[Diy_efi] J1850 PWM Info Request

[Mike]

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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