[Diy_efi] Re: J1850 PWM Info Request

[Gerhard Mueller]

Hello Rick Richard

you may want to get the ELM320 PIC from ElmElectronics.

Gerhard

Am 10-Feb-03 schrieb Rick Richard:
> I don't understand what the deal is.  I asked, I did not demand.
> I thought the purpose of a mailing list like this was to share information 
> and resources.  Perhaps you think it is presumptious of me to assume that 
> someone here has this information?  I don't think so, because I've read 
> archives of this list where people mention owning the SAE book with the 
> protocol information in it.
> 
> I don't understand the relevance of "having a real job." If you have the
> book, but don't have the time to share the info from it, then I understand.
> If someone has this info and is willing to share it, however, I'd rather do
> it that way than needlessly spend $80+ on a book that I would rather not
> buy.
> 
> All I want to do is make an open source PIC program to convert the J1850 PWM
> to a serial interface for use with one of the many scantool software
> packages out there. VPW Is very well documented but few people seem to care
> about the ford PWM and the DIY kits that are out there for it are
> closed-source.
> 
> 
> 
>> From: Mike <erazmus at iinet.net.au>
>> Reply-To: List for general do-it-yourself EFI talk <diy_efi at diy-efi.org>
>> To: List for general do-it-yourself EFI talk <diy_efi at diy-efi.org>
>> Subject: Re: [Diy_efi] J1850 PWM Info Request
>> Date: Mon, 10 Feb 2003 12:49:45
>> 
>> Presumptive, or mildy impertinent I would have thought ;-)
>> 
>> We aint a free library service, some of us have real jobs where
>> people pay $200 an hour (on those rare occasions :)
>> 
>> rgds
>> 
>> mike
>> 
>> 
>> At 08:42 PM 9/2/2003 -0800, you wrote:
>>> Rick,
>>> 
>>> Your approach at asking for information is a *little* coarse.  I don't 
>> have
>>> any of the SAE books, but I can recommend a good book that has all of the
>>> Ford diag codes listed and a little bit of info.
>>> 
>>> My suggestions are these:
>>> 
>>> Get "Ford Tuning" by Ivan J. Kotzig.  He's the founder of Diablosport.  
>> The
>>> book is a little lite on tech stuff, but it does have little bits of 
>> jewels.
>>> On page 108 they describe some of the logical protocol used for the PWM.
>> They
>>> also describe the PWM encoding itself.  This is a good starting point and
>>> reference.
>>> 
>>> My next suggestion is to by an AutoXray and tap into the Data+ line for
>> the PWM.
>>> Use a logic analyzer or a circuit of your own design to sniff the data 
>> off
>>> the bus.  You should be able to get a fairly complete working example 
>> using
>>> this method.
>>> 
>>> The rest is up to you.  There is a Yahoo group for an open OBDII comm
>> interface,
>>> but it implements the SAE proto and not the PWM.
>>> 
>>> --Perry
>>> 
>>> On Sun, Feb 09, 2003 at 07:42:58PM -0800, Rick Richard wrote:
>>>> I know someone on this list as either the SAE J1850 standard or the SAE
>>>> HS-3000 book.  I'd like to implement the J1850 PWM protocol that Ford
>> uses,
>>>> but I can't find the protocol specs online, the books are expensive, 
>> and
>> the
>>>> custom chips are closed-source.
>>>> 
>>>> Would someone scan the info out of their book(s) and email them to me?
>>>> It would be greatly appreciated!
>>>> -Rick
>>> 
>>> --
>>> Perry Harrington            Data Acquisition & Instrumentation, Inc
>>> perry at dainst dot com                     http://www.dainst.com/
>>> 
>>> Those who would give up essential liberty to purchase a little temporary
>> safety
>>> deserve neither liberty or safety. Nor, are they likely to end up with
>> either.
>>>                             -- Benjamin Franklin
>>> 
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>>> Diy_efi at diy-efi.org
>>> http://www.diy-efi.org/mailman/listinfo/diy_efi
>>> 
>>> 
>> 
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