thanks again, -Carl Summers >> - --part1_272d25ee.24b50b82_boundary Content-Type: message/rfc822 Content-Disposition: inline Return-path: EFISYSTEMS@xxx.com From: EFISYSTEMS@xxx.com Full-name: EFISYSTEMS Message-ID: <272d25ee.24b50add@xxx.com> Date: Wed, 7 Jul 1999 15:56:13 EDT Subject: Hummer Parts (sorry, off subject) To: diy_efi@xxx.edu CC: gmecm@xxx.edu MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Mailer: AOL 4.0 for Windows 95 sub 13 Hi People, I am trying to find a cross reference for part numbers that I have.....these are for army issue 89-90 hummers with the 6.2 diesel engine......I noticed some of the people on this list have hummers and would appreciate any response I get.....all the part numbers I have are from Mexico...ex 5740046......5740072....and approx 100 more...all descriptions I have are in spanish and aren't of much use.....anyone???? Thanks again, - -Carl Summers - --part1_272d25ee.24b50b82_boundary-- ------------------------------ Date: Wed, 7 Jul 1999 16:38:42 -0400 From: "C. Brooks" Subject: EFI system comparison OK, I just uploaded the comparison to the incoming directory. The file name is EFICOMP.rtf Sorry it took so long. Charles Brooks ------------------------------ Date: Wed, 7 Jul 1999 18:04:56 -0500 From: "Jennifer and Brock Fraser" Subject: Re: HELP, I erased the flash in my PCM > Dave Hempstead wrote: > > > What do you experts do when they try to reflash a PCM, and you get a = > > glitch, power failure, or some other error code. I doubt that you throw = > > it away. How do you recover the PCM??? > > I'm not sure who you're thinking of when you say expert, but at the > dealership level we would have to order a replacement pcm. GM loves > to warn against letting the pcm voltage drop while programming one. > For a tech, you're part would be declared DOA. > Shannen You see how the computer kinda has a wedge shape to it? Well, we used to call PCM's such as yours "wheel chocks" or "door stops". Don't mean to make fun of your unfortunate situation, but what can I say... better get out your [de]soldering station. BTW- This problem cost a company I used to work for a LOT of money until some problems were resolved... if that makes you feel any better. - -Brock ------------------------------ End of DIY_EFI Digest V4 #402 ***************************** To subscribe to DIY_EFI-Digest, send the command: subscribe diy_efi-digest in the body of a message to "Majordomo@xxx. A non-digest (direct mail) version of this list is also available; to subscribe to that instead, replace "diy_efi-digest" in the command above with "diy_efi".